Local privilege escalation via stale rhashtable iterator
Published Aug 4, 2026 · Updated Aug 4, 2026
Use-after-free in the Linux rhashtable iterator allows local users to elevate privileges or crash the host through concurrent socket churn. When a resize frees the walker's table, rhashtable_walk_start_check resets its position without clearing iter->p, and rhashtable_walk_next dereferences the freed object. An unprivileged local user can race multi-fragment NETLINK_SOCK_DIAG or TIPC dumps with socket creation and deletion; remote packet processing does not reach the flaw.
Summary
What happened
Use-after-free in the Linux rhashtable iterator allows local users to elevate privileges or crash the host through concurrent socket churn. When a resize frees the walker's table, rhashtable_walk_start_check resets its position without clearing iter->p, and rhashtable_walk_next dereferences the freed object. An unprivileged local user can race multi-fragment NETLINK_SOCK_DIAG or TIPC dumps with socket creation and deletion; remote packet processing does not reach the flaw.
The record
- CVE
- CVE-2026-64563
- Published
- Aug 4, 2026
- Updated
- Aug 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-825, T1068, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 4, 2026CVE publishedPublication date reported by the CVE source.
- Aug 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.18
- Affected versionversion=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <3ff7c1dbf722cf3fa538672452ba182318e0fcc3
- Affected versionversion=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3
- Affected versionversion=5d240a8936f6a1d3ece06701e8c4d830a2eca8a8 <8173f7e2ce67e6ca1d4763f3da14e5b01ce77456
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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