CVSS: 6.2EPSS: 0%CPEs: 4EXPL: 0CVE-2024-36910 – uio_hv_generic: Don't free decrypted memory
https://notcve.org/view.php?id=CVE-2024-36910
In the Linux kernel, the following vulnerability has been resolved: uio_hv_generic: Don't free decrypted memory In CoCo VMs it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. The VMBus device UIO driver could free decrypted/shared pages if set_memory_decrypted() fails. Check the decrypted field in the gpadl to decide whether to free the memory. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: uio_hv_generic: no liberar memoria descifrada. En las máquinas virtuales CoCo, es posible que el host que no es de confianza provoque que set_memory_encrypted() o set_memory_decrypted() falle, de modo que se devuelva un error y el resultado La memoria es compartida. • https://git.kernel.org/stable/c/dabf12bf994318d939f70d47cfda30e47abb2c54 https://git.kernel.org/stable/c/6466a0f6d235c8a18c602cb587160d7e49876db9 https://git.kernel.org/stable/c/fe2c58602354fbd60680dc42ac3a0b772cda7d23 https://git.kernel.org/stable/c/3d788b2fbe6a1a1a9e3db09742b90809d51638b7 • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2024-36909 – Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted
https://notcve.org/view.php?id=CVE-2024-36909
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted In CoCo VMs it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. The VMBus ring buffer code could free decrypted/shared pages if set_memory_decrypted() fails. Check the decrypted field in the struct vmbus_gpadl for the ring buffers to decide whether to free the memory. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Controladores: hv: vmbus: no liberar búferes de anillo que no se pudieron volver a cifrar. En las máquinas virtuales CoCo, es posible que el host que no es de confianza cause set_memory_encrypted() o set_memory_decrypted( ) falle de modo que se devuelva un error y se comparta la memoria resultante. • https://git.kernel.org/stable/c/2f622008bf784a9f5dd17baa19223cc2ac30a039 https://git.kernel.org/stable/c/82f9e213b124a7d2bb5b16ea35d570260ef467e0 https://git.kernel.org/stable/c/a9212a4e2963a7fbe3864ba33dc551d4ad8d0abb https://git.kernel.org/stable/c/30d18df6567be09c1433e81993e35e3da573ac48 •
CVSS: 7.1EPSS: 0%CPEs: 3EXPL: 0CVE-2024-36908 – blk-iocost: do not WARN if iocg was already offlined
https://notcve.org/view.php?id=CVE-2024-36908
In the Linux kernel, the following vulnerability has been resolved: blk-iocost: do not WARN if iocg was already offlined In iocg_pay_debt(), warn is triggered if 'active_list' is empty, which is intended to confirm iocg is active when it has debt. However, warn can be triggered during a blkcg or disk removal, if iocg_waitq_timer_fn() is run at that time: WARNING: CPU: 0 PID: 2344971 at block/blk-iocost.c:1402 iocg_pay_debt+0x14c/0x190 Call trace: iocg_pay_debt+0x14c/0x190 iocg_kick_waitq+0x438/0x4c0 iocg_waitq_timer_fn+0xd8/0x130 __run_hrtimer+0x144/0x45c __hrtimer_run_queues+0x16c/0x244 hrtimer_interrupt+0x2cc/0x7b0 The warn in this situation is meaningless. Since this iocg is being removed, the state of the 'active_list' is irrelevant, and 'waitq_timer' is canceled after removing 'active_list' in ioc_pd_free(), which ensures iocg is freed after iocg_waitq_timer_fn() returns. Therefore, add the check if iocg was already offlined to avoid warn when removing a blkcg or disk. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: blk-iocost: no ADVERTIR si iocg ya estaba desconectado. En iocg_pay_debt(), se activa una advertencia si 'active_list' está vacía, lo que pretende confirmar que iocg está activo cuando deuda. • https://git.kernel.org/stable/c/1c172ac7afe4442964f4153b2c78fe4e005d9d67 https://git.kernel.org/stable/c/14b3275f93d4a0d8ddc02195bc4e9869b7a3700e https://git.kernel.org/stable/c/01bc4fda9ea0a6b52f12326486f07a4910666cf6 •
