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gue: validate REMCSUM private option length

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: gue: validate REMCSUM private option length GUE private flags can indicate that remote checksum offload metadata is present. The private flags field itself is accounted for by guehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even when GUE_PFLAG_REMCSUM is set. This lets a packet with only the private flags field pass validate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum() read the missing REMCSUM start/offset fields from the following bytes. Account for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that malformed packets are rejected during option validation.

Announced Group revision 1
Original source ↗

CVE-2026-72351

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-2026-72351

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": "c1aa8347e73e4092411fbd96cc59531fb7e76d04",
        "lessThan": "158b9995d3c87f3b93f5c22df54a12e12a3438b3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04",
        "lessThan": "7c6876ec1b227261b51803f784c7be1b2242a1a0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04",
        "lessThan": "2c4de9988e9ddc760b750d6b6e701c35ff60ad14",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04",
        "lessThan": "2a99224c120823987e4d829726f4ecb33e03fc1e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04",
        "lessThan": "61e78679c7c9ca685bff58e4b6348304dc60aafd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04",
        "lessThan": "4a4a1d41c6e901e773bcf795f562a47fa71f692a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04",
        "lessThan": "f618cbe9b24cd0202004d2db781d5f80ab77037f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04",
        "lessThan": "d335dcc6f521571d57117b8deeebc940836e5450",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/net/gue.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/gue.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72351

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#33035 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-72351 · Revision 1Source updated