CVE-2026-74399

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: evm: terminate and bound the evm_xattrs read buffer evm_read_xattrs() allocates size + 1 bytes, fills them from the list of enabled xattrs, and then passes strlen(temp) to simple_read_from_buffer(). When no configured xattrs are enabled, the fill loop stores nothing and temp[0] remains uninitialized, so strlen() reads beyond initialized memory. Explicitly terminate the buffer after allocation, use snprintf() for each formatted line, and pass the accumulated length, without risk of truncation, to simple_read_from_buffer().

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

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

Published

2026-08-15 06:22:41.917000

Last modified

2026-11-06 17:19:47.673000

View original CVE JSON

{
  "id": "CVE-2026-74399",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-15T06:22:41.917",
  "lastModified": "2026-11-06T17:19:47.673",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nevm: terminate and bound the evm_xattrs read buffer\n\nevm_read_xattrs() allocates size + 1 bytes, fills them from the list of\nenabled xattrs, and then passes strlen(temp) to\nsimple_read_from_buffer(). When no configured xattrs are enabled, the\nfill loop stores nothing and temp[0] remains uninitialized, so strlen()\nreads beyond initialized memory.\n\nExplicitly terminate the buffer after allocation, use snprintf() for\neach formatted line, and pass the accumulated length, without risk of\ntruncation, to simple_read_from_buffer()."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "security/integrity/evm/evm_secfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1",
              "lessThan": "8df81954d22a653a8b01d46692cd56f71137269b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1",
              "lessThan": "0b9f8282b40af4a99d6243d2cb939d14ff36b049",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1",
              "lessThan": "a36cbfb85f26e6c6fb6529b1a364331b94dc88f3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1",
              "lessThan": "12ad52dc45a0c8c9d25e85b4a84201de4c5420ed",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1",
              "lessThan": "a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1",
              "lessThan": "38b7d63b23aa9d2ddde7688040e9426d32be4065",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fa516b66a1bfce1d72f1620c54bdfebc493000d1",
              "lessThan": "11143a19f5b8dc8f414deab87571134f9f447313",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "security/integrity/evm/evm_secfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4.18",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "4.18",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.212",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.178",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.145",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.97",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.40",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.5",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-11-06T16:56:55.812669Z",
          "id": "CVE-2026-74399",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0b9f8282b40af4a99d6243d2cb939d14ff36b049",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/11143a19f5b8dc8f414deab87571134f9f447313",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/12ad52dc45a0c8c9d25e85b4a84201de4c5420ed",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/38b7d63b23aa9d2ddde7688040e9426d32be4065",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8df81954d22a653a8b01d46692cd56f71137269b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a36cbfb85f26e6c6fb6529b1a364331b94dc88f3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}