{"id":"CVE-2026-90270","state":"PUBLISHED","title":"arm_mpam: Disable driver unbind to avoid UAF","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narm_mpam: Disable driver unbind to avoid UAF\n\nWhen a user unbinds an MSC and that MSC is the only MSC left for a\ncomponent then the corresponding mpam_component will be freed. If the user\nthen goes on to read the schemata file in the resctrl filesystem then the\nmpam_component will be accessed from resctrl_arch_get_config() leading to a\nuse after free.\n\nAs the MPAM driver is not a module the unbind sysfs interface is the only\nway to trigger the remove. Instead of dealing with the complexity of\nallowing some unused MSC to unbind just remove the unbind sysfs interface.","publishedAt":"2026-09-17T16:08:04.648Z","updatedAt":"2026-10-19T09:00:47.928Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f04046f2577a5c76167333ca99d3903ee5331ba0","status":"affected","lessThan":"7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2","versionType":"git"},{"version":"f04046f2577a5c76167333ca99d3903ee5331ba0","status":"affected","lessThan":"bb1a0f582d519c0461b0940116e2b52c5ba31459","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/resctrl/mpam_devices.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/resctrl/mpam_devices.c"]}],"references":["https://git.kernel.org/stable/c/7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2","https://git.kernel.org/stable/c/bb1a0f582d519c0461b0940116e2b52c5ba31459"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90270.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90270","state":"PUBLISHED","datePublished":"2026-09-17T16:08:04.648Z","dateUpdated":"2026-10-19T09:00:47.928Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.797Z"},"containers":{"cna":{"title":"arm_mpam: Disable driver unbind to avoid UAF","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\narm_mpam: Disable driver unbind to avoid UAF\n\nWhen a user unbinds an MSC and that MSC is the only MSC left for a\ncomponent then the corresponding mpam_component will be freed. If the user\nthen goes on to read the schemata file in the resctrl filesystem then the\nmpam_component will be accessed from resctrl_arch_get_config() leading to a\nuse after free.\n\nAs the MPAM driver is not a module the unbind sysfs interface is the only\nway to trigger the remove. Instead of dealing with the complexity of\nallowing some unused MSC to unbind just remove the unbind sysfs interface."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f04046f2577a5c76167333ca99d3903ee5331ba0","status":"affected","lessThan":"7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2","versionType":"git"},{"version":"f04046f2577a5c76167333ca99d3903ee5331ba0","status":"affected","lessThan":"bb1a0f582d519c0461b0940116e2b52c5ba31459","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/resctrl/mpam_devices.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/resctrl/mpam_devices.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2"},{"url":"https://git.kernel.org/stable/c/bb1a0f582d519c0461b0940116e2b52c5ba31459"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:00:47.928Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}