{"api_version":"1","generated_at":"2026-08-17T09:17:49+00:00","cve":"CVE-2026-72181","urls":{"html":"https://cve.report/CVE-2026-72181","api":"https://cve.report/api/cve/CVE-2026-72181.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72181","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72181"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:36","updated_at":"2026-08-17 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72181","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 295cbf6d63165fe4253cf1d9ceadcda47a318b48 d20ee42f8226607b5693b2bc2f115ca2d270221a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 295cbf6d63165fe4253cf1d9ceadcda47a318b48 15ba8053fe4162c933855f1676fb321cdb6251c7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 295cbf6d63165fe4253cf1d9ceadcda47a318b48 3446ffb5d03c36f9ce88ede7ca5be319a2968d96 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 295cbf6d63165fe4253cf1d9ceadcda47a318b48 87a56c1e8e36d06ebe8640432f911538ded7827d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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'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":{"dateUpdated":"2026-08-17T05:41:12.635Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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":"2026-08-17T05:41:12.635Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:36","lastModifiedDate":"2026-08-17 06:18:18","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72181","Ordinal":"1","Title":"mips: sched: Fix CPUMASK_OFFSTACK memory corruption","CVE":"CVE-2026-72181","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72181","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"mips: sched: Fix CPUMASK_OFFSTACK memory corruption"}]}}}