CVSS: 5.5EPSS: 0%CPEs: 6EXPL: 0CVE-2024-26676 – af_unix: Call kfree_skb() for dead unix_(sk)->oob_skb in GC.
https://notcve.org/view.php?id=CVE-2024-26676
In the Linux kernel, the following vulnerability has been resolved: af_unix: Call kfree_skb() for dead unix_(sk)->oob_skb in GC. syzbot reported a warning [0] in __unix_gc() with a repro, which creates a socketpair and sends one socket's fd to itself using the peer. socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0 sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\360", iov_len=1}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, MSG_OOB|MSG_PROBE|MSG_DONTWAIT|MSG_ZEROCOPY) = 1 This forms a self-cyclic reference that GC should finally untangle but does not due to lack of MSG_OOB handling, resulting in memory leak. Recently, commit 11498715f266 ("af_unix: Remove io_uring code for GC.") removed io_uring's dead code in GC and revealed the problem. The code was executed at the final stage of GC and unconditionally moved all GC candidates from gc_candidates to gc_inflight_list. That papered over the reported problem by always making the following WARN_ON_ONCE(!list_empty(&gc_candidates)) false. The problem has been there since commit 2aab4b969002 ("af_unix: fix struct pid leaks in OOB support") added full scm support for MSG_OOB while fixing another bug. To fix this problem, we must call kfree_skb() for unix_sk(sk)->oob_skb if the socket still exists in gc_candidates after purging collected skb. Then, we need to set NULL to oob_skb before calling kfree_skb() because it calls last fput() and triggers unix_release_sock(), where we call duplicate kfree_skb(u->oob_skb) if not NULL. Note that the leaked socket remained being linked to a global list, so kmemleak also could not detect it. We need to check /proc/net/protocol to notice the unfreed socket. [0]: WARNING: CPU: 0 PID: 2863 at net/unix/garbage.c:345 __unix_gc+0xc74/0xe80 net/unix/garbage.c:345 Modules linked in: CPU: 0 PID: 2863 Comm: kworker/u4:11 Not tainted 6.8.0-rc1-syzkaller-00583-g1701940b1a02 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: events_unbound __unix_gc RIP: 0010:__unix_gc+0xc74/0xe80 net/unix/garbage.c:345 Code: 8b 5c 24 50 e9 86 f8 ff ff e8 f8 e4 22 f8 31 d2 48 c7 c6 30 6a 69 89 4c 89 ef e8 97 ef ff ff e9 80 f9 ff ff e8 dd e4 22 f8 90 <0f> 0b 90 e9 7b fd ff ff 48 89 df e8 5c e7 7c f8 e9 d3 f8 ff ff e8 RSP: 0018:ffffc9000b03fba0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc9000b03fc10 RCX: ffffffff816c493e RDX: ffff88802c02d940 RSI: ffffffff896982f3 RDI: ffffc9000b03fb30 RBP: ffffc9000b03fce0 R08: 0000000000000001 R09: fffff52001607f66 R10: 0000000000000003 R11: 0000000000000002 R12: dffffc0000000000 R13: ffffc9000b03fc10 R14: ffffc9000b03fc10 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005559c8677a60 CR3: 000000000d57a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> process_one_work+0x889/0x15e0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: af_unix: Llame a kfree_skb() para unix_(sk)->oob_skb muerto en GC. syzbot informó una advertencia [0] en __unix_gc() con una reproducción, que crea un par de sockets y se envía el fd de un socket a sí mismo utilizando el par. socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0 sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\360", iov_len=1}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, MSG_OOB|MSG_PROBE|MSG_DONTWAIT|MSG_ZEROCOPY) = 1 Esto forma una referencia