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CVE-2026-31458 mm/damon/sysfs: check contexts->nr before accessing contexts_arr[0]

🗓️ 22 Apr 2026 13:53:50Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 23 Views

Kernel vulnerability in damon sysfs allows NULL dereference when contexts_nr is zero; guard commands at damon_sysfs_handle_cmd().

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "mm/damon/sysfs.c"
    ],
    "versions": [
      {
        "version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7",
        "lessThan": "aba546061341b56e9ffb37e1eb661a3628b6ec12",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7",
        "lessThan": "1e8da792672481d603fa7cd0d815577220a3ee27",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7",
        "lessThan": "708033c231bd782858f4ddbb46ee874a5a5fbdab",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7",
        "lessThan": "bbe03ad3fb9e714191757ca7b41582f930be7be2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0ac32b8affb5a384253dbb8339bd2d0e91add0b7",
        "lessThan": "1bfe9fb5ed2667fb075682408b776b5273162615",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "mm/damon/sysfs.c"
    ],
    "versions": [
      {
        "version": "5.18",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.18",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.131",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.80",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.21",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.11",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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