{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40348","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.187Z","datePublished":"2025-12-16T13:30:22.368Z","dateUpdated":"2026-05-11T21:47:37.835Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:47:37.835Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nslab: Avoid race on slab->obj_exts in alloc_slab_obj_exts\n\nIf two competing threads enter alloc_slab_obj_exts() and one of them\nfails to allocate the object extension vector, it might override the\nvalid slab->obj_exts allocated by the other thread with\nOBJEXTS_ALLOC_FAIL. This will cause the thread that lost this race and\nexpects a valid pointer to dereference a NULL pointer later on.\n\nUpdate slab->obj_exts atomically using cmpxchg() to avoid\nslab->obj_exts overrides by racing threads.\n\nThanks for Vlastimil and Suren's help with debugging."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/slub.c"],"versions":[{"version":"715b6a5b41dae39baeaa40d3386b548bb278b9c2","lessThan":"c7af5300d78460fc5037ddc77113ba3dbfe77dc0","status":"affected","versionType":"git"},{"version":"07e38a54cabd9b4de7ceb7f075f29ffa463e458a","lessThan":"7c34feda6a9a203c9744281f1b6671b7dad2012d","status":"affected","versionType":"git"},{"version":"f7381b9116407ba2a429977c80ff8df953ea9354","lessThan":"6ed8bfd24ce1cb31742b09a3eb557cd008533eec","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/slub.c"],"versions":[{"version":"6.12.54","lessThan":"6.12.56","status":"affected","versionType":"semver"},{"version":"6.17.4","lessThan":"6.17.6","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.54","versionEndExcluding":"6.12.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17.4","versionEndExcluding":"6.17.6"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c7af5300d78460fc5037ddc77113ba3dbfe77dc0"},{"url":"https://git.kernel.org/stable/c/7c34feda6a9a203c9744281f1b6671b7dad2012d"},{"url":"https://git.kernel.org/stable/c/6ed8bfd24ce1cb31742b09a3eb557cd008533eec"}],"title":"slab: Avoid race on slab->obj_exts in alloc_slab_obj_exts","x_generator":{"engine":"bippy-1.2.0"}}}}