autocíclica ese GC finalmente debería desenredarse, pero no lo hace debido a la falta de manejo de MSG_OOB, lo que resulta en una pérdida de memoria. Recientemente, el commit 11498715f266 ("af_unix: Eliminar el código io_uring para GC.") eliminó el código inactivo de io_uring en GC y reveló el problema. El código se ejecutó en la etapa final de GC y movió incondicionalmente todos los candidatos de GC de gc_candidates a gc_inflight_list. • https://git.kernel.org/stable/c/f3969427fb06a2c3cd6efd7faab63505cfa76e76 https://git.kernel.org/stable/c/ac1968ac399205fda9ee3b18f7de7416cb3a5d0d https://git.kernel.org/stable/c/2aab4b96900272885bc157f8b236abf1cdc02e08 https://git.kernel.org/stable/c/a59d6306263c38e5c0592ea4451ca26a0778c947 https://git.kernel.org/stable/c/4fe505c63aa3273135a57597fda761e9aecc7668 https://git.kernel.org/stable/c/e0e09186d8821ad59806115d347ea32efa43ca4b https://git.kernel.org/stable/c/b74aa9ce13d02b7fd37c5325b99854f91b9b4276 https://git.kernel.org/stable/c/82ae47c5c3a6b27fdc0f9e83c1499cb43 •
CVSS: 5.5EPSS: 0%CPEs: 8EXPL: 0CVE-2024-26675 – ppp_async: limit MRU to 64K
https://notcve.org/view.php?id=CVE-2024-26675
In the Linux kernel, the following vulnerability has been resolved: ppp_async: limit MRU to 64K syzbot triggered a warning [1] in __alloc_pages(): WARN_ON_ONCE_GFP(order > MAX_PAGE_ORDER, gfp) Willem fixed a similar issue in commit c0a2a1b0d631 ("ppp: limit MRU to 64K") Adopt the same sanity check for ppp_async_ioctl(PPPIOCSMRU) [1]: WARNING: CPU: 1 PID: 11 at mm/page_alloc.c:4543 __alloc_pages+0x308/0x698 mm/page_alloc.c:4543 Modules linked in: CPU: 1 PID: 11 Comm: kworker/u4:0 Not tainted 6.8.0-rc2-syzkaller-g41bccc98fb79 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: events_unbound flush_to_ldisc pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __alloc_pages+0x308/0x698 mm/page_alloc.c:4543 lr : __alloc_pages+0xc8/0x698 mm/page_alloc.c:4537 sp : ffff800093967580 x29: ffff800093967660 x28: ffff8000939675a0 x27: dfff800000000000 x26: ffff70001272ceb4 x25: 0000000000000000 x24: ffff8000939675c0 x23: 0000000000000000 x22: 0000000000060820 x21: 1ffff0001272ceb8 x20: ffff8000939675e0 x19: 0000000000000010 x18: ffff800093967120 x17: ffff800083bded5c x16: ffff80008ac97500 x15: 0000000000000005 x14: 1ffff0001272cebc x13: 0000000000000000 x12: 0000000000000000 x11: ffff70001272cec1 x10: 1ffff0001272cec0 x9 : 0000000000000001 x8 : ffff800091c91000 x7 : 0000000000000000 x6 : 000000000000003f x5 : 00000000ffffffff x4 : 0000000000000000 x3 : 0000000000000020 x2 : 0000000000000008 x1 : 0000000000000000 x0 : ffff8000939675e0 Call trace: __alloc_pages+0x308/0x698 mm/page_alloc.c:4543 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] __kmalloc_large_node+0xbc/0x1fc mm/slub.c:3926 __do_kmalloc_node mm/slub.c:3969 [inline] __kmalloc_node_track_caller+0x418/0x620 mm/slub.c:4001 kmalloc_reserve+0x17c/0x23c net/core/skbuff.c:590 __alloc_skb+0x1c8/0x3d8 net/core/skbuff.c:651 __netdev_alloc_skb+0xb8/0x3e8 net/core/skbuff.c:715 netdev_alloc_skb include/linux/skbuff.h:3235 [inline] dev_alloc_skb include/linux/skbuff.h:3248 [inline] ppp_async_input drivers/net/ppp/ppp_async.c:863 [inline] ppp_asynctty_receive+0x588/0x186c drivers/net/ppp/ppp_async.c:341 tty_ldisc_receive_buf+0x12c/0x15c drivers/tty/tty_buffer.c:390 tty_port_default_receive_buf+0x74/0xac drivers/tty/tty_port.c:37 receive_buf drivers/tty/tty_buffer.c:444 [inline] flush_to_ldisc+0x284/0x6e4 drivers/tty/tty_buffer.c:494 