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CVSS: -EPSS: 0%CPEs: 4EXPL: 0

CVE-2021-47597 – inet_diag: fix kernel-infoleak for UDP sockets

https://notcve.org/view.php?id=CVE-2021-47597

In the Linux kernel, the following vulnerability has been resolved: inet_diag: fix kernel-infoleak for UDP sockets KMSAN reported a kernel-infoleak [1], that can exploited by unpriv users. After analysis it turned out UDP was not initializing r->idiag_expires. Other users of inet_sk_diag_fill() might make the same mistake in the future, so fix this in inet_sk_diag_fill(). [1] BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:156 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 instrument_copy_to_user include/linux/instrumented.h:121 [inline] copyout lib/iov_iter.c:156 [inline] _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 copy_to_iter include/linux/uio.h:155 [inline] simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519 __skb_datagram_iter+0x2cb/0x1280 net/core/datagram.c:425 skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3657 [inline] netlink_recvmsg+0x660/0x1c60 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:944 [inline] sock_recvmsg net/socket.c:962 [inline] sock_read_iter+0x5a9/0x630 net/socket.c:1035 call_read_iter include/linux/fs.h:2156 [inline] new_sync_read fs/read_write.c:400 [inline] vfs_read+0x1631/0x1980 fs/read_write.c:481 ksys_read+0x28c/0x520 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0xdb/0x120 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [inline] netlink_dump+0x3d5/0x16a0 net/netlink/af_netlink.c:2245 __netlink_dump_start+0xd1c/0xee0 net/netlink/af_netlink.c:2370 netlink_dump_start include/linux/netlink.h:254 [inline] inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1343 sock_diag_rcv_msg+0x24a/0x620 netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2491 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:276 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x1095/0x1360 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x16f3/0x1870 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] sock_write_iter+0x594/0x690 net/socket.c:1057 do_iter_readv_writev+0xa7f/0xc70 do_iter_write+0x52c/0x1500 fs/read_write.c:851 vfs_writev fs/read_write.c:924 [inline] do_writev+0x63f/0xe30 fs/read_write.c:967 __do_sys_writev fs/read_write.c:1040 [inline] __se_sys_writev fs/read_write.c:1037 [inline] __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Bytes 68-71 of 312 are uninitialized Memory access of size 312 starts at ffff88812ab54000 Data copied to user address 0000000020001440 CPU: 1 PID: 6365 Comm: syz-executor801 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 En el kernel de Linux, se resolvió la siguiente vulnerabilidad: inet_diag: corrige la fuga de información del kernel para sockets UDP KMSAN informó una fuga de información del kernel [1], que puede ser explotada por usuarios sin privilegios. Después del análisis resultó que UDP no estaba inicializando r->idiag_expires. Otros usuarios de inet_sk_diag_fill() podrían cometer el mismo error en el futuro, así que solucione este problema en inet_sk_diag_fill(). [1] ERROR: KMSAN: kernel-infoleak en instrument_copy_to_user include/linux/instrumented.h:121 [en línea] ERROR: KMSAN: kernel-infoleak en copia lib/iov_iter.c:156 [en línea] ERROR: KMSAN: kernel-infoleak en _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 instrument_copy_to_user include/linux/instrumented.h:121 [en línea] copia lib/iov_iter.c:156 [en línea] _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 copy_to_iter include/linux/uio.h:155 [en línea] simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519 __skb_datagram_iter+0x2cb/0x1280 net/core/datagram.c:425 skb_copy_datagram_iter+0xdc/0x270 net/core/datagram .c:533 skb_copy_datagram_msg include/linux/skbuff.h:3657 [en línea] netlink_recvmsg+0x660/0x1c60 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:944 [en línea] sock_recvmsg net/socket.c:962 [en línea] sock_read_iter+0x5a9/0x630 net/socket.c:1035 call_read_iter include/linux/fs.h:2156 [en línea] new_sync_read fs/read_write.c:400 [en línea] vfs_read+0x1631/0x1980 fs/read_write.c: 481 ksys_read+0x28c/0x520 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [en línea] __se_sys_read fs/read_write.c:627 [en línea] __x64_sys_read+0xdb/0x120 fs/read_write.c:627 _arco x64/ x86/entry/common.c:51 [en línea] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 Entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit se creó en: slab_post_alloc_hook mm/slab.h:524 [en línea] slab_alloc_node mm/slub.c:3251 [en línea] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [en línea] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [en línea] netlink_dump+0x3d5/0x16a0 net/netlink/af_netlink.c:2245 __netlink_dump_start+0xd1c/0xee0 net/netlink/af_netlink.c:2370 netlink_dump_start include/linux/netlink.h:254 [en línea] inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1343 sock_diag_rcv_msg+0x24a/0x620 netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2491 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:276 netlink_unicast_kernel net/netlink/af_netlink.c: 1319 [en línea] netlink_unicast+0x1095/0x1360 netLink/af_netlink.c: 1345 netlink_sendmsg+0x16f3/0x1870 net/netlink/af_etlink.c: 1916 sockm. C: 704 [ en línea] sock_sendmsg net/socket.c:724 [en línea] sock_write_iter+0x594/0x690 net/socket.c:1057 do_iter_readv_writev+0xa7f/0xc70 do_iter_write+0x52c/0x1500 fs/read_write.c:851 vfs_writev fs/read_write.c:9 24 [en línea] do_writev+0x63f/0xe30 fs/read_write.c:967 __do_sys_writev fs/read_write.c:1040 [en línea] __se_sys_writev fs/read_write.c:1037 [en línea] __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037 _syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 Entry_SYSCALL_64_after_hwframe+0x44/0xae Los bytes 68-71 de 312 no están inicializados El acceso a la memoria de tamaño 312 comienza en ffff88812ab54000 Datos copiados a la dirección de usuario 0000000020001440 CPU: 1 PID: 6365 Comm: syz-executor801 Not tainted 5.16.0-rc3-syzkaller #0 Nombre de hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 • https://git.kernel.org/stable/c/3c4d05c8056724aff3abc20650807dd828fded54 https://git.kernel.org/stable/c/7b5596e531253ce84213d9daa7120b71c9d83198 https://git.kernel.org/stable/c/3a4f6dba1eb98101abc012ef968a8b10dac1ce50 https://git.kernel.org/stable/c/e5d28205bf1de7082d904ed277ceb2db2879e302 https://git.kernel.org/stable/c/71ddeac8cd1d217744a0e060ff520e147c9328d1 •

