CVE-2024-26780
Vulnerability from cvelistv5
Published
2024-04-04 08:20
Modified
2024-11-05 09:15
Severity ?
Summary
af_unix: Fix task hung while purging oob_skb in GC.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/25236c91b5ab4a26a56ba2e79b8060cf4e047839
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a3d40b4025fcfe51b04924979f1653993b17669
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/36f7371de977f805750748e80279be7e370df85c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/69e0f04460f4037e01e29f0d9675544f62aafca3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cb8890318dde26fc89c6ea67d6e9070ab50b6e91
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "product": "Linux",
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Fix task hung while purging oob_skb in GC.\n\nsyzbot reported a task hung; at the same time, GC was looping infinitely\nin list_for_each_entry_safe() for OOB skb.  [0]\n\nsyzbot demonstrated that the list_for_each_entry_safe() was not actually\nsafe in this case.\n\nA single skb could have references for multiple sockets.  If we free such\na skb in the list_for_each_entry_safe(), the current and next sockets could\nbe unlinked in a single iteration.\n\nunix_notinflight() uses list_del_init() to unlink the socket, so the\nprefetched next socket forms a loop itself and list_for_each_entry_safe()\nnever stops.\n\nHere, we must use while() and make sure we always fetch the first socket.\n\n[0]:\nSending NMI from CPU 0 to CPUs 1:\nNMI backtrace for cpu 1\nCPU: 1 PID: 5065 Comm: syz-executor236 Not tainted 6.8.0-rc3-syzkaller-00136-g1f719a2f3fa6 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nRIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]\nRIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]\nRIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:207\nCode: cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 14 25 40 c2 03 00 \u003c65\u003e 8b 05 b4 7c 78 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74\nRSP: 0018:ffffc900033efa58 EFLAGS: 00000283\nRAX: ffff88807b077800 RBX: ffff88807b077800 RCX: 1ffffffff27b1189\nRDX: ffff88802a5a3b80 RSI: ffffffff8968488d RDI: ffff88807b077f70\nRBP: ffffc900033efbb0 R08: 0000000000000001 R09: fffffbfff27a900c\nR10: ffffffff93d48067 R11: ffffffff8ae000eb R12: ffff88807b077800\nR13: dffffc0000000000 R14: ffff88807b077e40 R15: 0000000000000001\nFS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000564f4fc1e3a8 CR3: 000000000d57a000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cNMI\u003e\n \u003c/NMI\u003e\n \u003cTASK\u003e\n unix_gc+0x563/0x13b0 net/unix/garbage.c:319\n unix_release_sock+0xa93/0xf80 net/unix/af_unix.c:683\n unix_release+0x91/0xf0 net/unix/af_unix.c:1064\n __sock_release+0xb0/0x270 net/socket.c:659\n sock_close+0x1c/0x30 net/socket.c:1421\n __fput+0x270/0xb80 fs/file_table.c:376\n task_work_run+0x14f/0x250 kernel/task_work.c:180\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0xa8a/0x2ad0 kernel/exit.c:871\n do_group_exit+0xd4/0x2a0 kernel/exit.c:1020\n __do_sys_exit_group kernel/exit.c:1031 [inline]\n __se_sys_exit_group kernel/exit.c:1029 [inline]\n __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1029\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\nRIP: 0033:0x7f9d6cbdac09\nCode: Unable to access opcode bytes at 0x7f9d6cbdabdf.\nRSP: 002b:00007fff5952feb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9d6cbdac09\nRDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000\nRBP: 00007f9d6cc552b0 R08: ffffffffffffffb8 R09: 0000000000000006\nR10: 0000000000000006 R11: 0000000000000246 R12: 00007f9d6cc552b0\nR13: 0000000000000000 R14: 00007f9d6cc55d00 R15: 00007f9d6cbabe70\n \u003c/TASK\u003e"