CVSS: 9.8EPSS: 0%CPEs: 8EXPL: 0CVE-2024-36905 – tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets
https://notcve.org/view.php?id=CVE-2024-36905
In the Linux kernel, the following vulnerability has been resolved: tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets TCP_SYN_RECV state is really special, it is only used by cross-syn connections, mostly used by fuzzers. In the following crash [1], syzbot managed to trigger a divide by zero in tcp_rcv_space_adjust() A socket makes the following state transitions, without ever calling tcp_init_transfer(), meaning tcp_init_buffer_space() is also not called. TCP_CLOSE connect() TCP_SYN_SENT TCP_SYN_RECV shutdown() -> tcp_shutdown(sk, SEND_SHUTDOWN) TCP_FIN_WAIT1 To fix this issue, change tcp_shutdown() to not perform a TCP_SYN_RECV -> TCP_FIN_WAIT1 transition, which makes no sense anyway. When tcp_rcv_state_process() later changes socket state from TCP_SYN_RECV to TCP_ESTABLISH, then look at sk->sk_shutdown to finally enter TCP_FIN_WAIT1 state, and send a FIN packet from a sane socket state. This means tcp_send_fin() can now be called from BH context, and must use GFP_ATOMIC allocations. [1] divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 1 PID: 5084 Comm: syz-executor358 Not tainted 6.9.0-rc6-syzkaller-00022-g98369dccd2f8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:tcp_rcv_space_adjust+0x2df/0x890 net/ipv4/tcp_input.c:767 Code: e3 04 4c 01 eb 48 8b 44 24 38 0f b6 04 10 84 c0 49 89 d5 0f 85 a5 03 00 00 41 8b 8e c8 09 00 00 89 e8 29 c8 48 0f af c3 31 d2 <48> f7 f1 48 8d 1c 43 49 8d 96 76 08 00 00 48 89 d0 48 c1 e8 03 48 RSP: 0018:ffffc900031ef3f0 EFLAGS: 00010246 RAX: 0c677a10441f8f42 RBX: 000000004fb95e7e RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000027d4b11f R08: ffffffff89e535a4 R09: 1ffffffff25e6ab7 R10: dffffc0000000000 R11: ffffffff8135e920 R12: ffff88802a9f8d30 R13: dffffc0000000000 R14: ffff88802a9f8d00 R15: 1ffff1100553f2da FS: 00005555775c0380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1155bf2304 CR3: 000000002b9f2000 CR4: 0000000000350ef0 Call Trace: <TASK> tcp_recvmsg_locked+0x106d/0x25a0 net/ipv4/tcp.c:2513 tcp_recvmsg+0x25d/0x920 net/ipv4/tcp.c:2578 inet6_recvmsg+0x16a/0x730 net/ipv6/af_inet6.c:680 sock_recvmsg_nosec net/socket.c:1046 [inline] sock_recvmsg+0x109/0x280 net/socket.c:1068 ____sys_recvmsg+0x1db/0x470 net/socket.c:2803 ___sys_recvmsg net/socket.c:2845 [inline] do_recvmmsg+0x474/0xae0 net/socket.c:2939 __sys_recvmmsg net/socket.c:3018 [inline] __do_sys_recvmmsg net/socket.c:3041 [inline] __se_sys_recvmmsg net/socket.c:3034 [inline] __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7faeb6363db9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcc1997168 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faeb6363db9 RDX: 0000000000000001 RSI: 0000000020000bc0 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000001c R10: 0000000000000122 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp: diferir apagado (SEND_SHUTDOWN) para sockets TCP_SYN_RECV El estado TCP_SYN_RECV es realmente especial, solo lo usan conexiones cross-syn, principalmente usado por fuzzers. En el siguiente fallo [1], syzbot logró activar una