process_one_work+0x694/0x1204 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ppp_async: limitar MRU a 64K syzbot activó una advertencia [1] en __alloc_pages(): WARN_ON_ONCE_GFP(order > MAX_PAGE_ORDER, gfp) Willem solucionó un problema similar en el commit c0a2a1b0d631 ("ppp: limite MRU a 64K") Adopte la misma verificación de cordura para ppp_async_ioctl(PPPIOCSMRU) [1]: ADVERTENCIA: CPU: 1 PID: 11 en mm/page_alloc.c:4543 __alloc_pages+0x308/0x698 mm/page_alloc.c:4543 Módulos vinculados en: CPU: 1 PID: 11 Comm: kworker/u4:0 No contaminado 6.8.0-rc2-syzkaller-g41bccc98fb79 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 17/11/2023 Cola de trabajo: events_unbound flux_to_ldisc pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __alloc_pages+0x308/0x698 mm/page_alloc.c:4543 lr : __alloc_pages+0xc8/0x698 mm/page_alloc.c:4537 sp: ffff800093967580 x29: ffff800093967660 x28: ffff8000939675a0 x27: dfff800000000000 x26: ffff70001272ceb4 x25: 0000000000000000 x24: ffff8000 939675c0 x23: 0000000000000000 x22: 0000000000060820 x21: 1ffff0001272ceb8 x20: ffff8000939675e0 x19: 0000000000000010 x18: ffff8000939671 20 x17: ffff800083bded5c x16: ffff80008ac97500 x15: 00000000000000005 x14: 1ffff0001272cebc x13: 0000000000000000 x12: 0000000000000000 x11: ffff70001272cec1 x10: 1ffff0001272cec0 x9: 0000000000000001 x8: ffff800091c 91000 x7: 0000000000000000 x6: 000000000000003f x5: 00000000ffffffff x4: 0000000000000000 x3: 00000000000000020 x2: 0000000000000008 x1: 0000000000000000 x0: ffff8000939675e0 Rastreo de llamadas: __alloc_pages+0x308/ 0x698 mm/page_alloc.c:4543 __alloc_pages_node include/linux/gfp.h:238 [en línea] alloc_pages_node include/linux/gfp.h:261 [en línea] __kmalloc_large_node+0xbc/0x1fc mm/slub.c:3926 __do_kmalloc_node mm/slub .c:3969 [en línea] __kmalloc_node_track_caller+0x418/0x620 mm/slub.c:4001 kmalloc_reserve+0x17c/0x23c net/core/skbuff.c:590 __alloc_skb+0x1c8/0x3d8 net/core/skbuff.c:651 __netdev_alloc_skb+0x b8 /0x3e8 net/core/skbuff.c:715 netdev_alloc_skb include/linux/skbuff.h:3235 [en línea] dev_alloc_skb include/linux/skbuff.h:3248 [en línea] ppp_async_input drivers/net/ppp/ppp_async.c:863 [ en línea] ppp_asynctty_receive+0x588/0x186c controladores/net/ppp/ppp_async.c:341 tty_ldisc_receive_buf+0x12c/0x15c controladores/tty/tty_buffer.c:390 tty_port_default_receive_buf+0x74/0xac controladores/tty/tty_port.c:37 recibir_buf controladores /tty /tty_buffer.c:444 [en línea] Flush_to_ldisc+0x284/0x6e4 controladores/tty/tty_buffer.c:494 Process_one_work+0x694/0x1204 kernel/workqueue.c:2633 Process_scheduled_works kernel/workqueue.c:2706 [en línea] trabajador_thread+0x938/ 0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 • https://git.kernel.org/stable/c/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 https://git.kernel.org/stable/c/4fdb14ba89faff6e6969a4dffdc8e54235d6e5ed https://git.kernel.org/stable/c/56fae81633ccee307cfcb032f706bf1863a56982 https://git.kernel.org/stable/c/b06e067e93fa4b98acfd3a9f38a398ab91bbc58b https://git.kernel.org/stable/c/58fbe665b097bf7b3144da7e7b91fb27aa8d0ae3 https://git.kernel.org/stable/c/4e2c4846b2507f6dfc9bea72b7567c2693a82a16 https://git.kernel.org/stable/c/7e5ef49670766c9742ffcd9cead7cdb018268719 https://git.kernel.org/stable/c/210d938f963dddc543b07e66a79b7d8d4 • CWE-20: Improper Input Validation •
CVSS: 6.1EPSS: 0%CPEs: 7EXPL: 0CVE-2024-26673 – netfilter: nft_ct: sanitize layer 3 and 4 protocol number in custom expectations
