CVE-2026-72181 (GCVE-0-2026-72181)
Vulnerability from cvelistv5
Published
2026-08-15 05:53
Modified
2026-08-19 16:36
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
mips: sched: Fix CPUMASK_OFFSTACK memory corruption
This patch addresses a critical memory management flaw. When
CONFIG_CPUMASK_OFFSTACK is enabled, cpumask_var_t is a pointer.
Consequently, sizeof(new_mask) evaluates to the pointer size, causing
copy_from_user() to clobber the mask pointer. Furthermore, the old
logic performed copy_from_user() before allocating the mask.
Fix this by allocating new_mask first. To handle variable-sized user
masks correctly, use cpumask_size() to truncate overly large user masks
or pad undersized masks with zeros before copying the data directly into
the allocated buffer.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 Version: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 Version: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 Version: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 Version: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 Version: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 Version: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 Version: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/mips/kernel/mips-mt-fpaff.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2f7730c03a9deea3ba7a1c980070d363b4ea2046",
"status": "affected",
"version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48",
"versionType": "git"
},
{
"lessThan": "d20ee42f8226607b5693b2bc2f115ca2d270221a",
"status": "affected",
"version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48",
"versionType": "git"
},
{
"lessThan": "15ba8053fe4162c933855f1676fb321cdb6251c7",
"status": "affected",
"version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48",
"versionType": "git"
},
{
"lessThan": "3446ffb5d03c36f9ce88ede7ca5be319a2968d96",
"status": "affected",
"version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48",
"versionType": "git"
},
{
"lessThan": "87a56c1e8e36d06ebe8640432f911538ded7827d",
"status": "affected",
"version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48",
"versionType": "git"
},
{
"lessThan": "1caee6e084a96ada94658f261ced377d85af3f03",
"status": "affected",
"version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48",
"versionType": "git"
},
{
"lessThan": "a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c",
"status": "affected",
"version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48",
"versionType": "git"
},
{
"lessThan": "98e37db4a34d3af3fb2f4648295c25b5e40b20e3",
"status": "affected",
"version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/mips/kernel/mips-mt-fpaff.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.23"
},
{
"lessThan": "2.6.23",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "2.6.23",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "2.6.23",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "2.6.23",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "2.6.23",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "2.6.23",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "2.6.23",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "2.6.23",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "2.6.23",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmips: sched: Fix CPUMASK_OFFSTACK memory corruption\n\nThis patch addresses a critical memory management flaw. When\nCONFIG_CPUMASK_OFFSTACK is enabled, cpumask_var_t is a pointer.\nConsequently, sizeof(new_mask) evaluates to the pointer size, causing\ncopy_from_user() to clobber the mask pointer. Furthermore, the old\nlogic performed copy_from_user() before allocating the mask.\n\nFix this by allocating new_mask first. To handle variable-sized user\nmasks correctly, use cpumask_size() to truncate overly large user masks\nor pad undersized masks with zeros before copying the data directly into\nthe allocated buffer."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires invoking the sched_setaffinity syscall on a MIPS o32 kernel; the vulnerable mipsmt_sys_sched_setaffinity handler is only wired into the o32 syscall table and is not reachable from remote network protocols.\nAC:L - On affected builds the attacker reliably triggers the flaw with a single sched_setaffinity syscall supplying a user buffer; no races, special victim state, or uncontrollable memory layout are required beyond calling the syscall with attacker-chosen mask bytes.\nPR:L - Any unprivileged local user can call sched_setaffinity; the corrupting copy_from_user runs before check_same_owner/CAP_SYS_NICE, and setting affinity on one\u0027s own process needs no special capabilities beyond normal local execution.\nUI:N - Exploitation requires only a direct sched_setaffinity syscall from the attacker; no victim interaction such as opening files, clicking links, or mounting filesystems is needed.\nS:U - The vulnerability corrupts kernel stack/scheduler state within the same kernel security domain; it does not cross a VM, container, or IOMMU boundary on its own.\nC:H - Misplaced copy_from_user clobbers a kernel stack pointer with attacker-controlled bytes, and the never-initialized kmalloc cpumask can be stored in user_cpus_allowed and leaked back to userspace via sched_getaffinity.\nI:H - The bug is a kernel memory corruption from writing attacker-controlled data to the wrong address (the cpumask pointer on the stack) before allocation, which is an out-of-bounds-style write primitive in kernel context.\nA:H - Kernel memory corruption in the sched_setaffinity path can cause oops, panic, or wedged scheduling/affinity state; corrupted stack data and misuse of uninitialized cpumask contents can crash or hang the system."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:36:28.810Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2f7730c03a9deea3ba7a1c980070d363b4ea2046"
},
{
"url": "https://git.kernel.org/stable/c/d20ee42f8226607b5693b2bc2f115ca2d270221a"
},
{
"url": "https://git.kernel.org/stable/c/15ba8053fe4162c933855f1676fb321cdb6251c7"
},
{
"url": "https://git.kernel.org/stable/c/3446ffb5d03c36f9ce88ede7ca5be319a2968d96"
},
{
"url": "https://git.kernel.org/stable/c/87a56c1e8e36d06ebe8640432f911538ded7827d"
},
{
"url": "https://git.kernel.org/stable/c/1caee6e084a96ada94658f261ced377d85af3f03"
},
{
"url": "https://git.kernel.org/stable/c/a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c"
},
{
"url": "https://git.kernel.org/stable/c/98e37db4a34d3af3fb2f4648295c25b5e40b20e3"
}
],
"title": "mips: sched: Fix CPUMASK_OFFSTACK memory corruption",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72181",
"datePublished": "2026-08-15T05:53:44.453Z",
"dateReserved": "2026-08-09T03:40:39.910Z",
"dateUpdated": "2026-08-19T16:36:28.810Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…