CVE-2022-50569 (GCVE-0-2022-50569)
Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2025-12-23 13:30
VLAI?
Title
xfrm: Update ipcomp_scratches with NULL when freed
Summary
In the Linux kernel, the following vulnerability has been resolved:
xfrm: Update ipcomp_scratches with NULL when freed
Currently if ipcomp_alloc_scratches() fails to allocate memory
ipcomp_scratches holds obsolete address. So when we try to free the
percpu scratches using ipcomp_free_scratches() it tries to vfree non
existent vm area. Described below:
static void * __percpu *ipcomp_alloc_scratches(void)
{
...
scratches = alloc_percpu(void *);
if (!scratches)
return NULL;
ipcomp_scratches does not know about this allocation failure.
Therefore holding the old obsolete address.
...
}
So when we free,
static void ipcomp_free_scratches(void)
{
...
scratches = ipcomp_scratches;
Assigning obsolete address from ipcomp_scratches
if (!scratches)
return;
for_each_possible_cpu(i)
vfree(*per_cpu_ptr(scratches, i));
Trying to free non existent page, causing warning: trying to vfree
existent vm area.
...
}
Fix this breakage by updating ipcomp_scrtches with NULL when scratches
is freed
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < debca61df6bc2f65e020656c9c5b878d6b38d30f
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a39f456d62810c0efb43cead22f98d95b53e4b1a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1e8abde895b3ac6a368cbdb372e8800c49e73a28 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 18373ed500f7cd53e24d9b0bd0f1c09d78dba87e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < be81c44242b20fc3bdcc73480ef8aaee56f5d0b6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 03155680191ef0f004b1d6a5714c5b8cd271ab61 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3bdba4440d82e0da2b1bfc35d3836c8a8e00677 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2c19945ce8095d065df550e7fe350cd5cc40c6e6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8a04d2fc700f717104bfb95b0f6694e448a4537f (git) |
|||||||
|
|||||||||
{
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{
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"product": "Linux",
"programFiles": [
"net/xfrm/xfrm_ipcomp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/xfrm/xfrm_ipcomp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"lessThan": "2.6.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.331",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.296",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.262",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.220",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.150",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.75",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.19.*",
"status": "unaffected",
"version": "5.19.17",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.0.*",
"status": "unaffected",
"version": "6.0.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
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},
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{
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},
{
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{
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{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Update ipcomp_scratches with NULL when freed\n\nCurrently if ipcomp_alloc_scratches() fails to allocate memory\nipcomp_scratches holds obsolete address. So when we try to free the\npercpu scratches using ipcomp_free_scratches() it tries to vfree non\nexistent vm area. Described below:\n\nstatic void * __percpu *ipcomp_alloc_scratches(void)\n{\n ...\n scratches = alloc_percpu(void *);\n if (!scratches)\n return NULL;\nipcomp_scratches does not know about this allocation failure.\nTherefore holding the old obsolete address.\n ...\n}\n\nSo when we free,\n\nstatic void ipcomp_free_scratches(void)\n{\n ...\n scratches = ipcomp_scratches;\nAssigning obsolete address from ipcomp_scratches\n\n if (!scratches)\n return;\n\n for_each_possible_cpu(i)\n vfree(*per_cpu_ptr(scratches, i));\nTrying to free non existent page, causing warning: trying to vfree\nexistent vm area.\n ...\n}\n\nFix this breakage by updating ipcomp_scrtches with NULL when scratches\nis freed"
}
],
"providerMetadata": {
"dateUpdated": "2025-12-23T13:30:04.165Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/debca61df6bc2f65e020656c9c5b878d6b38d30f"
},
{
"url": "https://git.kernel.org/stable/c/a39f456d62810c0efb43cead22f98d95b53e4b1a"
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{
"url": "https://git.kernel.org/stable/c/1e8abde895b3ac6a368cbdb372e8800c49e73a28"
},
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"url": "https://git.kernel.org/stable/c/18373ed500f7cd53e24d9b0bd0f1c09d78dba87e"
},
{
"url": "https://git.kernel.org/stable/c/be81c44242b20fc3bdcc73480ef8aaee56f5d0b6"
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{
"url": "https://git.kernel.org/stable/c/03155680191ef0f004b1d6a5714c5b8cd271ab61"
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{
"url": "https://git.kernel.org/stable/c/f3bdba4440d82e0da2b1bfc35d3836c8a8e00677"
},
{
"url": "https://git.kernel.org/stable/c/2c19945ce8095d065df550e7fe350cd5cc40c6e6"
},
{
"url": "https://git.kernel.org/stable/c/8a04d2fc700f717104bfb95b0f6694e448a4537f"
}
],
"title": "xfrm: Update ipcomp_scratches with NULL when freed",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-50569",
"datePublished": "2025-10-22T13:23:25.810Z",
"dateReserved": "2025-10-22T13:20:23.760Z",
"dateUpdated": "2025-12-23T13:30:04.165Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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