https://notcve.org/view.php?id=CVE-2024-26673
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: sanitize layer 3 and 4 protocol number in custom expectations - Disallow families other than NFPROTO_{IPV4,IPV6,INET}. - Disallow layer 4 protocol with no ports, since destination port is a mandatory attribute for this object. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: netfilter: nft_ct: desinfecta el número de protocolo de capa 3 y 4 en expectativas personalizadas - No permitir familias que no sean NFPROTO_{IPV4,IPV6,INET}. - No permitir el protocolo de capa 4 sin puertos, ya que el puerto de destino es un atributo obligatorio para este objeto. • https://git.kernel.org/stable/c/857b46027d6f91150797295752581b7155b9d0e1 https://git.kernel.org/stable/c/f549f340c91f08b938d60266e792ff7748dae483 https://git.kernel.org/stable/c/65ee90efc928410c6f73b3d2e0afdd762652c09d https://git.kernel.org/stable/c/b775ced05489f4b77a35fe203e9aeb22f428e38f https://git.kernel.org/stable/c/0f501dae16b7099e69ee9b0d5c70b8f40fd30e98 https://git.kernel.org/stable/c/cfe3550ea5df292c9e2d608e8c4560032391847e https://git.kernel.org/stable/c/38cc1605338d99205a263707f4dde76408d3e0e8 https://git.kernel.org/stable/c/8059918a1377f2f1fff06af4f5a4ed3d5 • CWE-99: Improper Control of Resource Identifiers ('Resource Injection') •
CVSS: 7.1EPSS: 0%CPEs: 2EXPL: 0CVE-2024-26672 – drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_smu_get_mca_entry()'
https://notcve.org/view.php?id=CVE-2024-26672
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_smu_get_mca_entry()' Fixes the below: drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c:377 amdgpu_mca_smu_get_mca_entry() warn: variable dereferenced before check 'mca_funcs' (see line 368) 357 int amdgpu_mca_smu_get_mca_entry(struct amdgpu_device *adev, enum amdgpu_mca_error_type type, 358 int idx, struct mca_bank_entry *entry) 359 { 360 const struct amdgpu_mca_smu_funcs *mca_funcs = adev->mca.mca_funcs; 361 int count; 362 363 switch (type) { 364 case AMDGPU_MCA_ERROR_TYPE_UE: 365 count = mca_funcs->max_ue_count; mca_funcs is dereferenced here. 366 break; 367 case AMDGPU_MCA_ERROR_TYPE_CE: 368 count = mca_funcs->max_ce_count; mca_funcs is dereferenced here. 369 break; 370 default: 371 return -EINVAL; 372 } 373 374 if (idx >= count) 375 return -EINVAL; 376 377 if (mca_funcs && mca_funcs->mca_get_mca_entry) ^^^^^^^^^ Checked too late! En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amdgpu: corrige la variable 'mca_funcs' desreferenciada antes de la comprobación NULL en 'amdgpu_mca_smu_get_mca_entry()' Corrige lo siguiente: drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c:377 amdgpu_mca_smu_get_mca_entry() advertencia: variable desreferenciada antes de verificar 'mca_funcs' (ver línea 368) 357 int amdgpu_mca_smu_get_mca_entry(struct amdgpu_device *adev, enum amdgpu_mca_error_type type, 358 int idx, struct mca_bank_entry *entry) 359 { 360 const struct amdgpu_mca_smu_funcs *mca_funcs = adev- >mca.mca_funcs; 361 recuentos internacionales; 362 363 interruptor (tipo) { 364 caso AMDGPU_MCA_ERROR_TYPE_UE: 365 recuento = mca_funcs->max_ue_count; Aquí se elimina la referencia a mca_funcs. 366 descanso; 367 caso AMDGPU_MCA_ERROR_TYPE_CE: 368 recuento = mca_funcs->max_ce_count; Aquí se elimina la referencia a mca_funcs. 369 descanso; 370 predeterminado: 371 retorno -EINVAL; 372 } 373 374 si (idx >= recuento) 375 retorno -EINVAL; 376 377 if (mca_funcs && mca_funcs->mca_get_mca_entry) ^^^^^^^^^ ¡Comprobado demasiado tarde! • https://git.kernel.org/stable/c/7b5d58c07024516c0e81b95e98f37710cf402c53 https://git.kernel.org/stable/c/4f32504a2f85a7b40fe149436881381f48e9c0c0 https://access.redhat.com/security/cve/CVE-2024-26672 https://bugzilla.redhat.com/show_bug.cgi?id=2272814 • CWE-476: NULL Pointer Dereference •
