rhashtable: clear stale iter->p on table restart

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64563
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-04 07:16:31 UTC
Updated2026-08-19 17:20:16 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001170000 probability, percentile 0.019330000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 ba510b5e9fe396497d31162acb579f210adfe6c8 git Not specified
CNA Linux Linux affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 a0406c40c6638c5ae50257db6297b2fba6c9ba16 git Not specified
CNA Linux Linux affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 0955b65c2b47c30b439e2cf1b1e375073aa0413a git Not specified
CNA Linux Linux affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 c39643ad99fea749be50615550e8f0e6d6e60694 git Not specified
CNA Linux Linux affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 042fda5c088015f18838e5c692659a7be60aeb26 git Not specified
CNA Linux Linux affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 3ff7c1dbf722cf3fa538672452ba182318e0fcc3 git Not specified
CNA Linux Linux affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3 git Not specified
CNA Linux Linux affected 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 git Not specified
CNA Linux Linux affected 4.18 Not specified
CNA Linux Linux unaffected 4.18 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ba510b5e9fe396497d31162acb579f210adfe6c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0955b65c2b47c30b439e2cf1b1e375073aa0413a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3ff7c1dbf722cf3fa538672452ba182318e0fcc3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/042fda5c088015f18838e5c692659a7be60aeb26 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c39643ad99fea749be50615550e8f0e6d6e60694 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0406c40c6638c5ae50257db6297b2fba6c9ba16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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