{"id":"CVE-2026-98485","published":"2026-10-18T16:16:59.187","lastModified":"2026-10-19T10:18:59.967","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_rt: fix zero-address non-strict match out-of-bounds read\n\nrt_mt6_check() permits rules to be configured with rtinfo->addrnr == 0\neven when address matching (IP6T_RT_FST_MASK) is requested.\n\nIn the IP6T_RT_FST_NSTRICT path, rt_mt6() evaluates packet routing\naddresses against rtinfo->addrs[i] and terminates backwards at the bottom\nof the loop:\n\n    if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {\n        i++;\n    }\n    if (i == rtinfo->addrnr)\n        break;\n\nWhen addrnr is 0, if the first packet address matches rtinfo->addrs[0],\ni is incremented to 1. Because i is now strictly greater than addrnr (0),\nthe loop termination condition (i == rtinfo->addrnr) is bypassed and will\nnever be satisfied.\n\nIf a crafted IPv6 packet contains matching routing addresses, i will\nadvance past IP6T_RT_HOPS (16). The subsequent call to ipv6_addr_equal()\nreads beyond struct ip6t_rt, triggering UBSAN/KASAN out-of-bounds warnings\nor kernel panics.\n\nFix this by:\n1. Rejecting rules in rt_mt6_check() where IP6T_RT_FST_MASK is set but\n   rtinfo->addrnr is zero.\n2. In rt_mt6(), moving the termination condition (i < rtinfo->addrnr)\n   into the for-loop header condition and removing the backwards break\n   at the end of the loop body.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/191239b0939692e92459d8d32cad14247fa93f89","tags":[]},{"url":"https://git.kernel.org/stable/c/5a54f8b7f7fe207a5c14713015a5820588faf1ad","tags":[]},{"url":"https://git.kernel.org/stable/c/82313c169eddc02b1bf5ba6b427803e272d3ec42","tags":[]},{"url":"https://git.kernel.org/stable/c/959d1829d1ce8b91b435b24a923b51bcc8897090","tags":[]},{"url":"https://git.kernel.org/stable/c/b89249819a7d6698bed152feafd3bc6c08489d15","tags":[]},{"url":"https://git.kernel.org/stable/c/d9cf4ac6f326330e1fe4d95671d36a6ff3593f64","tags":[]},{"url":"https://git.kernel.org/stable/c/dd55c0ea87bf70e4e4b3b683acd29ef981335b26","tags":[]},{"url":"https://git.kernel.org/stable/c/fe336bab13834394320997de8b16ca4a913b4f13","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}