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        "dateUpdated": "2024-11-05T09:15:41.057Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "af_unix: Fix task hung while purging oob_skb in GC.",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26780",
    "datePublished": "2024-04-04T08:20:15.120Z",
    "dateReserved": "2024-02-19T14:20:24.177Z",
    "dateUpdated": "2024-11-05T09:15:41.057Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26780\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-04T09:15:07.903\",\"lastModified\":\"2024-04-04T14:15:09.667\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\naf_unix: Fix task hung while purging oob_skb in GC.\\n\\nsyzbot reported a task hung; at the same time, GC was looping infinitely\\nin list_for_each_entry_safe() for OOB skb.  [0]\\n\\nsyzbot demonstrated that the list_for_each_entry_safe() was not actually\\nsafe in this case.\\n\\nA single skb could have references for multiple sockets.  If we free such\\na skb in the list_for_each_entry_safe(), the current and next sockets could\\nbe unlinked in a single iteration.\\n\\nunix_notinflight() uses list_del_init() to unlink the socket, so the\\nprefetched next socket forms a loop itself and list_for_each_entry_safe()\\nnever stops.\\n\\nHere, we must use while() and make sure we always fetch the first socket.\\n\\n[0]:\\nSending NMI from CPU 0 to CPUs 1:\\nNMI backtrace for cpu 1\\nCPU: 1 PID: 5065 Comm: syz-executor236 Not tainted 6.8.0-rc3-syzkaller-00136-g1f719a2f3fa6 #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\\nRIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]\\nRIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]\\nRIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:207\\nCode: cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 14 25 40 c2 03 00 \u003c65\u003e 8b 05 b4 7c 78 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74\\nRSP: 0018:ffffc900033efa58 EFLAGS: 00000283\\nRAX: ffff88807b077800 RBX: ffff88807b077800 RCX: 1ffffffff27b1189\\nRDX: ffff88802a5a3b80 RSI: ffffffff8968488d RDI: ffff88807b077f70\\nRBP: ffffc900033efbb0 R08: 0000000000000001 R09: fffffbfff27a900c\\nR10: ffffffff93d48067 R11: ffffffff8ae000eb R12: ffff88807b077800\\nR13: dffffc0000000000 R14: ffff88807b077e40 R15: 0000000000000001\\nFS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000564f4fc1e3a8 CR3: 000000000d57a000 CR4: 00000000003506f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cNMI\u003e\\n \u003c/NMI\u003e\\n \u003cTASK\u003e\\n unix_gc+0x563/0x13b0 net/unix/garbage.c:319\\n unix_release_sock+0xa93/0xf80 net/unix/af_unix.c:683\\n unix_release+0x91/0xf0 net/unix/af_unix.c:1064\\n __sock_release+0xb0/0x270 net/socket.c:659\\n sock_close+0x1c/0x30 net/socket.c:1421\\n __fput+0x270/0xb80 fs/file_table.c:376\\n task_work_run+0x14f/0x250 kernel/task_work.c:180\\n exit_task_work include/linux/task_work.h:38 [inline]\\n do_exit+0xa8a/0x2ad0 kernel/exit.c:871\\n do_group_exit+0xd4/0x2a0 kernel/exit.c:1020\\n __do_sys_exit_group kernel/exit.c:1031 [inline]\\n __se_sys_exit_group kernel/exit.c:1029 [inline]\\n __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1029\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\\nRIP: 0033:0x7f9d6cbdac09\\nCode: Unable to access opcode bytes at 0x7f9d6cbdabdf.