CVSS: 7.3EPSS: 0%CPEs: 3EXPL: 0

CVE-2021-47596 – net: hns3: fix use-after-free bug in hclgevf_send_mbx_msg

https://notcve.org/view.php?id=CVE-2021-47596

In the Linux kernel, the following vulnerability has been resolved: net: hns3: fix use-after-free bug in hclgevf_send_mbx_msg Currently, the hns3_remove function firstly uninstall client instance, and then uninstall acceletion engine device. The netdevice is freed in client instance uninstall process, but acceletion engine device uninstall process still use it to trace runtime information. This causes a use after free problem. So fixes it by check the instance register state to avoid use after free. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net: hns3: corrige el error de use-after-free en hclgevf_send_mbx_msg Actualmente, la función hns3_remove desinstala primero la instancia del cliente y luego desinstala el dispositivo del motor de aceleración. El dispositivo de red se libera en el proceso de desinstalación de la instancia del cliente, pero el proceso de desinstalación del dispositivo del motor de aceleración aún lo utiliza para rastrear la información del tiempo de ejecución. • https://git.kernel.org/stable/c/d8355240cf8fb8b9e002b5c8458578435cea85c2 https://git.kernel.org/stable/c/12512bc8f25b8ba9795dfbae0e9ca57ff13fd542 https://git.kernel.org/stable/c/4f4a353f6fe033807cd026a5de81c67469ff19b0 https://git.kernel.org/stable/c/27cbf64a766e86f068ce6214f04c00ceb4db1af4 https://access.redhat.com/security/cve/CVE-2021-47596 https://bugzilla.redhat.com/show_bug.cgi?id=2293230 • CWE-416: Use After Free •

