Local system hang via timer lock inversion
Published Jun 25, 2026 · Updated Jun 25, 2026
Improper locking in Linux Kernel IP-TFS state teardown allows local users to hang SMP systems through a timer callback race. iptfs_destroy_state() cancels output and drop hrtimers while holding x->lock or drop_lock, but each softirq timer callback acquires the same lock, creating an ABBA deadlock across CPUs. Triggering requires local low-privileged access and IP-TFS state destruction to overlap an executing timer callback on another CPU; the bounded consequence is a system hang.
Summary
What happened
Improper locking in Linux Kernel IP-TFS state teardown allows local users to hang SMP systems through a timer callback race. iptfs_destroy_state() cancels output and drop hrtimers while holding x->lock or drop_lock, but each softirq timer callback acquires the same lock, creating an ABBA deadlock across CPUs. Triggering requires local low-privileged access and IP-TFS state destruction to overlap an executing timer callback on another CPU; the bounded consequence is a system hang.
The record
- CVE
- CVE-2026-53197
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-667, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 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=4b3faf610cc63bfac972711635eafbca5e7d7117 <822b98d354e63e8249e85473c5f3c519f3c9cecc
- Affected versionversion=4b3faf610cc63bfac972711635eafbca5e7d7117 <a13ca53e47e500854a3b9ec18b5dc83acfec863e
- Affected versionversion=4b3faf610cc63bfac972711635eafbca5e7d7117 <c8a8a75b733467b00c08b91a38dbaf207a08ed6e
- Affected versionversion=6.14
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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