High 7.8Published Aug 4, 2026

CVE-2026-64563rhashtable: clear stale iter->p on table restart

Updated under an hour ago (Oct 26, 2026, 4:40 PM ET)

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Exploited in the last 30 days

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

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 before ba510b5e9fe396497d31162acb579f210adfe6c8; from 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 before a0406c40c6638c5ae50257db6297b2fba6c9ba16; from 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 before 0955b65c2b47c30b439e2cf1b1e375073aa0413a; from 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 before c39643ad99fea749be50615550e8f0e6d6e60694; from 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 before 042fda5c088015f18838e5c692659a7be60aeb26; 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 builds before 3ff7c1dbf722cf3fa538672452ba182318e0fcc3; from 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 before 4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3; from 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 before 8173f7e2ce67e6ca1d4763f3da14e5b01ce77456	CNA record

References

References

https://git.kernel.org/stable/c/ba510b5e9fe396497d31162acb579f210adfe6c8
https://git.kernel.org/stable/c/a0406c40c6638c5ae50257db6297b2fba6c9ba16
https://git.kernel.org/stable/c/0955b65c2b47c30b439e2cf1b1e375073aa0413a
https://git.kernel.org/stable/c/c39643ad99fea749be50615550e8f0e6d6e60694
https://git.kernel.org/stable/c/042fda5c088015f18838e5c692659a7be60aeb26
https://git.kernel.org/stable/c/3ff7c1dbf722cf3fa538672452ba182318e0fcc3
https://git.kernel.org/stable/c/4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3
https://git.kernel.org/stable/c/8173f7e2ce67e6ca1d4763f3da14e5b01ce77456

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.