CVE-2026-64563

CVE CVE-2026-64563EUVD EUVD-2026-52604Published 2026-08-04T06:23:22.000ZLast changed 2026-08-09T18:34:59.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: rhashtable: clear stale iter->p on table restart rhashtable_walk_start_check() has two restart paths when resuming a walk. When iter->walker.tbl is valid, it re-validates iter->p against the table and sets iter->p = NULL if the object is gone. When iter->walker.tbl is NULL (table was freed during resize), it resets slot and skip but forgets to clear iter->p. rhashtable_walk_next() then dereferences the stale iter->p, reading freed memory. This is a use-after-free. Any caller that does multi-fragment rhashtable walks across walk_stop/walk_start boundaries is affected. Concrete cases include netlink_diag (__netlink_diag_dump in net/netlink/diag.c) and TIPC (tipc_nl_sk_walk in net/tipc/socket.c). Crash stack (netlink_diag): BUG: KASAN: slab-use-after-free in rhashtable_walk_next+0x365/0x3c0 Read of size 8 at addr ffff88801a9d2438 (freed kmalloc-2k, offset 1080) Call Trace: rhashtable_walk_next+0x365/0x3c0 (lib/rhashtable.c:1016) __netlink_diag_dump+0x160/0x760 (net/netlink/diag.c:122) netlink_diag_dump+0xc2/0x240 netlink_dump+0x5bc/0x1270 netlink_recvmsg+0x7a3/0x980 sock_recvmsg+0x1bc/0x200 __sys_recvfrom+0x1d4/0x2c0

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <042fda5c088015f18838e5c692659a7be60aeb26; patch: 6.6.151; 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3; 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <3ff7c1dbf722cf3fa538672452ba182318e0fcc3; 4.18; patch: 7.2-rc5; 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <c39643ad99fea749be50615550e8f0e6d6e60694; patch: 6.18.42; patch: 6.12.103; 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <8173f7e2ce67e6ca1d4763f3da14e5b01ce77456; patch: 7.1.6; patch: 0

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

Does this concern one of your customers?

This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.

Try it for 28 days

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.