Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 before 6744e49fe51bfba26522acc2d0e9703cb41d8e50; affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 before eca18feed38b3377a2ec5d1f22af1170c55d0171; affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 before d19ddef8c327a4773ff81f8e51027d1e0b4cf069; affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 before eb8a8124484dbc3c2b543e207da39bbccb703d31; affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 before 8c84885e9790823828bb8084736ea15769b1ac16; affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 before 84d8f58cf28a0415413f43ba7148f7bacd4c1b6e; affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 before 3544210609f6d1db282bbdeca639104ef624c393; affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 before ab185e0c4fb82dfba6fb86f8271e06f931d9c64c |
| Linux / Linux | affected 4.10; unaffected 0 before 4.10; unaffected 5.10.259 through 5.10.*; unaffected 5.15.210 through 5.15.*; unaffected 6.1.176 through 6.1.*; unaffected 6.6.143 through 6.6.*; unaffected 6.12.94 through 6.12.*; unaffected 6.18.36 through 6.18.*; unaffected 7.0.13 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6744e49fe51bfba26522acc2d0e9703cb41d8e50
- https://git.kernel.org/stable/c/eca18feed38b3377a2ec5d1f22af1170c55d0171
- https://git.kernel.org/stable/c/d19ddef8c327a4773ff81f8e51027d1e0b4cf069
- https://git.kernel.org/stable/c/eb8a8124484dbc3c2b543e207da39bbccb703d31
- https://git.kernel.org/stable/c/8c84885e9790823828bb8084736ea15769b1ac16
- https://git.kernel.org/stable/c/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e
- https://git.kernel.org/stable/c/3544210609f6d1db282bbdeca639104ef624c393
- https://git.kernel.org/stable/c/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c
ADP enrichment
No English description supplied.