{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72181", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.910Z", "datePublished": "2026-08-15T05:53:44.453Z", "dateUpdated": "2026-08-19T16:36:28.810Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:36:28.810Z" }, "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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "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's 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/mips/kernel/mips-mt-fpaff.c" ], "versions": [ { "version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48", "lessThan": "2f7730c03a9deea3ba7a1c980070d363b4ea2046", "status": "affected", "versionType": "git" }, { "version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48", "lessThan": "d20ee42f8226607b5693b2bc2f115ca2d270221a", "status": "affected", "versionType": "git" }, { "version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48", "lessThan": "15ba8053fe4162c933855f1676fb321cdb6251c7", "status": "affected", "versionType": "git" }, { "version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48", "lessThan": "3446ffb5d03c36f9ce88ede7ca5be319a2968d96", "status": "affected", "versionType": "git" }, { "version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48", "lessThan": "87a56c1e8e36d06ebe8640432f911538ded7827d", "status": "affected", "versionType": "git" }, { "version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48", "lessThan": "1caee6e084a96ada94658f261ced377d85af3f03", "status": "affected", "versionType": "git" }, { "version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48", "lessThan": "a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c", "status": "affected", "versionType": "git" }, { "version": "295cbf6d63165fe4253cf1d9ceadcda47a318b48", "lessThan": "98e37db4a34d3af3fb2f4648295c25b5e40b20e3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/mips/kernel/mips-mt-fpaff.c" ], "versions": [ { "version": "2.6.23", "status": "affected" }, { "version": "0", "lessThan": "2.6.23", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }