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netfilter: nfnetlink_osf: fix out-of-bounds read on option matching

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-52999

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-52999

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
        "lessThan": "0145548346c4a30981a870a8ca00eac46ba27e85",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
        "lessThan": "1c136f2c44a5913646bac85303612fd0825197a0",
        "versionType": "git"
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        "lessThan": "1e19a07291bb8682c14c39a64725a3ae54ab8ccc",
        "versionType": "git"
      },
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        "status": "affected",
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        "status": "affected",
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        "lessThan": "21883587593d7c8bb519a79460a0b5bc5ffbdabd",
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      },
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        "status": "affected",
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        "lessThan": "f5ca450087c3baf3651055e7a6de92600f827af3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0c1054e0e5fdef2369fb089e94def978bd209e1f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8316b60582facd4068fb0916c4db2418c21b7174",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.19.26",
        "lessThan": "4.20",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.20.13",
        "lessThan": "4.21",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/netfilter/nfnetlink_osf.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.141",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.91",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.33",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nfnetlink_osf.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-52999

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40729 · Revision 1
Added to Heist Feed
Publisher date
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