CVE-2026-53134 (GCVE-0-2026-53134)
Vulnerability from cvelistv5
Published
2026-06-25 08:38
Modified
2026-06-25 08:38
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732
Version: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732
Version: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732
Version: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732
Version: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732
Version: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732
Version: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732
Version: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/netfilter/nft_fib_ipv4.c",
            "net/ipv6/netfilter/nft_fib_ipv6.c",
            "net/netfilter/nft_fib.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
            "net/ipv4/netfilter/nft_fib_ipv4.c",
            "net/ipv6/netfilter/nft_fib_ipv6.c",
            "net/netfilter/nft_fib.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
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            },
            {
              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "vulnerable": true
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                  "vulnerable": true
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                  "versionEndExcluding": "7.1",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_fib: fix stale stack leak via the OIFNAME register\n\nFor NFT_FIB_RESULT_OIFNAME the destination register is declared with\nlen = IFNAMSIZ (four 32-bit registers), but on the lookup-fail,\nRTN_LOCAL and oif-mismatch paths nft_fib{4,6}_eval() only writes one\nregister via \"*dest = 0\". The remaining three registers are left as\nwhatever was on the stack in nft_do_chain()\u0027s struct nft_regs, and a\ndownstream expression that loads the register span can leak that\nuninitialised kernel stack to userspace.\n\nThe NFTA_FIB_F_PRESENT existence check has the same shape: it is only\nmeaningful for NFT_FIB_RESULT_OIF, yet it was accepted for any result type\nwhile the eval stores a single byte via nft_reg_store8(), leaving the rest\nof the declared span stale.\n\nFix both:\n\n - replace the bare \"*dest = 0\" in the eval with nft_fib_store_result(),\n   which strscpy_pad()s the whole IFNAMSIZ for OIFNAME (and is already\n   used on the other early-return path), and\n\n - restrict NFTA_FIB_F_PRESENT to NFT_FIB_RESULT_OIF and declare its\n   destination as a single u8, so the marked span matches the one byte\n   the eval writes."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:38:23.348Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6744e49fe51bfba26522acc2d0e9703cb41d8e50"
        },
        {
          "url": "https://git.kernel.org/stable/c/eca18feed38b3377a2ec5d1f22af1170c55d0171"
        },
        {
          "url": "https://git.kernel.org/stable/c/d19ddef8c327a4773ff81f8e51027d1e0b4cf069"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb8a8124484dbc3c2b543e207da39bbccb703d31"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c84885e9790823828bb8084736ea15769b1ac16"
        },
        {
          "url": "https://git.kernel.org/stable/c/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3544210609f6d1db282bbdeca639104ef624c393"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c"
        }
      ],
      "title": "netfilter: nft_fib: fix stale stack leak via the OIFNAME register",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53134",
    "datePublished": "2026-06-25T08:38:23.348Z",
    "dateReserved": "2026-06-09T07:44:35.386Z",
    "dateUpdated": "2026-06-25T08:38:23.348Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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