Vulnerability-Lookup

FKIE_CVE-2026-45971

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Limit bpf program signature size Practical BPF signatures are significantly smaller than KMALLOC_MAX_CACHE_SIZE Allowing larger sizes opens the door for abuse by passing excessive size values and forcing the kernel into expensive allocation paths (via kmalloc_large or vmalloc).

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Limit bpf program signature size\n\nPractical BPF signatures are significantly smaller than\nKMALLOC_MAX_CACHE_SIZE\n\nAllowing larger sizes opens the door for abuse by passing excessive\nsize values and forcing the kernel into expensive allocation paths (via\nkmalloc_large or vmalloc)."
    }
  ],
  "id": "CVE-2026-45971",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:14.073",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2026-45971 (GCVE-0-2026-45971)

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

Title

bpf: Limit bpf program signature size

Summary

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/5835a077c6f5c565d…
https://git.kernel.org/stable/c/eb8166c7909799639…
https://git.kernel.org/stable/c/ea1535e28bb3773fc…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 349271568303695f0ac3563af153d2b4542f6986 , < 5835a077c6f5c565d525eaca9fac01572b97a9b9 (git) Affected: 349271568303695f0ac3563af153d2b4542f6986 , < eb8166c79097996396468a341de258a798789d36 (git) Affected: 349271568303695f0ac3563af153d2b4542f6986 , < ea1535e28bb3773fc0b3cbd1f3842b808016990c (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (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/syscall.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5835a077c6f5c565d525eaca9fac01572b97a9b9",
              "status": "affected",
              "version": "349271568303695f0ac3563af153d2b4542f6986",
              "versionType": "git"
            },
            {
              "lessThan": "eb8166c79097996396468a341de258a798789d36",
              "status": "affected",
              "version": "349271568303695f0ac3563af153d2b4542f6986",
              "versionType": "git"
            },
            {
              "lessThan": "ea1535e28bb3773fc0b3cbd1f3842b808016990c",
              "status": "affected",
              "version": "349271568303695f0ac3563af153d2b4542f6986",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/syscall.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "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": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Limit bpf program signature size\n\nPractical BPF signatures are significantly smaller than\nKMALLOC_MAX_CACHE_SIZE\n\nAllowing larger sizes opens the door for abuse by passing excessive\nsize values and forcing the kernel into expensive allocation paths (via\nkmalloc_large or vmalloc)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:18:30.651Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c"
        }
      ],
      "title": "bpf: Limit bpf program signature size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45971",
    "datePublished": "2026-05-27T12:18:30.651Z",
    "dateReserved": "2026-05-13T15:03:33.089Z",
    "dateUpdated": "2026-05-27T12:18:30.651Z",
    "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.

Action not permitted

FKIE_CVE-2026-45971

CVE-2026-45971 (GCVE-0-2026-45971)

Tags

Sightings

Nomenclature