{"id":"CVE-2026-53134","summary":"netfilter: nft_fib: fix stale stack leak via the OIFNAME register","details":"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.","modified":"2026-07-09T18:31:11.749626293Z","published":"2026-06-25T08:38:23.348Z","related":["CGA-6322-pw8x-7gfv"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53134.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3544210609f6d1db282bbdeca639104ef624c393"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6744e49fe51bfba26522acc2d0e9703cb41d8e50"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8c84885e9790823828bb8084736ea15769b1ac16"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d19ddef8c327a4773ff81f8e51027d1e0b4cf069"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb8a8124484dbc3c2b543e207da39bbccb703d31"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eca18feed38b3377a2ec5d1f22af1170c55d0171"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53134.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53134"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f6d0cbcf09c506b9b022df8f9d7693a7cec3c732"},{"fixed":"6744e49fe51bfba26522acc2d0e9703cb41d8e50"},{"fixed":"eca18feed38b3377a2ec5d1f22af1170c55d0171"},{"fixed":"d19ddef8c327a4773ff81f8e51027d1e0b4cf069"},{"fixed":"eb8a8124484dbc3c2b543e207da39bbccb703d31"},{"fixed":"8c84885e9790823828bb8084736ea15769b1ac16"},{"fixed":"84d8f58cf28a0415413f43ba7148f7bacd4c1b6e"},{"fixed":"3544210609f6d1db282bbdeca639104ef624c393"},{"fixed":"ab185e0c4fb82dfba6fb86f8271e06f931d9c64c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53134.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53134.json"}}],"schema_version":"1.7.5"}