{"id":"CVE-2026-98596","published":"2026-10-18T16:17:12.283","lastModified":"2026-10-19T10:19:20.913","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix dst leak for uncached routes.\n\nip6_route_output_flags(), ip6_rt_put_flags(), and ip6_dst_check()\ndetect an uncached route by list_empty(&rt->dst.rt_uncached),\nwhich replaced the static DST_NOCACHE flag check in commit\na4c2fd7f7891 (\"net: remove DST_NOCACHE flag\").\n\nWhen a device is unregistered, rt6_uncached_list_flush_dev()\nunlinks uncached routes tied to the device from rt6_uncached_list.\n\nPreviously, they were moved to another list with list_move()\n(__list_del_entry() + list_add()), and since commit 98aa546af5e4\n(\"inet: remove (struct uncached_list)->quarantine\"), the routes\nare just unlinked with list_del_init().\n\nIf list_del_init() runs concurrently, list_empty() evaluates to\ntrue; ip6_route_output_flags() calls dst_hold_safe() incorrectly\nand ip6_rt_put_flags() skips ip6_rt_put(), leaking dst, and thus\ndev tied via rt->from as well.\n\nThe same race is partially fixed by commit 9a6f0c4d5796 (\"dst:\nfix races in rt6_uncached_list_del() and rt_del_uncached_list()\").\n\nLet's check rt6->dst.rt_uncached_list instead.\n\nNote that IPv4 does not have the same issue.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/5045aa25f3790dcdb158a58ac60ccf8da42959aa","tags":[]},{"url":"https://git.kernel.org/stable/c/be31fe6333f534155e6b408f1ef6d77974bb41aa","tags":[]},{"url":"https://git.kernel.org/stable/c/ed902d5546fb9c142b3216d8eec914fa1bc0aa80","tags":[]},{"url":"https://git.kernel.org/stable/c/f9722746df13a8a29103c847ef56b02c11ce0963","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}