CVSS: -EPSS: 0%CPEs: 2EXPL: 0

CVE-2021-47595 – net/sched: sch_ets: don't remove idle classes from the round-robin list

https://notcve.org/view.php?id=CVE-2021-47595

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_ets: don't remove idle classes from the round-robin list Shuang reported that the following script: 1) tc qdisc add dev ddd0 handle 10: parent 1: ets bands 8 strict 4 priomap 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 2) mausezahn ddd0 -A 10.10.10.1 -B 10.10.10.2 -c 0 -a own -b 00:c1:a0:c1:a0:00 -t udp & 3) tc qdisc change dev ddd0 handle 10: ets bands 4 strict 2 quanta 2500 2500 priomap 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 crashes systematically when line 2) is commented: list_del corruption, ffff8e028404bd30->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:47! invalid opcode: 0000 [#1] PREEMPT SMP NOPTI CPU: 0 PID: 954 Comm: tc Not tainted 5.16.0-rc4+ #478 Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014 RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47 Code: fe ff 0f 0b 48 89 c1 4c 89 c6 48 c7 c7 08 42 1b 87 e8 1d c5 fe ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 98 42 1b 87 e8 09 c5 fe ff <0f> 0b 48 c7 c7 48 43 1b 87 e8 fb c4 fe ff 0f 0b 48 89 f2 48 89 fe RSP: 0018:ffffae46807a3888 EFLAGS: 00010246 RAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202 RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff R10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800 R13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400 FS: 00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000682f48 CR3: 00000001058be000 CR4: 0000000000350ef0 Call Trace: <TASK> ets_qdisc_change+0x58b/0xa70 [sch_ets] tc_modify_qdisc+0x323/0x880 rtnetlink_rcv_msg+0x169/0x4a0 netlink_rcv_skb+0x50/0x100 netlink_unicast+0x1a5/0x280 netlink_sendmsg+0x257/0x4d0 sock_sendmsg+0x5b/0x60 ____sys_sendmsg+0x1f2/0x260 ___sys_sendmsg+0x7c/0xc0 __sys_sendmsg+0x57/0xa0 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7efdc8031338 Code: 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 8d 05 25 43 2c 00 8b 00 85 c0 75 17 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 41 54 41 89 d4 55 RSP: 002b:00007ffdf1ce9828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000061b37a97 RCX: 00007efdc8031338 RDX: 0000000000000000 RSI: 00007ffdf1ce9890 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000078a940 R10: 000000000000000c R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000688880 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: sch_ets sch_tbf dummy rfkill iTCO_wdt iTCO_vendor_support intel_rapl_msr intel_rapl_common joydev pcspkr i2c_i801 virtio_balloon i2c_smbus lpc_ich ip_tables xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel serio_raw ghash_clmulni_intel ahci libahci libata virtio_blk virtio_console virtio_net net_failover failover sunrpc dm_mirror dm_region_hash dm_log dm_mod [last unloaded: sch_ets] ---[ end trace f35878d1912655c2 ]--- RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47 Code: fe ff 0f 0b 48 89 c1 4c 89 c6 48 c7 c7 08 42 1b 87 e8 1d c5 fe ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 98 42 1b 87 e8 09 c5 fe ff <0f> 0b 48 c7 c7 48 43 1b 87 e8 fb c4 fe ff 0f 0b 48 89 f2 48 89 fe RSP: 0018:ffffae46807a3888 EFLAGS: 00010246 RAX: 000000000000004e RBX: 0000000000000007 RCX: 0000000000000202 RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff R10: 0000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800 R13: ffff8e028404bd30 R14: dead000000000100 R15: ffff8e02fafa2400 FS: 00007efdc92e4480(0000) GS:ffff8e02fb600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000 ---truncated--- En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net/sched: sch_ets: no elimine las clases inactivas de la lista de turnos Shuang informó que el siguiente script: 1) tc qdisc add dev ddd0 handle 10: parent 1: ets bandas 8 estricto 4 priomap 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 2) mausezahn ddd0 -A 10.10.10.1 -B 