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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于rhashtable_walk_start_check()在表重启时未清除陈旧的iter->p，导致rhashtable_walk_next()解引用已释放内存，可能存在释放后重用，进而导致内核崩溃或信息泄露。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8< ba510b5e9fe396497d31162acb579f210adfe6c8 affected
5d240a8936f6a1d3ece06701e8c4d830a2eca8a8< a0406c40c6638c5ae50257db6297b2fba6c9ba16 affected
5d240a8936f6a1d3ece06701e8c4d830a2eca8a8< 0955b65c2b47c30b439e2cf1b1e375073aa0413a affected
5d240a8936f6a1d3ece06701e8c4d830a2eca8a8< c39643ad99fea749be50615550e8f0e6d6e60694 affected
5d240a8936f6a1d3ece06701e8c4d830a2eca8a8< 042fda5c088015f18838e5c692659a7be60aeb26 affected
5d240a8936f6a1d3ece06701e8c4d830a2eca8a8< 3ff7c1dbf722cf3fa538672452ba182318e0fcc3 affected
5d240a8936f6a1d3ece06701e8c4d830a2eca8a8< 4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3 affected
5d240a8936f6a1d3ece06701e8c4d830a2eca8a8< 8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 affected
… +10 more rows
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I. Basic Information for CVE-2026-64563

Vulnerability Information
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Vulnerability Title
rhashtable: clear stale iter->p on table restart
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于rhashtable_walk_start_check()在表重启时未清除陈旧的iter->p，导致rhashtable_walk_next()解引用已释放内存，可能存在释放后重用，进而导致内核崩溃或信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 ~ ba510b5e9fe396497d31162acb579f210adfe6c8 -
Linux Linux 4.18 -

II. Public POCs for CVE-2026-64563

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III. Intelligence Information for CVE-2026-64563

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Patches & Fixes for CVE-2026-64563 (8)

Same Patch Batch · Linux · 2026-08-04 · 5 CVEs total

CVE-2026-64564 9.8 CRITICAL sctp: don't free the ASCONF's own transport in DEL-IP processing
CVE-2026-64562 8.8 HIGH KVM: nVMX: Hide shadow VMCS right after VMCLEAR
CVE-2026-64561 8.8 HIGH KVM: x86: Check for invalid/obsolete root *after* making MMU pages available
CVE-2026-64565 Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64563

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