{"id":"CVE-2026-64563","published":"2026-08-04T07:16:31.220","lastModified":"2026-08-09T19:17:02.237","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrhashtable: clear stale iter->p on table restart\n\nrhashtable_walk_start_check() has two restart paths when resuming a walk.\nWhen iter->walker.tbl is valid, it re-validates iter->p against the table\nand sets iter->p = NULL if the object is gone.  When iter->walker.tbl is\nNULL (table was freed during resize), it resets slot and skip but forgets\nto clear iter->p.\n\nrhashtable_walk_next() then dereferences the stale iter->p, reading\nfreed memory.  This is a use-after-free.\n\nAny caller that does multi-fragment rhashtable walks across\nwalk_stop/walk_start boundaries is affected.  Concrete cases include\nnetlink_diag (__netlink_diag_dump in net/netlink/diag.c) and TIPC\n(tipc_nl_sk_walk in net/tipc/socket.c).\n\nCrash stack (netlink_diag):\n  BUG: KASAN: slab-use-after-free in rhashtable_walk_next+0x365/0x3c0\n  Read of size 8 at addr ffff88801a9d2438 (freed kmalloc-2k, offset 1080)\n  Call Trace:\n   rhashtable_walk_next+0x365/0x3c0 (lib/rhashtable.c:1016)\n   __netlink_diag_dump+0x160/0x760 (net/netlink/diag.c:122)\n   netlink_diag_dump+0xc2/0x240\n   netlink_dump+0x5bc/0x1270\n   netlink_recvmsg+0x7a3/0x980\n   sock_recvmsg+0x1bc/0x200\n   __sys_recvfrom+0x1d4/0x2c0","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/042fda5c088015f18838e5c692659a7be60aeb26","tags":[]},{"url":"https://git.kernel.org/stable/c/3ff7c1dbf722cf3fa538672452ba182318e0fcc3","tags":[]},{"url":"https://git.kernel.org/stable/c/4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3","tags":[]},{"url":"https://git.kernel.org/stable/c/8173f7e2ce67e6ca1d4763f3da14e5b01ce77456","tags":[]},{"url":"https://git.kernel.org/stable/c/c39643ad99fea749be50615550e8f0e6d6e60694","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"This vulnerability in the Linux kernel's rhashtable implementation allows a use-after-free condition, leading to potential crashes or exploitation by an attacker with local access.","exploitability":"Exploitation requires local access and the ability to trigger a multi-fragment rhashtable walk across walk_stop/walk_start boundaries. The vulnerability is present in specific kernel functions like netlink_diag and TIPC.","blast_radius":"If exploited, the impact could range from system crashes to potential privilege escalation, depending on the context in which the affected functions are used.","remediation":"Upgrade to the specific patched kernel version, such as 'Upgrade to v5.19.10 or later'.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["local-priv-escalation","kernel","use-after-free"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-09T08:45:12.438Z"}}