CVE-2026-53134
Estado: ModificadaMedia (5.5)—
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.
Leer descripción completaMostrar menos
Fix both:
Detalles técnicos trazas, registros y código del informe original
- 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.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.13%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 4/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-401
Referencias
- https://git.kernel.org/stable/c/3544210609f6d1db282bbdeca639104ef624c393
- https://git.kernel.org/stable/c/6744e49fe51bfba26522acc2d0e9703cb41d8e50
- https://git.kernel.org/stable/c/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e
- https://git.kernel.org/stable/c/8c84885e9790823828bb8084736ea15769b1ac16
- https://git.kernel.org/stable/c/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c
- https://git.kernel.org/stable/c/d19ddef8c327a4773ff81f8e51027d1e0b4cf069
- https://git.kernel.org/stable/c/eb8a8124484dbc3c2b543e207da39bbccb703d31
- https://git.kernel.org/stable/c/eca18feed38b3377a2ec5d1f22af1170c55d0171
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
JSON original (NVD)
Mostrar
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"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()'s 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."
}
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