{"id":"CVE-2026-72181","state":"PUBLISHED","title":"mips: sched: Fix CPUMASK_OFFSTACK memory corruption","description":"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.","publishedAt":"2026-08-15T05:53:44.453Z","updatedAt":"2026-08-19T16:36:28.810Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"2f7730c03a9deea3ba7a1c980070d363b4ea2046","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"d20ee42f8226607b5693b2bc2f115ca2d270221a","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"15ba8053fe4162c933855f1676fb321cdb6251c7","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"3446ffb5d03c36f9ce88ede7ca5be319a2968d96","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"87a56c1e8e36d06ebe8640432f911538ded7827d","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"1caee6e084a96ada94658f261ced377d85af3f03","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"98e37db4a34d3af3fb2f4648295c25b5e40b20e3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/mips/kernel/mips-mt-fpaff.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.23","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.23","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/mips/kernel/mips-mt-fpaff.c"]}],"references":["https://git.kernel.org/stable/c/2f7730c03a9deea3ba7a1c980070d363b4ea2046","https://git.kernel.org/stable/c/d20ee42f8226607b5693b2bc2f115ca2d270221a","https://git.kernel.org/stable/c/15ba8053fe4162c933855f1676fb321cdb6251c7","https://git.kernel.org/stable/c/3446ffb5d03c36f9ce88ede7ca5be319a2968d96","https://git.kernel.org/stable/c/87a56c1e8e36d06ebe8640432f911538ded7827d","https://git.kernel.org/stable/c/1caee6e084a96ada94658f261ced377d85af3f03","https://git.kernel.org/stable/c/a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c","https://git.kernel.org/stable/c/98e37db4a34d3af3fb2f4648295c25b5e40b20e3"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72181.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72181","state":"PUBLISHED","datePublished":"2026-08-15T05:53:44.453Z","dateUpdated":"2026-08-19T16:36:28.810Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.910Z"},"containers":{"cna":{"title":"mips: sched: Fix CPUMASK_OFFSTACK memory corruption","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"2f7730c03a9deea3ba7a1c980070d363b4ea2046","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"d20ee42f8226607b5693b2bc2f115ca2d270221a","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"15ba8053fe4162c933855f1676fb321cdb6251c7","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"3446ffb5d03c36f9ce88ede7ca5be319a2968d96","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"87a56c1e8e36d06ebe8640432f911538ded7827d","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"1caee6e084a96ada94658f261ced377d85af3f03","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c","versionType":"git"},{"version":"295cbf6d63165fe4253cf1d9ceadcda47a318b48","status":"affected","lessThan":"98e37db4a34d3af3fb2f4648295c25b5e40b20e3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/mips/kernel/mips-mt-fpaff.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.23","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.23","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/mips/kernel/mips-mt-fpaff.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:36:28.810Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}