CVE-2026-99135

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: fix infinite loop on discard with large tag size When integrity_metadata handles a discard, it fills a buffer with DISCARD_FILLER and writes it over the tags, max_blocks blocks at a time. If the kmalloc fails, the buffer is the on-stack array checksums_onstack and max_size is set to HASH_MAX_DIGESTSIZE. So if the tag size is larger than HASH_MAX_DIGESTSIZE, max_blocks is zero, bi_size is never decremented and the loop never terminates. Fix this by using sizeof(checksums_onstack) as max_size. The array has MAX_TAG_SIZE bytes since commit b93b6643e9b5 ("dm integrity: fix a crash with unusually large tag size"), so max_blocks is at least 1.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

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

Published

2026-10-28 11:17:33.400000

Last modified

2026-10-28 11:17:33.400000

View original CVE JSON

{
  "id": "CVE-2026-99135",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-28T11:17:33.400",
  "lastModified": "2026-10-28T11:17:33.400",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: fix infinite loop on discard with large tag size\n\nWhen integrity_metadata handles a discard, it fills a buffer with\nDISCARD_FILLER and writes it over the tags, max_blocks blocks at a\ntime. If the kmalloc fails, the buffer is the on-stack array\nchecksums_onstack and max_size is set to HASH_MAX_DIGESTSIZE. So if the\ntag size is larger than HASH_MAX_DIGESTSIZE, max_blocks is zero, bi_size\nis never decremented and the loop never terminates.\n\nFix this by using sizeof(checksums_onstack) as max_size. The array has\nMAX_TAG_SIZE bytes since commit b93b6643e9b5 (\"dm integrity: fix a\ncrash with unusually large tag size\"), so max_blocks is at least 1."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/md/dm-integrity.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "84597a44a9d86ac949900441cea7da0af0f2f473",
              "lessThan": "fc512700f1413fed652dac22fa1c4e837210b9c0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "84597a44a9d86ac949900441cea7da0af0f2f473",
              "lessThan": "251b44b424920df9204e88a81fb3f78fa48ddd99",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "84597a44a9d86ac949900441cea7da0af0f2f473",
              "lessThan": "18d80c77b4c7dd20699e81cedfbbff4e9d198f28",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/md/dm-integrity.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.7",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.7",
              "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/18d80c77b4c7dd20699e81cedfbbff4e9d198f28",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/251b44b424920df9204e88a81fb3f78fa48ddd99",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fc512700f1413fed652dac22fa1c4e837210b9c0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}