{"id":"CVE-2026-98245","state":"PUBLISHED","title":"btrfs: take commit root semaphore when iterating in mark_block_group_to_copy()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: take commit root semaphore when iterating in mark_block_group_to_copy()\n\nmark_block_group_to_copy() iterates over the commit root with\nskip_locking=true. A concurrent transaction commit can swap and free\nthe commit root during iteration, causing use-after-free when\naccessing extent buffers.\n\nFix it by using path->need_commit_sem to protect the commit root search.","publishedAt":"2026-10-06T08:45:14.758Z","updatedAt":"2026-10-30T12:37:57.233Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"90242b776df83f8b1ea901f80b568b4fc2318c61","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"bffe773f92885603db14047bba0f12089105929e","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"93a025166495c63ba5b8ac721c7040d5312e8335","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"8e2007b263ea250251ec3021a0a197da990ee1a8","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"709f6a5e986535005110c6c69b322f63631cb200","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"c32490c6d3f3a9f2d177d57c7eb8bbc347561d08","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"0594e3423f4ba3137c734371169491f9a98e9af4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/dev-replace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","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":["fs/btrfs/dev-replace.c"]}],"references":["https://git.kernel.org/stable/c/90242b776df83f8b1ea901f80b568b4fc2318c61","https://git.kernel.org/stable/c/bffe773f92885603db14047bba0f12089105929e","https://git.kernel.org/stable/c/93a025166495c63ba5b8ac721c7040d5312e8335","https://git.kernel.org/stable/c/8e2007b263ea250251ec3021a0a197da990ee1a8","https://git.kernel.org/stable/c/709f6a5e986535005110c6c69b322f63631cb200","https://git.kernel.org/stable/c/c32490c6d3f3a9f2d177d57c7eb8bbc347561d08","https://git.kernel.org/stable/c/0594e3423f4ba3137c734371169491f9a98e9af4"],"weaknesses":[],"ingestedAt":"2026-10-30T12:56:04.490Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98245.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98245","state":"PUBLISHED","datePublished":"2026-10-06T08:45:14.758Z","dateUpdated":"2026-10-30T12:37:57.233Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.330Z"},"containers":{"cna":{"title":"btrfs: take commit root semaphore when iterating in mark_block_group_to_copy()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: take commit root semaphore when iterating in mark_block_group_to_copy()\n\nmark_block_group_to_copy() iterates over the commit root with\nskip_locking=true. A concurrent transaction commit can swap and free\nthe commit root during iteration, causing use-after-free when\naccessing extent buffers.\n\nFix it by using path->need_commit_sem to protect the commit root search."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"90242b776df83f8b1ea901f80b568b4fc2318c61","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"bffe773f92885603db14047bba0f12089105929e","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"93a025166495c63ba5b8ac721c7040d5312e8335","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"8e2007b263ea250251ec3021a0a197da990ee1a8","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"709f6a5e986535005110c6c69b322f63631cb200","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"c32490c6d3f3a9f2d177d57c7eb8bbc347561d08","versionType":"git"},{"version":"78ce9fc269af6e69c1399ab910ba6bc81c934f67","status":"affected","lessThan":"0594e3423f4ba3137c734371169491f9a98e9af4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/dev-replace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","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":["fs/btrfs/dev-replace.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/90242b776df83f8b1ea901f80b568b4fc2318c61"},{"url":"https://git.kernel.org/stable/c/bffe773f92885603db14047bba0f12089105929e"},{"url":"https://git.kernel.org/stable/c/93a025166495c63ba5b8ac721c7040d5312e8335"},{"url":"https://git.kernel.org/stable/c/8e2007b263ea250251ec3021a0a197da990ee1a8"},{"url":"https://git.kernel.org/stable/c/709f6a5e986535005110c6c69b322f63631cb200"},{"url":"https://git.kernel.org/stable/c/c32490c6d3f3a9f2d177d57c7eb8bbc347561d08"},{"url":"https://git.kernel.org/stable/c/0594e3423f4ba3137c734371169491f9a98e9af4"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:37:57.233Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}