CVE-2022-50661
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
seccomp: Move copy_seccomp() to no failure path.
Our syzbot instance reported memory leaks in do_seccomp() [0], similar to the report [1]. It shows that we miss freeing struct seccomp_filter and some objects included in it.
We can reproduce the issue with the program below [2] which calls one seccomp() and two clone() syscalls.
The first clone()d child exits earlier than its parent and sends a signal to kill it during the second clone(), more precisely before the fatal_signal_pending() test in copy_process().
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When the parent receives the signal, it has to destroy the embryonic process and return -EINTR to user space. In the failure path, we have to call seccomp_filter_release() to decrement the filter's refcount.
Initially, we called it in free_task() called from the failure path, but the commit 3a15fb6ed92c ("seccomp: release filter after task is fully dead") moved it to release_task() to notify user space as early as possible that the filter is no longer used.
To keep the change and current seccomp refcount semantics, let's move copy_seccomp() just after the signal check and add a WARN_ON_ONCE() in free_task() for future debugging.
Detalles técnicos trazas, registros y código del informe original
[0]:
unreferenced object 0xffff8880063add00 (size 256):
comm "repro_seccomp", pid 230, jiffies 4294687090 (age 9.914s)
hex dump (first 32 bytes):
01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
backtrace:
do_seccomp (./include/linux/slab.h:600 ./include/linux/slab.h:733 kernel/seccomp.c:666 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)
do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
unreferenced object 0xffffc90000035000 (size 4096):
comm "repro_seccomp", pid 230, jiffies 4294687090 (age 9.915s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 05 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
__vmalloc_node_range (mm/vmalloc.c:3226)
__vmalloc_node (mm/vmalloc.c:3261 (discriminator 4))
bpf_prog_alloc_no_stats (kernel/bpf/core.c:91)
bpf_prog_alloc (kernel/bpf/core.c:129)
bpf_prog_create_from_user (net/core/filter.c:1414)
do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)
do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
unreferenced object 0xffff888003fa1000 (size 1024):
comm "repro_seccomp", pid 230, jiffies 4294687090 (age 9.915s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
bpf_prog_alloc_no_stats (./include/linux/slab.h:600 ./include/linux/slab.h:733 kernel/bpf/core.c:95)
bpf_prog_alloc (kernel/bpf/core.c:129)
bpf_prog_create_from_user (net/core/filter.c:1414)
do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)
do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
unreferenced object 0xffff888006360240 (size 16):
comm "repro_seccomp", pid 230, jiffies 4294687090 (age 9.915s)
hex dump (first 16 bytes):
01 00 37 00 76 65 72 6c e0 83 01 06 80 88 ff ff ..7.verl........
backtrace:
bpf_prog_store_orig_filter (net/core/filter.c:1137)
bpf_prog_create_from_user (net/core/filter.c:1428)
do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)
do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
unreferenced object 0xffff888
---truncated---CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.24%
- Percentil entre todas las CVEs puntuadas: 14
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/29a69fa075d0577eff1137426669de21187ec182
- https://git.kernel.org/stable/c/5b81f0c6c60e35bf8153230ddfb03ebb14e17986
- https://git.kernel.org/stable/c/a1140cb215fa13dcec06d12ba0c3ee105633b7c4
- https://git.kernel.org/stable/c/a31a647a3d1073a642c5bbe3457731fb353cb980
- https://git.kernel.org/stable/c/d4a895e924b486f2a38463114509e1088ef4d7f5
JSON original (NVD)
Mostrar
{
"id": "CVE-2022-50661",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3a15fb6ed92cb32b0a83f406aa4a96f28c9adbc3",
"lessThan": "d4a895e924b486f2a38463114509e1088ef4d7f5",
"versionType": "git"
},
{
"status": "affected",
"version": "3a15fb6ed92cb32b0a83f406aa4a96f28c9adbc3",
"lessThan": "a31a647a3d1073a642c5bbe3457731fb353cb980",
"versionType": "git"
},
{
"status": "affected",
"version": "3a15fb6ed92cb32b0a83f406aa4a96f28c9adbc3",
"lessThan": "29a69fa075d0577eff1137426669de21187ec182",
"versionType": "git"
},
{
"status": "affected",
"version": "3a15fb6ed92cb32b0a83f406aa4a96f28c9adbc3",
"lessThan": "5b81f0c6c60e35bf8153230ddfb03ebb14e17986",
"versionType": "git"
},
{
"status": "affected",
