CVE-2026-64563 (GCVE-0-2026-64563)
Vulnerability from cvelistv5
Published
2026-08-04 06:23
Modified
2026-10-19 20:48
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8
Version: 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8
Version: 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8
Version: 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8
Version: 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8
Version: 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8
Version: 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8
Version: 5d240a8936f6a1d3ece06701e8c4d830a2eca8a8
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    "datePublished": "2026-08-04T06:23:22.601Z",
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    "dateUpdated": "2026-10-19T20:48:41.938Z",
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\"https://git.kernel.org/stable/c/c39643ad99fea749be50615550e8f0e6d6e60694\"}, {\"url\": \"https://git.kernel.org/stable/c/042fda5c088015f18838e5c692659a7be60aeb26\"}, {\"url\": \"https://git.kernel.org/stable/c/3ff7c1dbf722cf3fa538672452ba182318e0fcc3\"}, {\"url\": \"https://git.kernel.org/stable/c/4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3\"}, {\"url\": \"https://git.kernel.org/stable/c/8173f7e2ce67e6ca1d4763f3da14e5b01ce77456\"}], \"title\": \"rhashtable: clear stale iter-\u003ep on table restart\", \"x_generator\": {\"engine\": \"bippy-1.2.0\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-64563\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:42:55.008845Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:42:55.661Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64563\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-07-19T15:36:31.797Z\", \"datePublished\": \"2026-08-04T06:23:22.601Z\", \"dateUpdated\": \"2026-10-19T20:48:41.938Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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