CVE-2026-99136 (GCVE-0-2026-99136)
Vulnerability from cvelistv5
Published
2026-10-28 10:34
Modified
2026-10-28 10:34
Severity ?
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.
Impacted products
Vendor Product Version
Linux Linux Version: b35f8caa0890169000fec22902290d9a15274cbd
Version: b35f8caa0890169000fec22902290d9a15274cbd
Version: b35f8caa0890169000fec22902290d9a15274cbd
Version: 9c8f3fcd3ffd3283cc0971c8919058356f20a963
Version: 2.6.28.9   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm-crypt.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          ]
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          "product": "Linux",
          "programFiles": [
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.29"
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              "version": "7.2.13",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
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                  "vulnerable": true
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                {
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              ],
              "negate": false,
              "operator": "OR"
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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": [
        {
          "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"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "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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