CVE-2026-99136 (GCVE-0-2026-99136)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-28 10:34
VLAI
Title
dm-crypt: fix a tiny race condition in crypt_dec_pending
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b35f8caa0890169000fec22902290d9a15274cbd , < ac5d887ab93592fc5e3605fe30c1d8d232d609b3 (git)
Affected: b35f8caa0890169000fec22902290d9a15274cbd , < 4f16bb982b27b9f5a15301f622c318001fe521f8 (git)
Affected: b35f8caa0890169000fec22902290d9a15274cbd , < 148845aa1921d95ef5dc851c76e6a284f6657df6 (git)
Affected: 9c8f3fcd3ffd3283cc0971c8919058356f20a963 (git)
Affected: 2.6.28.9 , < 2.6.29 (semver)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm-crypt.c"
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          "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."
        }
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      "providerMetadata": {
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    "dateReserved": "2026-09-25T10:25:14.395Z",
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    "state": "PUBLISHED"
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      "percentile": "0.05898"
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            "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."
          }
        ],
        "id": "CVE-2026-99136",
        "lastModified": "2026-10-28T11:17:33.513",
        "metrics": {},
        "published": "2026-10-28T11:17:33.513",
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        "vulnStatus": "Received"
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}



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