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FKIE_CVE-2026-92520

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Zero queue and stack outputs on lock failure Queue and stack pop/peek helpers accept an uninitialized output buffer because the verifier expects the helper to initialize it. The empty-map error path clears the buffer, but a failed lock acquisition returns -EBUSY without writing it. Clear the output before returning -EBUSY so BPF programs cannot observe uninitialized stack contents after a failed helper call.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1534c4bff3aaca19c4c9a82f93e9b81f7c983de3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2396b8a562073787e627a5f483f1bc5c452fa6a
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/queue_stack_maps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1534c4bff3aaca19c4c9a82f93e9b81f7c983de3",
              "status": "affected",
              "version": "a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8",
              "versionType": "git"
            },
            {
              "lessThan": "e2396b8a562073787e627a5f483f1bc5c452fa6a",
              "status": "affected",
              "version": "a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8",
              "versionType": "git"
            },
            {
              "lessThan": "7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232",
              "status": "affected",
              "version": "a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "40e34ea01748e5b8afdd40a172868be1e1ab0ede",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "388c9d3eefaea99828ee5000c693128a5b41ee7c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "acabf5df49aa3a4f9c96200102d893351b511a88",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e388671635acf470f0986d874389148fd234620b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "232f0ba4d69263af5912e279fcc32fef2882b1dc",
              "versionType": "git"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.258",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.198",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.134",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.56",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6",
              "status": "affected",
              "version": "6.5.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/queue_stack_maps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Zero queue and stack outputs on lock failure\n\nQueue and stack pop/peek helpers accept an uninitialized output buffer\nbecause the verifier expects the helper to initialize it. The empty-map\nerror path clears the buffer, but a failed lock acquisition returns\n-EBUSY without writing it.\n\nClear the output before returning -EBUSY so BPF programs cannot observe\nuninitialized stack contents after a failed helper call."
    }
  ],
  "id": "CVE-2026-92520",
  "lastModified": "2026-09-17T17:17:54.900",
  "metrics": {},
  "published": "2026-09-17T17:17:54.900",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1534c4bff3aaca19c4c9a82f93e9b81f7c983de3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e2396b8a562073787e627a5f483f1bc5c452fa6a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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