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CVE-2026-31458

🗓️ 22 Apr 2026 13:53:50Reported by LinuxType 
cve
 cve
🔗 web.nvd.nist.gov👁 22 Views🌐 WEB

CVE-2026-31458: DAMON sysfs dereferences contexts_arr[0] when nr_contexts is zero, causing NULL pointer dereference.

Related
Detection
Affected
Refs
Paths
NVD
Vulners
CNA
Node
OR
linuxlinux_kernelRange5.186.6.131
linuxlinux_kernelRange6.76.12.80
linuxlinux_kernelRange6.136.18.21
linuxlinux_kernelRange6.196.19.11
[
  {
    "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"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
nr_contextspath/sys/kernel/mm/damon/admin/kdamonds/0/contexts/nr_contextsSysfs path where an attacker can set nr_contexts to 0, leading to NULL pointer dereference when subsequent commands access contexts_arr[0].CWE-476
update_schemes_statspath/sys/kernel/mm/damon/admin/kdamonds/0/stateSysfs state file commands that dereference contexts_arr[0] if contexts_nr is not properly validated, enabling NULL pointer dereference vulnerability.CWE-476
update_schemes_tried_regionspath/sys/kernel/mm/damon/admin/kdamonds/0/stateSysfs state file commands that dereference contexts_arr[0] if contexts_nr is not properly validated, enabling NULL pointer dereference vulnerability.CWE-476
update_schemes_tried_bytespath/sys/kernel/mm/damon/admin/kdamonds/0/stateSysfs state file commands that dereference contexts_arr[0] if contexts_nr is not properly validated, enabling NULL pointer dereference vulnerability.CWE-476
update_schemes_effective_quotaspath/sys/kernel/mm/damon/admin/kdamonds/0/stateSysfs state file commands that dereference contexts_arr[0] if contexts_nr is not properly validated, enabling NULL pointer dereference vulnerability.CWE-476
update_tuned_intervalspath/sys/kernel/mm/damon/admin/kdamonds/0/stateSysfs state file commands that dereference contexts_arr[0] if contexts_nr is not properly validated, enabling NULL pointer dereference vulnerability.CWE-476

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17 Jun 2026 10:33Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.15.5
EPSS0.00122
22