FKIE_CVE-2026-52999

Vulnerability from fkie_nvd - Published: 2026-06-24 17:17 - Updated: 2026-06-28 08:16
Severity
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix out-of-bounds read on option matching In nf_osf_match(), the nf_osf_hdr_ctx structure is initialized once and passed by reference to nf_osf_match_one() for each fingerprint checked. During TCP option parsing, nf_osf_match_one() advances the shared ctx->optp pointer. If a fingerprint perfectly matches, the function returns early without restoring ctx->optp to its initial state. If the user has configured NF_OSF_LOGLEVEL_ALL, the loop continues to the next fingerprint. However, because ctx->optp was not restored, the next call to nf_osf_match_one() starts parsing from the end of the options buffer. This causes subsequent matches to read garbage data and fail immediately, making it impossible to log more than one match or logging incorrect matches. Instead of using a shared ctx->optp pointer, pass the context as a constant pointer and use a local pointer (optp) for TCP option traversal. This makes nf_osf_match_one() strictly stateless from the caller's perspective, ensuring every fingerprint check starts at the correct option offset.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0145548346c4a30981a870a8ca00eac46ba27e85
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c136f2c44a5913646bac85303612fd0825197a0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e19a07291bb8682c14c39a64725a3ae54ab8ccc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/21883587593d7c8bb519a79460a0b5bc5ffbdabd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32e50f92c7cf3f4eba29622179a5fcdc2aebab41
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70a3f31d25cf2ec9d4ddfa408120171ead955623
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/edb78a142d2e5948e63647c0646aa7e7886935f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f5ca450087c3baf3651055e7a6de92600f827af3
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nfnetlink_osf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0145548346c4a30981a870a8ca00eac46ba27e85",
              "status": "affected",
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "versionType": "git"
            },
            {
              "lessThan": "1c136f2c44a5913646bac85303612fd0825197a0",
              "status": "affected",
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "versionType": "git"
            },
            {
              "lessThan": "1e19a07291bb8682c14c39a64725a3ae54ab8ccc",
              "status": "affected",
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "versionType": "git"
            },
            {
              "lessThan": "32e50f92c7cf3f4eba29622179a5fcdc2aebab41",
              "status": "affected",
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "versionType": "git"
            },
            {
              "lessThan": "70a3f31d25cf2ec9d4ddfa408120171ead955623",
              "status": "affected",
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "versionType": "git"
            },
            {
              "lessThan": "21883587593d7c8bb519a79460a0b5bc5ffbdabd",
              "status": "affected",
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "versionType": "git"
            },
            {
              "lessThan": "edb78a142d2e5948e63647c0646aa7e7886935f0",
              "status": "affected",
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "versionType": "git"
            },
            {
              "lessThan": "f5ca450087c3baf3651055e7a6de92600f827af3",
              "status": "affected",
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0c1054e0e5fdef2369fb089e94def978bd209e1f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8316b60582facd4068fb0916c4db2418c21b7174",
              "versionType": "git"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.26",
              "versionType": "semver"
            },
            {
              "lessThan": "4.21",
              "status": "affected",
              "version": "4.20.13",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nfnetlink_osf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "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\nnetfilter: nfnetlink_osf: fix out-of-bounds read on option matching\n\nIn nf_osf_match(), the nf_osf_hdr_ctx structure is initialized once\nand passed by reference to nf_osf_match_one() for each fingerprint\nchecked. During TCP option parsing, nf_osf_match_one() advances the\nshared ctx-\u003eoptp pointer.\n\nIf a fingerprint perfectly matches, the function returns early without\nrestoring ctx-\u003eoptp to its initial state. If the user has configured\nNF_OSF_LOGLEVEL_ALL, the loop continues to the next fingerprint.\nHowever, because ctx-\u003eoptp was not restored, the next call to\nnf_osf_match_one() starts parsing from the end of the options buffer.\nThis causes subsequent matches to read garbage data and fail\nimmediately, making it impossible to log more than one match or logging\nincorrect matches.\n\nInstead of using a shared ctx-\u003eoptp pointer, pass the context as a\nconstant pointer and use a local pointer (optp) for TCP option\ntraversal. This makes nf_osf_match_one() strictly stateless from the\ncaller\u0027s perspective, ensuring every fingerprint check starts at the\ncorrect option offset."
    }
  ],
  "id": "CVE-2026-52999",
  "lastModified": "2026-06-28T08:16:28.703",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-06-24T17:17:10.913",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0145548346c4a30981a870a8ca00eac46ba27e85"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1c136f2c44a5913646bac85303612fd0825197a0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1e19a07291bb8682c14c39a64725a3ae54ab8ccc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/21883587593d7c8bb519a79460a0b5bc5ffbdabd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/32e50f92c7cf3f4eba29622179a5fcdc2aebab41"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70a3f31d25cf2ec9d4ddfa408120171ead955623"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/edb78a142d2e5948e63647c0646aa7e7886935f0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f5ca450087c3baf3651055e7a6de92600f827af3"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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