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vuln-cve/data/2026/99xxx/CVE-2026-99136.json
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{
"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": [
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"lessThan": "445a6883f46d3ab1ff545199a8cc1d5834936d3f",
"status": "affected",
"versionType": "git"
},
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"lessThan": "6f82e86471c92fd874f2630c9a6af887f4ed1a77",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "6ac8546df1f8a2b1ca7f6d67c269057a99fbbf8c",
"status": "affected",
"versionType": "git"
},
{
"version": "b35f8caa0890169000fec22902290d9a15274cbd",
"lessThan": "056bf8322e39a48026df352d6227ec03dd8cd032",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "d9d7069bb79139271b54dc477f07e242c445de6b",
"status": "affected",
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"status": "affected",
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{
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"lessThan": "4f16bb982b27b9f5a15301f622c318001fe521f8",
"status": "affected",
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},
{
"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"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "7.3"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.28.9"
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],
"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"
}
}
}
}
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