CVE-2026-99136

Full vulnerability record from the local CVENow database.

Description

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

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-28 11:17:33.513000

Last modified

2026-10-28 11:17:33.513000

View original CVE JSON

{
  "id": "CVE-2026-99136",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-28T11:17:33.513",
  "lastModified": "2026-10-28T11:17:33.513",
  "vulnStatus": "Received",
  "cveTags": [],
  "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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/md/dm-crypt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "b35f8caa0890169000fec22902290d9a15274cbd",
              "lessThan": "ac5d887ab93592fc5e3605fe30c1d8d232d609b3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b35f8caa0890169000fec22902290d9a15274cbd",
              "lessThan": "4f16bb982b27b9f5a15301f622c318001fe521f8",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b35f8caa0890169000fec22902290d9a15274cbd",
              "lessThan": "148845aa1921d95ef5dc851c76e6a284f6657df6",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9c8f3fcd3ffd3283cc0971c8919058356f20a963",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "2.6.28.9",
              "lessThan": "2.6.29",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/md/dm-crypt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "2.6.29",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "2.6.29",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.59",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.13",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/148845aa1921d95ef5dc851c76e6a284f6657df6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4f16bb982b27b9f5a15301f622c318001fe521f8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ac5d887ab93592fc5e3605fe30c1d8d232d609b3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}