CVE-2026-99136 (GCVE-0-2026-99136)
Vulnerability from cvelistv5
Published
2026-10-28 10:34
Modified
2026-10-28 10:34
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
dm-crypt: fix a tiny race condition in crypt_dec_pending
crypt_dec_pending reads io->error before calling atomic_dec_and_test.
Another context, for example crypt_endio called from an interrupt, may
set io->error and drop its reference between the read and the
decrement. crypt_dec_pending then drops the last reference and completes
the bio with the stale status - so a read that failed and was never
decrypted, or a write that failed, is reported as successful.
The read was placed before the decrement by commit b35f8caa0890 ("dm
crypt: wait for endio to complete before destruction"), because that
commit freed dm_crypt_io before calling bio_endio. This is no longer the
case, dm_crypt_io lives in the per-bio data now.
Read io->error after atomic_dec_and_test instead. atomic_dec_and_test is
fully ordered, so no additional barrier is needed.
References
Impacted products
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
"drivers/md/dm-crypt.c"
],
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"vendor": "Linux",
"versions": [
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"versions": [
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{
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"status": "unaffected",
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"cpeApplicability": [
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],
"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-\u003eerror before calling atomic_dec_and_test.\nAnother context, for example crypt_endio called from an interrupt, may\nset io-\u003eerror 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-\u003eerror after atomic_dec_and_test instead. atomic_dec_and_test is\nfully ordered, so no additional barrier is needed."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-28T10:34:48.558Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"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": {
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"cveId": "CVE-2026-99136",
"datePublished": "2026-10-28T10:34:48.558Z",
"dateReserved": "2026-09-25T10:25:14.395Z",
"dateUpdated": "2026-10-28T10:34:48.558Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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