Vulnerability-Lookup

FKIE_CVE-2026-45951

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-30 11:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free of BTF object Refcounting in the check_pseudo_btf_id() function is incorrect: the __check_pseudo_btf_id() function might get called with a zero refcounted btf. Fix this, and patch related code accordingly. v3: rephrase a comment (AI) v2: fix a refcount leak introduced in v1 (AI)

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9ff46ffeecdb1802d6e26183177935b948a12e7f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ccd2d799ed4467c07f5ee18c2f5c59bcc990822c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eac65c272f3b49021a843cba5107d63627395e0e

Impacted products

	Vendor	Product	Version

JSON

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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a potential use-after-free of BTF object\n\nRefcounting in the check_pseudo_btf_id() function is incorrect:\nthe __check_pseudo_btf_id() function might get called with a zero\nrefcounted btf. Fix this, and patch related code accordingly.\n\nv3: rephrase a comment (AI)\nv2: fix a refcount leak introduced in v1 (AI)"
    }
  ],
  "id": "CVE-2026-45951",
  "lastModified": "2026-05-30T11:17:16.730",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-27T14:17:11.613",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9ff46ffeecdb1802d6e26183177935b948a12e7f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ccd2d799ed4467c07f5ee18c2f5c59bcc990822c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eac65c272f3b49021a843cba5107d63627395e0e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2026-45951 (GCVE-0-2026-45951)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-05-30 10:46

Title

bpf: Fix a potential use-after-free of BTF object

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/eac65c272f3b49021…
https://git.kernel.org/stable/c/9ff46ffeecdb1802d…
https://git.kernel.org/stable/c/ccd2d799ed4467c07…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 76145f7255326761dafb76721a785799d8a00d5f , < eac65c272f3b49021a843cba5107d63627395e0e (git) Affected: 76145f7255326761dafb76721a785799d8a00d5f , < 9ff46ffeecdb1802d6e26183177935b948a12e7f (git) Affected: 76145f7255326761dafb76721a785799d8a00d5f , < ccd2d799ed4467c07f5ee18c2f5c59bcc990822c (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "eac65c272f3b49021a843cba5107d63627395e0e",
              "status": "affected",
              "version": "76145f7255326761dafb76721a785799d8a00d5f",
              "versionType": "git"
            },
            {
              "lessThan": "9ff46ffeecdb1802d6e26183177935b948a12e7f",
              "status": "affected",
              "version": "76145f7255326761dafb76721a785799d8a00d5f",
              "versionType": "git"
            },
            {
              "lessThan": "ccd2d799ed4467c07f5ee18c2f5c59bcc990822c",
              "status": "affected",
              "version": "76145f7255326761dafb76721a785799d8a00d5f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a potential use-after-free of BTF object\n\nRefcounting in the check_pseudo_btf_id() function is incorrect:\nthe __check_pseudo_btf_id() function might get called with a zero\nrefcounted btf. Fix this, and patch related code accordingly.\n\nv3: rephrase a comment (AI)\nv2: fix a refcount leak introduced in v1 (AI)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-30T10:46:12.863Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eac65c272f3b49021a843cba5107d63627395e0e"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ff46ffeecdb1802d6e26183177935b948a12e7f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccd2d799ed4467c07f5ee18c2f5c59bcc990822c"
        }
      ],
      "title": "bpf: Fix a potential use-after-free of BTF object",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45951",
    "datePublished": "2026-05-27T12:18:07.255Z",
    "dateReserved": "2026-05-13T15:03:33.088Z",
    "dateUpdated": "2026-05-30T10:46:12.863Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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FKIE_CVE-2026-45951

CVE-2026-45951 (GCVE-0-2026-45951)

Tags

Sightings

Nomenclature