{ "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" } } } }