Answer in brief
CVE-2026-64563 records a High severity (CVSS 7.8) vulnerability in rhashtable: clear stale iter->p on table restart. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <3ff7c1dbf722cf3fa538672452ba182318e0fcc3 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 | 3ff7c1dbf722cf3fa538672452ba182318e0fcc3, 4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3, 8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 |
| Linux/Linuxgeneric | 4.18 | Not reported |
| Linux/Linuxgeneric | >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <c39643ad99fea749be50615550e8f0e6d6e60694 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <042fda5c088015f18838e5c692659a7be60aeb26 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <3ff7c1dbf722cf3fa538672452ba182318e0fcc3 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 | c39643ad99fea749be50615550e8f0e6d6e60694, 042fda5c088015f18838e5c692659a7be60aeb26, 3ff7c1dbf722cf3fa538672452ba182318e0fcc3, 4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3, 8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 |
| Linux/Linuxgeneric | >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <ba510b5e9fe396497d31162acb579f210adfe6c8 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <a0406c40c6638c5ae50257db6297b2fba6c9ba16 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <0955b65c2b47c30b439e2cf1b1e375073aa0413a || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <c39643ad99fea749be50615550e8f0e6d6e60694 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <042fda5c088015f18838e5c692659a7be60aeb26 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <3ff7c1dbf722cf3fa538672452ba182318e0fcc3 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3 || >=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 | ba510b5e9fe396497d31162acb579f210adfe6c8, a0406c40c6638c5ae50257db6297b2fba6c9ba16, 0955b65c2b47c30b439e2cf1b1e375073aa0413a, c39643ad99fea749be50615550e8f0e6d6e60694, 042fda5c088015f18838e5c692659a7be60aeb26, 3ff7c1dbf722cf3fa538672452ba182318e0fcc3, 4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3, 8173f7e2ce67e6ca1d4763f3da14e5b01ce77456 |
Published upstream
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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
Quoted source text, attributed separately from HOL analysis.