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netfilter: nft_fib: fix stale stack leak via the OIFNAME register

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_fib: fix stale stack leak via the OIFNAME register For NFT_FIB_RESULT_OIFNAME the destination register is declared with len = IFNAMSIZ (four 32-bit registers), but on the lookup-fail, RTN_LOCAL and oif-mismatch paths nft_fib{4,6}_eval() only writes one register via "*dest = 0". The remaining three registers are left as whatever was on the stack in nft_do_chain()'s struct nft_regs, and a downstream expression that loads the register span can leak that uninitialised kernel stack to userspace. The NFTA_FIB_F_PRESENT existence check has the same shape: it is only meaningful for NFT_FIB_RESULT_OIF, yet it was accepted for any result type while the eval stores a single byte via nft_reg_store8(), leaving the rest of the declared span stale. Fix both: - replace the bare "*dest = 0" in the eval with nft_fib_store_result(), which strscpy_pad()s the whole IFNAMSIZ for OIFNAME (and is already used on the other early-return path), and - restrict NFTA_FIB_F_PRESENT to NFT_FIB_RESULT_OIF and declare its destination as a single u8, so the marked span matches the one byte the eval writes.

Announced Source revision 1
Original source ↗

CVE-2026-53134

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-2026-53134

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": "f6d0cbcf09c506b9b022df8f9d7693a7cec3c732",
        "lessThan": "6744e49fe51bfba26522acc2d0e9703cb41d8e50",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f6d0cbcf09c506b9b022df8f9d7693a7cec3c732",
        "lessThan": "eca18feed38b3377a2ec5d1f22af1170c55d0171",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f6d0cbcf09c506b9b022df8f9d7693a7cec3c732",
        "lessThan": "d19ddef8c327a4773ff81f8e51027d1e0b4cf069",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f6d0cbcf09c506b9b022df8f9d7693a7cec3c732",
        "lessThan": "eb8a8124484dbc3c2b543e207da39bbccb703d31",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f6d0cbcf09c506b9b022df8f9d7693a7cec3c732",
        "lessThan": "8c84885e9790823828bb8084736ea15769b1ac16",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f6d0cbcf09c506b9b022df8f9d7693a7cec3c732",
        "lessThan": "84d8f58cf28a0415413f43ba7148f7bacd4c1b6e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f6d0cbcf09c506b9b022df8f9d7693a7cec3c732",
        "lessThan": "3544210609f6d1db282bbdeca639104ef624c393",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f6d0cbcf09c506b9b022df8f9d7693a7cec3c732",
        "lessThan": "ab185e0c4fb82dfba6fb86f8271e06f931d9c64c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/netfilter/nft_fib_ipv4.c",
      "net/ipv6/netfilter/nft_fib_ipv6.c",
      "net/netfilter/nft_fib.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.10",
        "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/ipv4/netfilter/nft_fib_ipv4.c",
      "net/ipv6/netfilter/nft_fib_ipv6.c",
      "net/netfilter/nft_fib.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53134

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28428 · Revision 1
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Publisher date
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