\\nRSP: 002b:00007fff5952feb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9d6cbdac09\\nRDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000\\nRBP: 00007f9d6cc552b0 R08: ffffffffffffffb8 R09: 0000000000000006\\nR10: 0000000000000006 R11: 0000000000000246 R12: 00007f9d6cc552b0\\nR13: 0000000000000000 R14: 00007f9d6cc55d00 R15: 00007f9d6cbabe70\\n \u003c/TASK\u003e\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: af_unix: se corrigi\u00f3 la tarea bloqueada al purgar oob_skb en GC. syzbot inform\u00f3 que se hab\u00eda colgado una tarea; al mismo tiempo, GC hac\u00eda un bucle infinito en list_for_each_entry_safe() para OOB skb. [0] syzbot demostr\u00f3 que list_for_each_entry_safe() en realidad no era seguro en este caso. Un solo skb podr\u00eda tener referencias para m\u00faltiples sockets. Si liberamos dicho skb en list_for_each_entry_safe(), los sockets actual y siguiente podr\u00edan desvincularse en una sola iteraci\u00f3n. unix_notinflight() usa list_del_init() para desvincular el socket, por lo que el siguiente socket precargado forma un bucle y list_for_each_entry_safe() nunca se detiene. Aqu\u00ed, debemos usar while() y asegurarnos de buscar siempre el primer socket. [0]: Env\u00edo de NMI desde la CPU 0 a las CPU 1: seguimiento de NMI para la CPU 1 CPU: 1 PID: 5065 Comm: syz-executor236 Not tainted 6.8.0-rc3-syzkaller-00136-g1f719a2f3fa6 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 25/01/2024 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [en l\u00ednea] RIP: 0010:check_kcov_mode kernel/kcov.c:173 [en l\u00ednea] RIP : 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:207 C\u00f3digo: cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 14 25 40 c2 03 00 \u0026lt;65\u0026gt; 8b 05 b4 7c 78 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 RSP: 0018:ffffc900033efa58 EFLAGS: 00000283 RAX: ffff88807b077800 RBX: ffff88807b077800 RCX: 1ffffffff27b1189 RDX: ffff88802a5a3b80 RSI: ffffffff8968488d RDI: ffff88807b077f70 RBP: ffffc900033efbb0 R08: 00000000000000001 R09: ffffbfff27a900c R10: ffffffff93d48067 R11: ffffffff8ae000eb R12: ffff88807b077800 R13: dffffc0000000000 R14: ffff88807b077e40 R15: 00000000000000001 FS: 0000000000000000(0000) GS:ffff888 0b9500000(0000) knlGS: 0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564f4fc1e3a8 CR3: 000000000d57a000 CR4: 00000000003506f0 DR0: 00 00000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas:    unix_gc+0x563/0x13b0 net/unix/garbage.c:319 unix_release_sock+0xa93/0xf80 net/unix/af_unix.c:683 unix_release+0x91/0xf0 net/unix/af_unix.c:1064 __sock_release+0xb0/0x270 net/socket.c:659 sock_close+0x1c/0x30 net/socket.c:1421 __fput+0x270/0xb80 fs/file_table.c:376 task_work_run+0x14f/0x250 kernel/task_work.c:180 exit_task_work include/linux/task_work. h:38 [en l\u00ednea] do_exit+0xa8a/0x2ad0 kernel/exit.c:871 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [en l\u00ednea] __se_sys_exit_group kernel/exit.c:1029 [ en l\u00ednea] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1029 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x6f/ 0x77 RIP: 0033:0x7f9d6cbdac09 C\u00f3digo: No se puede acceder a los bytes del c\u00f3digo de operaci\u00f3n en 0x7f9d6cbdabdf. RSP: 002b:00007fff5952feb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000000000000 RCX: 00007f9d6cbdac09 RDX: 00000000 0000003c RSI: 00000000000000e7 RDI: 00000000000000000 RBP: 00007f9d6cc552b0 R08: ffffffffffffffffb8 R09: 0000000000000006 R10: 00000000000000006 R1 1: 0000000000000246 R12: 00007f9d6cc552b0 R13: 0000000000000000 R14: 00007f9d6cc55d00 R15: 00007f9d6cbabe70 \"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/25236c91b5ab4a26a56ba2e79b8060cf4e047839\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2a3d40b4025fcfe51b04924979f1653993b17669\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/36f7371de977f805750748e80279be7e370df85c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/69e0f04460f4037e01e29f0d9675544f62aafca3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb8890318dde26fc89c6ea67d6e9070ab50b6e91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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