CVE-2026-53134 (GCVE-0-2026-53134)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-25 08:38
VLAI
Title
netfilter: nft_fib: fix stale stack leak via the OIFNAME register
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 , < 6744e49fe51bfba26522acc2d0e9703cb41d8e50 (git)
Affected: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 , < eca18feed38b3377a2ec5d1f22af1170c55d0171 (git)
Affected: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 , < d19ddef8c327a4773ff81f8e51027d1e0b4cf069 (git)
Affected: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 , < eb8a8124484dbc3c2b543e207da39bbccb703d31 (git)
Affected: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 , < 8c84885e9790823828bb8084736ea15769b1ac16 (git)
Affected: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 , < 84d8f58cf28a0415413f43ba7148f7bacd4c1b6e (git)
Affected: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 , < 3544210609f6d1db282bbdeca639104ef624c393 (git)
Affected: f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 , < ab185e0c4fb82dfba6fb86f8271e06f931d9c64c (git)
Create a notification for this product.
Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "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"
      },
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          "url": "https://git.kernel.org/stable/c/6744e49fe51bfba26522acc2d0e9703cb41d8e50"
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          "url": "https://git.kernel.org/stable/c/eca18feed38b3377a2ec5d1f22af1170c55d0171"
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        {
          "url": "https://git.kernel.org/stable/c/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c"
        }
      ],
      "title": "netfilter: nft_fib: fix stale stack leak via the OIFNAME register",
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    "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"
  },
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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 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.