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rhashtable: clear stale iter->p on table restart

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-64563

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64563

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5d240a8936f6a1d3ece06701e8c4d830a2eca8a8",
        "lessThan": "ba510b5e9fe396497d31162acb579f210adfe6c8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d240a8936f6a1d3ece06701e8c4d830a2eca8a8",
        "lessThan": "a0406c40c6638c5ae50257db6297b2fba6c9ba16",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d240a8936f6a1d3ece06701e8c4d830a2eca8a8",
        "lessThan": "0955b65c2b47c30b439e2cf1b1e375073aa0413a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d240a8936f6a1d3ece06701e8c4d830a2eca8a8",
        "lessThan": "c39643ad99fea749be50615550e8f0e6d6e60694",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d240a8936f6a1d3ece06701e8c4d830a2eca8a8",
        "lessThan": "042fda5c088015f18838e5c692659a7be60aeb26",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d240a8936f6a1d3ece06701e8c4d830a2eca8a8",
        "lessThan": "3ff7c1dbf722cf3fa538672452ba182318e0fcc3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d240a8936f6a1d3ece06701e8c4d830a2eca8a8",
        "lessThan": "4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d240a8936f6a1d3ece06701e8c4d830a2eca8a8",
        "lessThan": "8173f7e2ce67e6ca1d4763f3da14e5b01ce77456",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "lib/rhashtable.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "lib/rhashtable.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64563

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41090 · Revision 1
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Publisher date
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