CVE-2026-53134

Açıklama (NVD)

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.

Yayın: 25.06.2026 · Son değişiklik: 10.11.2026 · Zayıflık: CWE-401

CVSS 3.1 metrikleri

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Saldırı vektörü	Yerel
Karmaşıklık	Düşük
Gereken yetki	Düşük
Kullanıcı etkileşimi	Gerekmez
Kapsam	Değişmez
Gizlilik	Yok
Bütünlük	Yok
Erişilebilirlik	Yüksek

Hesaplanan temel puan: 5.5. CVSS hesaplayıcıda incele

Açıklama (NVD)

CVSS 3.1 metrikleri

Referanslar

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