{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99136","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.395Z","datePublished":"2026-10-28T10:34:48.558Z","dateUpdated":"2026-10-31T12:43:39.281Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-31T12:43:39.281Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-crypt: fix a tiny race condition in crypt_dec_pending\n\ncrypt_dec_pending reads io->error before calling atomic_dec_and_test.\nAnother context, for example crypt_endio called from an interrupt, may\nset io->error and drop its reference between the read and the\ndecrement. crypt_dec_pending then drops the last reference and completes\nthe bio with the stale status - so a read that failed and was never\ndecrypted, or a write that failed, is reported as successful.\n\nThe read was placed before the decrement by commit b35f8caa0890 (\"dm\ncrypt: wait for endio to complete before destruction\"), because that\ncommit freed dm_crypt_io before calling bio_endio. This is no longer the\ncase, dm_crypt_io lives in the per-bio data now.\n\nRead io->error after atomic_dec_and_test instead. atomic_dec_and_test is\nfully ordered, so no additional barrier is needed."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - A local read(2) or write(2) on a file on an existing dm-crypt volume follows vfs_read/vfs_write through the filesystem, submit_bio(), dm_submit_bio(), crypt_map(), and patched crypt_dec_pending(); no network message supplies the failed bio or stale status.\nAC:H - Exploitation needs a lower read/write or crypto operation to fail and its crypt_endio() error store/decrement to land between crypt_dec_pending()'s error load and atomic decrement. The caller can repeat I/O but cannot ordinarily induce the device failure or interrupt timing, so it does not control both sides.\nPR:L - An unprivileged user with ordinary read or write permission on a file backed by the mapped volume reaches crypt_map(); vfs_read/vfs_write gate this with the open mode and security_file_permission(), not a capability. CAP_SYS_ADMIN in ctl_ioctl() gates creating the dm table, not I/O on an existing mapping.\nUI:N - The attacker issues the read/write and can evict their readable file pages or repeat I/O themselves; no second user must open a file, mount attacker-supplied media, or approve an action.\nS:U - crypt_dec_pending() misreports completion of a host-kernel bio to the same host filesystem/block stack; it crosses no VM, IOMMU, or separate security-authority boundary.\nC:H - For buffered reads, stale success makes ext4 mpage_end_io()->__read_end_io() mark a fresh filemap_alloc_folio(GFP_HIGHUSER_MOVABLE) folio uptodate although the failed read never filled or decrypted it; filemap_read() then copy_folio_to_iter() exposes prior physical-page contents.\nI:H - For writes, stale success makes ext4_end_bio() and JBD2 journal_end_buffer_io_sync() skip their error paths and accept failed data, metadata, or commit-record bios as durable. This can silently lose updates and leave the encrypted filesystem persistently inconsistent.\nA:H - Because the false status prevents ext4/JBD2 from recording the I/O error or aborting the journal, continued operation after failed metadata or commit writes can leave the volume unusable; false-success metadata reads can likewise install random buffers as valid."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-crypt.c"],"versions":[{"version":"b35f8caa0890169000fec22902290d9a15274cbd","lessThan":"445a6883f46d3ab1ff545199a8cc1d5834936d3f","status":"affected","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","lessThan":"6f82e86471c92fd874f2630c9a6af887f4ed1a77","status":"affected","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","lessThan":"6ac8546df1f8a2b1ca7f6d67c269057a99fbbf8c","status":"affected","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","lessThan":"056bf8322e39a48026df352d6227ec03dd8cd032","status":"affected","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","lessThan":"d9d7069bb79139271b54dc477f07e242c445de6b","status":"affected","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","lessThan":"ac5d887ab93592fc5e3605fe30c1d8d232d609b3","status":"affected","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","lessThan":"4f16bb982b27b9f5a15301f622c318001fe521f8","status":"affected","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","lessThan":"148845aa1921d95ef5dc851c76e6a284f6657df6","status":"affected","versionType":"git"},{"version":"9c8f3fcd3ffd3283cc0971c8919058356f20a963","status":"affected","versionType":"git"},{"version":"2.6.28.9","lessThan":"2.6.29","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-crypt.c"],"versions":[{"version":"2.6.29","status":"affected"},{"version":"0","lessThan":"2.6.29","status":"unaffected","versionType":"semver"},{"version":"5.10.273","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.224","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.191","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.161","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.115","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.59","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.13","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.6.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.12.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/445a6883f46d3ab1ff545199a8cc1d5834936d3f"},{"url":"https://git.kernel.org/stable/c/6f82e86471c92fd874f2630c9a6af887f4ed1a77"},{"url":"https://git.kernel.org/stable/c/6ac8546df1f8a2b1ca7f6d67c269057a99fbbf8c"},{"url":"https://git.kernel.org/stable/c/056bf8322e39a48026df352d6227ec03dd8cd032"},{"url":"https://git.kernel.org/stable/c/d9d7069bb79139271b54dc477f07e242c445de6b"},{"url":"https://git.kernel.org/stable/c/ac5d887ab93592fc5e3605fe30c1d8d232d609b3"},{"url":"https://git.kernel.org/stable/c/4f16bb982b27b9f5a15301f622c318001fe521f8"},{"url":"https://git.kernel.org/stable/c/148845aa1921d95ef5dc851c76e6a284f6657df6"}],"title":"dm-crypt: fix a tiny race condition in crypt_dec_pending","x_generator":{"engine":"bippy-1.2.0"}}}}