"version": "3a15fb6ed92cb32b0a83f406aa4a96f28c9adbc3",
"lessThan": "a1140cb215fa13dcec06d12ba0c3ee105633b7c4",
"versionType": "git"
}
],
"programFiles": [
"kernel/fork.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.180",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.86",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.0.16",
"versionType": "semver",
"lessThanOrEqual": "6.0.*"
},
{
"status": "unaffected",
"version": "6.1.2",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/fork.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-09T16:17:17.757",
"references": [
{
"url": "https://git.kernel.org/stable/c/29a69fa075d0577eff1137426669de21187ec182",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5b81f0c6c60e35bf8153230ddfb03ebb14e17986",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a1140cb215fa13dcec06d12ba0c3ee105633b7c4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a31a647a3d1073a642c5bbe3457731fb353cb980",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d4a895e924b486f2a38463114509e1088ef4d7f5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nseccomp: Move copy_seccomp() to no failure path.\n\nOur syzbot instance reported memory leaks in do_seccomp() [0], similar\nto the report [1]. It shows that we miss freeing struct seccomp_filter\nand some objects included in it.\n\nWe can reproduce the issue with the program below [2] which calls one\nseccomp() and two clone() syscalls.\n\nThe first clone()d child exits earlier than its parent and sends a\nsignal to kill it during the second clone(), more precisely before the\nfatal_signal_pending() test in copy_process(). When the parent receives\nthe signal, it has to destroy the embryonic process and return -EINTR to\nuser space. In the failure path, we have to call seccomp_filter_release()\nto decrement the filter's refcount.\n\nInitially, we called it in free_task() called from the failure path, but\nthe commit 3a15fb6ed92c (\"seccomp: release filter after task is fully\ndead\") moved it to release_task() to notify user space as early as possible\nthat the filter is no longer used.\n\nTo keep the change and current seccomp refcount semantics, let's move\ncopy_seccomp() just after the signal check and add a WARN_ON_ONCE() in\nfree_task() for future debugging.\n\n[0]:\nunreferenced object 0xffff8880063add00 (size 256):\n comm \"repro_seccomp\", pid 230, jiffies 4294687090 (age 9.914s)\n hex dump (first 32 bytes):\n 01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................\n ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................\n backtrace:\n do_seccomp (./include/linux/slab.h:600 ./include/linux/slab.h:733 kernel/seccomp.c:666 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)\n do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)\nunreferenced object 0xffffc90000035000 (size 4096):\n comm \"repro_seccomp\", pid 230, jiffies 4294687090 (age 9.915s)\n hex dump (first 32 bytes):\n 01 00 00 00 00 00 00 00 00 00 00 00 05 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n __vmalloc_node_range (mm/vmalloc.c:3226)\n __vmalloc_node (mm/vmalloc.c:3261 (discriminator 4))\n bpf_prog_alloc_no_stats (kernel/bpf/core.c:91)\n bpf_prog_alloc (kernel/bpf/core.c:129)\n bpf_prog_create_from_user (net/core/filter.c:1414)\n do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)\n do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)\nunreferenced object 0xffff888003fa1000 (size 1024):\n comm \"repro_seccomp\", pid 230, jiffies 4294687090 (age 9.915s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n bpf_prog_alloc_no_stats (./include/linux/slab.h:600 ./include/linux/slab.h:733 kernel/bpf/core.c:95)\n bpf_prog_alloc (kernel/bpf/core.c:129)\n bpf_prog_create_from_user (net/core/filter.c:1414)\n do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)\n do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)\nunreferenced object 0xffff888006360240 (size 16):\n comm \"repro_seccomp\", pid 230, jiffies 4294687090 (age 9.915s)\n hex dump (first 16 bytes):\n 01 00 37 00 76 65 72 6c e0 83 01 06 80 88 ff ff ..7.verl........\n backtrace:\n bpf_prog_store_orig_filter (net/core/filter.c:1137)\n bpf_prog_create_from_user (net/core/filter.c:1428)\n do_seccomp (kernel/seccomp.c:671 kernel/seccomp.c:708 kernel/seccomp.c:1871 kernel/seccomp.c:1991)\n do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)\nunreferenced object 0xffff888\n---truncated---"
}
],
"lastModified": "2026-06-17T05:23:57.167",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}