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CVE-2026-53134

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 · fixed in 6744e49fe51bfba26522acc2d0e9703cb41d8e50; From f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 · fixed in eca18feed38b3377a2ec5d1f22af1170c55d0171; From f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 · fixed in d19ddef8c327a4773ff81f8e51027d1e0b4cf069; From f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 · fixed in eb8a8124484dbc3c2b543e207da39bbccb703d31; From f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 · fixed in 8c84885e9790823828bb8084736ea15769b1ac16; From f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 · fixed in 84d8f58cf28a0415413f43ba7148f7bacd4c1b6e; From f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 · fixed in 3544210609f6d1db282bbdeca639104ef624c393; From f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 · fixed in ab185e0c4fb82dfba6fb86f8271e06f931d9c64c

  • Linux Linux

    4.10

  • KernelLinux

    From 4.10.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.94; From 6.13.0 · fixed in 6.18.36; From 6.19.0 · fixed in 7.0.13

References 8

git.kernel.org