CVSS: 4.4EPSS: 0%CPEs: 8EXPL: 0CVE-2024-26671 – blk-mq: fix IO hang from sbitmap wakeup race
https://notcve.org/view.php?id=CVE-2024-26671
In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix IO hang from sbitmap wakeup race In blk_mq_mark_tag_wait(), __add_wait_queue() may be re-ordered with the following blk_mq_get_driver_tag() in case of getting driver tag failure. Then in __sbitmap_queue_wake_up(), waitqueue_active() may not observe the added waiter in blk_mq_mark_tag_wait() and wake up nothing, meantime blk_mq_mark_tag_wait() can't get driver tag successfully. This issue can be reproduced by running the following test in loop, and fio hang can be observed in < 30min when running it on my test VM in laptop. modprobe -r scsi_debug modprobe scsi_debug delay=0 dev_size_mb=4096 max_queue=1 host_max_queue=1 submit_queues=4 dev=`ls -d /sys/bus/pseudo/drivers/scsi_debug/adapter*/host*/target*/*/block/* | head -1 | xargs basename` fio --filename=/dev/"$dev" --direct=1 --rw=randrw --bs=4k --iodepth=1 \ --runtime=100 --numjobs=40 --time_based --name=test \ --ioengine=libaio Fix the issue by adding one explicit barrier in blk_mq_mark_tag_wait(), which is just fine in case of running out of tag. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: blk-mq: corrige el bloqueo de IO de la carrera de activación del mapa de bits En blk_mq_mark_tag_wait(), __add_wait_queue() se puede reordenar con el siguiente blk_mq_get_driver_tag() en caso de que se produzca un error en la etiqueta del controlador. Luego, en __sbitmap_queue_wake_up(), waitqueue_active() puede no observar al camarero agregado en blk_mq_mark_tag_wait() y no despertar nada, mientras tanto, blk_mq_mark_tag_wait() no puede obtener la etiqueta del controlador correctamente. Este problema se puede reproducir ejecutando la siguiente prueba en bucle, y se puede observar un bloqueo de fio en < 30 minutos cuando lo ejecuto en mi máquina virtual de prueba en una computadora portátil. modprobe -r scsi_debug modprobe scsi_debug delay=0 dev_size_mb=4096 max_queue=1 host_max_queue=1 submit_queues=4 dev=`ls -d /sys/bus/pseudo/drivers/scsi_debug/adapter*/host*/target*/*/block /* | cabeza -1 | xargs basename` fio --filename=/dev/"$dev" --direct=1 --rw=randrw --bs=4k --io Depth=1 \ --runtime=100 --numjobs=40 --time_based - -name=test \ --ioengine=libaio Solucione el problema agregando una barrera explícita en blk_mq_mark_tag_wait(), lo cual está bien en caso de quedarse sin etiqueta. • https://git.kernel.org/stable/c/9525b38180e2753f0daa1a522b7767a2aa969676 https://git.kernel.org/stable/c/ecd7744a1446eb02ccc63e493e2eb6ede4ef1e10 https://git.kernel.org/stable/c/7610ba1319253225a9ba8a9d28d472fc883b4e2f https://git.kernel.org/stable/c/89e0e66682e1538aeeaa3109503473663cd24c8b https://git.kernel.org/stable/c/1d9c777d3e70bdc57dddf7a14a80059d65919e56 https://git.kernel.org/stable/c/6d8b01624a2540336a32be91f25187a433af53a0 https://git.kernel.org/stable/c/f1bc0d8163f8ee84a8d5affdf624cfad657df1d2 https://git.kernel.org/stable/c/5266caaf5660529e3da53004b8b7174ca • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') •