CVE-2026-64563rhashtable: clear stale iter->p on table restart
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 – < ba510b5e9fe396497d31162acb579f210adfe6c8
- affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 – < a0406c40c6638c5ae50257db6297b2fba6c9ba16
- affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 – < 0955b65c2b47c30b439e2cf1b1e375073aa0413a
- affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 – < c39643ad99fea749be50615550e8f0e6d6e60694
- affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 – < 042fda5c088015f18838e5c692659a7be60aeb26
- affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 – < 3ff7c1dbf722cf3fa538672452ba182318e0fcc3
- affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 – < 4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3
- affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 – < 8173f7e2ce67e6ca1d4763f3da14e5b01ce77456
- affected 4.18
- unaffected < 4.18
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.151 – ≤ 6.6.*
- unaffected 6.12.103 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/ba510b5e9fe396497d31162acb579f210adfe6c8 (opens in a new tab)
- https://git.kernel.org/stable/c/a0406c40c6638c5ae50257db6297b2fba6c9ba16 (opens in a new tab)
- https://git.kernel.org/stable/c/0955b65c2b47c30b439e2cf1b1e375073aa0413a (opens in a new tab)
- https://git.kernel.org/stable/c/c39643ad99fea749be50615550e8f0e6d6e60694 (opens in a new tab)
- https://git.kernel.org/stable/c/042fda5c088015f18838e5c692659a7be60aeb26 (opens in a new tab)
- https://git.kernel.org/stable/c/3ff7c1dbf722cf3fa538672452ba182318e0fcc3 (opens in a new tab)
- https://git.kernel.org/stable/c/4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3 (opens in a new tab)
- https://git.kernel.org/stable/c/8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-52604 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-64563)Record last updated .