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netfilter: nft_payload: fix mask build for partial field offload

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_payload: fix mask build for partial field offload nft_payload_offload_mask() builds the offload match mask for a payload expression that covers only part of a header field. For a partial IPv6 address match (field_len = 16, priv_len = 1) that shift is 1 << 120, which is undefined on the 32-bit int operand. It also trims only one word, so the remaining words stay 0xffffffff (and when priv_len is a multiple of 4 the trim is skipped entirely), leaving the mask covering more bytes than the rule matches. UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20 shift exponent 120 is too large for 32-bit type 'int' ... The match is byte-granular and struct nft_data is zero-initialised, so the correct mask is simply the first priv_len bytes set to 0xff. Set those bytes directly and drop the word/shift trimming; this removes the undefined shift and no longer over-masks the trailing bytes.

Announced Source revision 1
Original source ↗

CVE-2026-74579

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-2026-74579

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": "a5d45bc0dc50f9dd83703510e9804d813a9cac32",
        "lessThan": "3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32",
        "lessThan": "8720df4504e0ed1781a702f65251bd47b3534d5e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32",
        "lessThan": "363c3a84a946d53e5e121c9f47c7c2b7d228c46b",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "b19b5d2e042c294e2cc1c908dc598f9d64015396",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32",
        "lessThan": "a375d8ace807767f29f276b681b6324c74929b1d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32",
        "lessThan": "16b553c46e347bc9de9946c4960654d5884a86de",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32",
        "lessThan": "630295d5bba1d0e0f494cc459452eb0a0058c545",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a5d45bc0dc50f9dd83703510e9804d813a9cac32",
        "lessThan": "39e88f28fb32bf02bd4b525c24c842c9cff5663d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5c2b4b4f9fa5b765b927e361e3d310bcb5773015",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.9.14",
        "lessThan": "5.10",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_payload.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_payload.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74579

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33217 · Revision 1
Added to Heist Feed
Publisher date
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