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netfilter: nft_exthdr: fix register tracking for F_PRESENT flag

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs. Bail out if userspace requests too much data when F_PRESENT is set.

Announced Source revision 1
Original source ↗

CVE-2026-53218

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-2026-53218

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": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
        "lessThan": "8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
        "lessThan": "19748967d59c31d24d21d40b728570788310b237",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
        "lessThan": "46fc15a044e9938e7ea77786fb37edd2cd74f031",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
        "lessThan": "cd513e43b4b2bd1de39e2367bc4261c699a8652f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
        "lessThan": "67b27434c43b68a97becda98c9f0c8cf6cba2134",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
        "lessThan": "78069a6d8bc86c9e036eb82c2af4a19cc1871a53",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
        "lessThan": "f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783",
        "lessThan": "772cecf198da732faebb5dcfc46d66a505be8495",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_exthdr.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_exthdr.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53218

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28438 · Revision 1
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Publisher date
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