10.10.10.2 -c 0 -a propio -b 00:c1:a0: c1:a0:00 -t udp &amp; 3) tc qdisc change dev ddd0 handle 10: ets bands 4 estricto 2 cuantos 2500 2500 priomap 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 falla sistemáticamente cuando la línea 2) se comenta: corrupción list_del, ffff8e028404bd30-&gt;el siguiente es LIST_POISON1 (dead000000000100) ------------[ cortar aquí ]------------ ERROR del kernel en lib/list_debug. c:47! código de operación no válido: 0000 [#1] PREEMPT SMP NOPTI CPU: 0 PID: 954 Comunicaciones: tc Not tainted 5.16.0-rc4+ #478 Nombre de hardware: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066 +0f1aadab 01/04/2014 RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47 Código: fe ff 0f 0b 48 89 c1 4c 89 c6 48 c7 c7 08 42 1b 87 e8 1d c5 fe ff 0f 0b 48 89 fe 4 8 89 c2 48 c7 c7 98 42 1b 87 e8 09 c5 fe ff &lt;0f&gt; 0b 48 c7 c7 48 43 1b 87 e8 fb c4 fe ff 0f 0b 48 89 f2 48 89 fe RSP: 0018:ffffae46807a3888 EFLAGS: 246 RAX: 000000000000004eRBX : 0000000000000007 RCX: 0000000000000202 RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff RBP: ffffae46807a3a10 R08: 00000000000 00000 R09: c0000000ffff7fff R10: 00000000000000001 R11: ffffae46807a36a8 R12: ffff8e028404b800 R13: ffff8e028404bd30 R14: dead000000000100 R15: e02fafa2400 FS: 00007efdc92e4480(0000) GS:ffff8e02fb600000 (0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000682f48 CR3: 00000001058be000 CR4: 000000000035 0ef0 Seguimiento de llamadas: ets_qdisc_change+0x58b/0xa70 [sch_ets] tc_modify_qdisc+0x323/0x880 rtnetlink_rcv_msg+0x169/ 0x4a0 netlink_rcv_skb+0x50/0x100 netlink_unicast+0x1a5/0x280 netlink_sendmsg+0x257/0x4d0 sock_sendmsg+0x5b/0x60 ____sys_sendmsg+0x1f2/0x260 ___sys_sendmsg+0x7c/0xc0 __sys_sendmsg+0x57/0xa0 do_syscall_64+0x3a/0x80 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033: 0x7efdc8031338 Código: 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 8d 05 25 43 2c 00 8b 00 85 c0 75 17 b8 2e 00 00 0f 05 &lt;48&gt; 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 41 54 41 89 d4 55 RSP: 002b:00007ffdf1ce9828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: de RBX: 0000000061b37a97 RCX: 00007efdc8031338 RDX: 0000000000000000 RSI: 00007ffdf1ce9890 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000078a940 R10: 000000000000000c R11: 00000000000000246 R12: 0000000000000001 R 13: 0000000000688880 R14: 0000000000000000 R15: 0000000000000000 Módulos vinculados en: sch_ets sch_tbf dummy rfkill iTCO_wdt iTCO_vendor_support intel_rapl_msr intel_rapl_common pcs pkr i2c_i801 virtio_balloon i2c_smbus lpc_ich ip_tables xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel serio_raw ghash_clmulni_intel ahci libahci libata virtio_blk virtio_console virtio_net net_failover failover sunrpc dm_mirror dm_region_hash dm_log dm_mod [última descarga: sch_ets] ---[ fin de seguimiento f35878d191 2655c2 ]--- RIP: 0010:__list_del_entry_valid.cold.1+0x12/0x47 Código: fe ff 0f 0b 48 89 c1 4c 89 c6 48 c7 c7 08 42 1b 87 e8 1d c5 fe ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 98 42 1b 87 e8 09 c5 fe ff &lt;0f&gt; 0b 48 c7 c7 48 43 1b 87 e8 fb c4 fe ff 0f 0b 48 89 f2 48 89 fe RSP: 0018:ffffae46807a3888 EFLAGS: 00010246 RAX: 000000000000004e RBX: 0000000000000007 RCX 000 0000000000202 RDX: 0000000000000000 RSI: ffffffff871ac536 RDI: 00000000ffffffff RBP: ffffae46807a3a10 R08: 0000000000000000 R09: c0000000ffff7fff R10: 0000000000000001 R11: FFFFFAE46807A36A8 R12: FFFFF8E028404B800 R13: FFFF8E028404BD30 R14: Dead000000000100 R15: FFFFF8E02FAFA2400 FUT: GS: FFFF8E02FB600000 (0000) KNLGS: 000000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000 - --truncado--- • https://git.kernel.org/stable/c/ae2659d2c670252759ee9c823c4e039c0e05a6f2 https://git.kernel.org/stable/c/e25bdbc7e951ae5728fee1f4c09485df113d013c https://git.kernel.org/stable/c/81fbdd45652d8605a029e78ef14a6aaa529c4e72 https://git.kernel.org/stable/c/491c1253441e2fdc8f6a6f4976e3f13440419b7a https://git.kernel.org/stable/c/c062f2a0b04d86c5b8c9d973bea43493eaca3d32 •

