{"id":"CVE-2026-89447","state":"PUBLISHED","title":"iommufd: Avoid locking internal accesses during unmap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Avoid locking internal accesses during unmap\n\niommufd_access_notify_unmap() skips internal accesses because they do\nnot have an external unmap callback to invoke.\n\nHowever, the current test calls iommufd_lock_obj() before checking\nwhether the access is internal. If iommufd_lock_obj() succeeds, the loop\nthen sees the internal access and continues, bypassing the matching\niommufd_put_object() used by the normal unmap path. This leaks the\nobject reference taken by iommufd_lock_obj().\n\nCheck for internal accesses first so skipped entries are never locked.","publishedAt":"2026-09-11T19:43:14.094Z","updatedAt":"2026-10-19T08:46:56.784Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0","status":"affected","lessThan":"436189ee4bb2c7c993b945d68570dd38c3e4349e","versionType":"git"},{"version":"27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0","status":"affected","lessThan":"50a66a63d1c841ae6b28a4551f642c1bba4c9529","versionType":"git"},{"version":"27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0","status":"affected","lessThan":"0dbcdf4473a614adbd732d567c9b39ac0e040e0c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/device.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","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/iommu/iommufd/device.c"]}],"references":["https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e","https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529","https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89447.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89447","state":"PUBLISHED","datePublished":"2026-09-11T19:43:14.094Z","dateUpdated":"2026-10-19T08:46:56.784Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.705Z"},"containers":{"cna":{"title":"iommufd: Avoid locking internal accesses during unmap","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Avoid locking internal accesses during unmap\n\niommufd_access_notify_unmap() skips internal accesses because they do\nnot have an external unmap callback to invoke.\n\nHowever, the current test calls iommufd_lock_obj() before checking\nwhether the access is internal. If iommufd_lock_obj() succeeds, the loop\nthen sees the internal access and continues, bypassing the matching\niommufd_put_object() used by the normal unmap path. This leaks the\nobject reference taken by iommufd_lock_obj().\n\nCheck for internal accesses first so skipped entries are never locked."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0","status":"affected","lessThan":"436189ee4bb2c7c993b945d68570dd38c3e4349e","versionType":"git"},{"version":"27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0","status":"affected","lessThan":"50a66a63d1c841ae6b28a4551f642c1bba4c9529","versionType":"git"},{"version":"27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0","status":"affected","lessThan":"0dbcdf4473a614adbd732d567c9b39ac0e040e0c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommufd/device.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","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/iommu/iommufd/device.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e"},{"url":"https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529"},{"url":"https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:46:56.784Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}