división por cero en tcp_rcv_space_adjust(). Un socket realiza las siguientes transiciones de estado, sin siquiera llamar a tcp_init_transfer(), lo que significa que tampoco se llama a tcp_init_buffer_space(). TCP_CLOSE connect() TCP_SYN_SENT TCP_SYN_RECV Shutdown() -> tcp_shutdown(sk, SEND_SHUTDOWN) TCP_FIN_WAIT1 Para solucionar este problema, cambie tcp_shutdown() para no realizar una transición TCP_SYN_RECV -> TCP_FIN_WAIT1, lo que de todos modos no tiene sentido. Cuando tcp_rcv_state_process() luego cambie el estado del socket de TCP_SYN_RECV a TCP_ESTABLISH, mire sk->sk_shutdown para finalmente ingresar al estado TCP_FIN_WAIT1 y envíe un paquete FIN desde un estado de socket sano. • https://git.kernel.org/stable/c/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 https://git.kernel.org/stable/c/34e41a031fd7523bf1cd00a2adca2370aebea270 https://git.kernel.org/stable/c/ed5e279b69e007ce6c0fe82a5a534c1b19783214 https://git.kernel.org/stable/c/413c33b9f3bc36fdf719690a78824db9f88a9485 https://git.kernel.org/stable/c/2552c9d9440f8e7a2ed0660911ff00f25b90a0a4 https://git.kernel.org/stable/c/3fe4ef0568a48369b1891395d13ac593b1ba41b1 https://git.kernel.org/stable/c/f47d0d32fa94e815fdd78b8b88684873e67939f4 https://git.kernel.org/stable/c/cbf232ba11bc86a5281b4f00e1151349e • CWE-369: Divide By Zero •
CVSS: 5.5EPSS: 0%CPEs: 8EXPL: 0CVE-2024-36902 – ipv6: fib6_rules: avoid possible NULL dereference in fib6_rule_action()
https://notcve.org/view.php?id=CVE-2024-36902
In the Linux kernel, the following vulnerability has been resolved: ipv6: fib6_rules: avoid possible NULL dereference in fib6_rule_action() syzbot is able to trigger the following crash [1], caused by unsafe ip6_dst_idev() use. Indeed ip6_dst_idev() can return NULL, and must always be checked. [1] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 31648 Comm: syz-executor.0 Not tainted 6.9.0-rc4-next-20240417-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:__fib6_rule_action net/ipv6/fib6_rules.c:237 [inline] RIP: 0010:fib6_rule_action+0x241/0x7b0 net/ipv6/fib6_rules.c:267 Code: 02 00 00 49 8d 9f d8 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f9 32 bf f7 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 e0 32 bf f7 4c 8b 03 48 89 ef 4c RSP: 0018:ffffc9000fc1f2f0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1a772f98c8186700 RDX: 0000000000000003 RSI: ffffffff8bcac4e0 RDI: ffffffff8c1f9760 RBP: ffff8880673fb980 R08: ffffffff8fac15ef R09: 1ffffffff1f582bd R10: dffffc0000000000 R11: fffffbfff1f582be R12: dffffc0000000000 R13: 0000000000000080 R14: ffff888076509000 R15: ffff88807a029a00 FS: 00007f55e82ca6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31d23000 CR3: 0000000022b66000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> fib_rules_lookup+0x62c/0xdb0 net/core/fib_rules.c:317 fib6_rule_lookup+0x1fd/0x790 net/ipv6/fib6_rules.c:108 ip6_route_output_flags_noref net/ipv6/route.c:2637 [inline] ip6_route_output_flags+0x38e/0x610 net/ipv6/route.c:2649 ip6_route_output include/net/ip6_route.h:93 [inline] ip6_dst_lookup_tail+0x189/0x11a0 net/ipv6/ip6_output.c:1120 ip6_dst_lookup_flow+0xb9/0x180 net/ipv6/ip6_output.c:1250 sctp_v6_get_dst+0x792/0x1e20 net/sctp/ipv6.c:326 sctp_transport_route+0x12c/0x2e0 net/sctp/transport.c:455 sctp_assoc_add_peer+0x614/0x15c0 net/sctp/associola.c:662 sctp_connect_new_asoc+0x31d/0x6c0 net/sctp/socket.c:1099 __sctp_connect+0x66d/0xe30 net/sctp/socket.c:1197 sctp_connect net/sctp/socket.c:4819 [inline] sctp_inet_connect+0x149/0x1f0 net/sctp/socket.c:4834 __sys_connect_file net/socket.c:2048 [inline] __sys_connect+0x2df/0x310 net/socket.c:2065 __do_sys_connect net/socket.c:2075 [inline] __se_sys_connect net/socket.c:2072 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2072 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: fib6_rules: evita una posible desreferencia NULL en fib6_rule_action() syzbot es capaz de desencadenar el siguiente bloqueo [1], causado por el uso inseguro de ip6_dst_idev(). De hecho, ip6_dst_idev() puede devolver NULL y siempre debe verificarse. [1] Vaya: fallo de protección general, probablemente para la dirección no canónica 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref en el rango [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 31648 Comm : syz- executor.0 No contaminado 6.9.0-rc4-next-20240417-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 27/03/2024 RIP: 0010:__fib6_rule_action net/ipv6/fib6_rules.c: 237 [en línea] RIP: 0010:fib6_rule_action+0x241/0x7b0 net/ipv6/fib6_rules.c:267 Código: 02 00 00 49 8d 9f d8 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f9 32 bf f7 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 e0 32 bf f7 4c 8b 03 48 89 ef 4c RSP:ffffc9000fc1f2f 0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000000000000 RCX: 1a772f98c8186700 RDX: 0000000000000003 RSI: ffffffff8bcac4e0 RDI: ffffffff8c1f9760 RBP: ffff8880673f b980 R08: ffffffff8fac15ef R09: 1ffffffff1f582bd R10: dffffc0000000000 R11: ffffbfff1f582be R12: dffffc0000000000 R13: 0000000000000080 R14: ffff88807650 9000 R15: ffff88807a029a00 FS: 00007f55e82ca6c0(0000) GS :ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31d23000 CR3: 0000000022b66000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 00000000000000000 DR6: 00000000ffe0ff0 DR7: 0000000000400 Seguimiento de llamadas: fib_rules_lookup+0x62c/0xdb0 net/core/fib_rules.c:317 fib6_rule_lookup+0x1fd/0x790 net/ipv6/fib6_rules.c:108 ip6_route_output_flags_noref net/ipv6/route.c:2637 [en línea] gs+0x38e/0x610 neto /ipv6/route.c:2649 ip6_route_output include/net/ip6_route.h:93 [en línea] ip6_dst_lookup_tail+0x189/0x11a0 net/ipv6/ip6_output.c:1120 ip6_dst_lookup_flow+0xb9/0x180 net/ipv6/ip6_output.c:1250 sctp_v6_get_dst +0x792/0x1e20 net/sctp/ipv6.c:326 sctp_transport_route+0x12c/0x2e0 net/sctp/transport.c:455 sctp_assoc_add_peer+0x614/0x15c0 net/sctp/associola.c:662 sctp_connect_new_asoc+0x31d/ 0x6c0 neto/sctp/ socket.c:1099 __sctp_connect+0x66d/0xe30 net/sctp/socket.c:1197 sctp_connect net/sctp/socket.c:4819 [en línea] sctp_inet_connect+0x149/0x1f0 net/sctp/socket.c:4834 __sys_connect_file net/socket .c:2048 [en línea] __sys_connect+0x2df/0x310 net/socket.c:2065 __do_sys_connect net/socket.c:2075 [en línea] __se_sys_connect net/socket.c:2072 [en línea] __x64_sys_connect+0x7a/0x90 net/socket. c:2072 do_syscall_x64 arch/x86/entry/common.c:52 [en línea] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x77/0x7f • https://git.kernel.org/stable/c/5e5f3f0f801321078c897a5de0b4b4304f234da0 https://git.kernel.org/stable/c/4a5a573387da6a6b23a4cc62147453ff1bc32afa https://git.kernel.org/stable/c/ddec23f206a944c73bcc2724358b85388837daff https://git.kernel.org/stable/c/674c951ab8a23f7aff9b4c3f2f865901bc76a290 https://git.kernel.org/stable/c/35297fc68de36826087e976f86a5b1f94fd0bf95 https://git.kernel.org/stable/c/7e3242c139c38e60844638e394c2877b16b396b0 https://git.kernel.org/stable/c/8745a8d74ba17dafe72b6ab461fa6c007d879747 https://git.kernel.org/stable/c/1876881c9a49613b5249fb400cbf53412 • CWE-476: NULL Pointer Dereference •