CVSS: -EPSS: 0%CPEs: 3EXPL: 0

CVE-2021-47593 – mptcp: clear 'kern' flag from fallback sockets

https://notcve.org/view.php?id=CVE-2021-47593

In the Linux kernel, the following vulnerability has been resolved: mptcp: clear 'kern' flag from fallback sockets The mptcp ULP extension relies on sk->sk_sock_kern being set correctly: It prevents setsockopt(fd, IPPROTO_TCP, TCP_ULP, "mptcp", 6); from working for plain tcp sockets (any userspace-exposed socket). But in case of fallback, accept() can return a plain tcp sk. In such case, sk is still tagged as 'kernel' and setsockopt will work. This will crash the kernel, The subflow extension has a NULL ctx->conn mptcp socket: BUG: KASAN: null-ptr-deref in subflow_data_ready+0x181/0x2b0 Call Trace: tcp_data_ready+0xf8/0x370 [..] En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: borrar el indicador 'kern' de los sockets de reserva La extensión mptcp ULP depende de que sk-&gt;sk_sock_kern esté configurado correctamente: impide que setsockopt(fd, IPPROTO_TCP, TCP_ULP, "mptcp", 6); de funcionar para sockets tcp simples (cualquier socket expuesto al espacio de usuario). Pero en caso de respaldo, aceptar() puede devolver un sk tcp simple. En tal caso, sk todavía está etiquetado como 'kernel' y setsockopt funcionará. Esto bloqueará el kernel. • https://git.kernel.org/stable/c/cf7da0d66cc1a2a19fc5930bb746ffbb2d4cd1be https://git.kernel.org/stable/c/451f1eded7f56e93aaf52eb547ba97742d9c0e97 https://git.kernel.org/stable/c/c26ac0ea3a91c210cf90452e625dc441adf3e549 https://git.kernel.org/stable/c/d6692b3b97bdc165d150f4c1505751a323a80717 •

CVSS: -EPSS: 0%CPEs: 8EXPL: 0

CVE-2021-47589 – igbvf: fix double free in `igbvf_probe`

https://notcve.org/view.php?id=CVE-2021-47589

In the Linux kernel, the following vulnerability has been resolved: igbvf: fix double free in `igbvf_probe` In `igbvf_probe`, if register_netdev() fails, the program will go to label err_hw_init, and then to label err_ioremap. In free_netdev() which is just below label err_ioremap, there is `list_for_each_entry_safe` and `netif_napi_del` which aims to delete all entries in `dev->napi_list`. The program has added an entry `adapter->rx_ring->napi` which is added by `netif_napi_add` in igbvf_alloc_queues(). However, adapter->rx_ring has been freed below label err_hw_init. So this a UAF. In terms of how to patch the problem, we can refer to igbvf_remove() and delete the entry before `adapter->rx_ring`. The KASAN logs are as follows: [ 35.126075] BUG: KASAN: use-after-free in free_netdev+0x1fd/0x450 [ 35.127170] Read of size 8 at addr ffff88810126d990 by task modprobe/366 [ 35.128360] [ 35.128643] CPU: 1 PID: 366 Comm: modprobe Not tainted 5.15.0-rc2+ #14 [ 35.129789] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 35.131749] Call Trace: [ 35.132199] dump_stack_lvl+0x59/0x7b [ 35.132865] print_address_description+0x7c/0x3b0 [ 35.133707] ? free_netdev+0x1fd/0x450 [ 35.134378] __kasan_report+0x160/0x1c0 [ 35.135063] ? • https://git.kernel.org/stable/c/d4e0fe01a38a073568aee541a0247fe734095979 https://git.kernel.org/stable/c/ffe1695b678729edec04037e691007900a2b2beb https://git.kernel.org/stable/c/79d9b092035dcdbe636b70433149df9cc6db1e49 https://git.kernel.org/stable/c/8d0c927a9fb2b4065230936b77b54f857a3754fc https://git.kernel.org/stable/c/cc9b655bb84f1be283293dfea94dff9a31b106ac https://git.kernel.org/stable/c/8addba6cab94ce01686ea2e80ed1530f9dc33a9a https://git.kernel.org/stable/c/74a16e062b23332d8db017ff4a41e16279c44411 https://git.kernel.org/stable/c/944b8be08131f5faf2cd2440aa1c24a39 •