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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-64073 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT On PREEMPT_RT, non-HARD irq_work runs in per-CPU kthreads via run_irq_workd(), so irq_work_sync() uses rcuwait() to wait for BUSY==0. After irq_work_single() clears BUSY via atomic_cmpxchg(), it still dereferences @work for irq_work_is_hard() and rcuwait_wake_up(). An irq_work_sync() caller on another CPU that enters after BUSY is cleared can observe BUSY==0 immediately, return, and free the work before those accesses complete — causing a use-after-free. Fix this by wrapping run_irq_workd() in guard(rcu)() so that the entire irq_work_single() execution is within an RCU read-side critical section. Then add synchronize_rcu() in irq_work_sync() after rcuwait_wait_event() to ensure the caller waits for the RCU grace period before returning, preventing premature frees.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/18c0456ea2615b1a743a6db739c74411c3b42bc6 kernel.org
https://git.kernel.org/stable/c/2dc79362302922cb18f35e262712b5e58de65442 kernel.org
https://git.kernel.org/stable/c/684a78183c54c23e70d1cba320f7fc184604210b kernel.org
https://git.kernel.org/stable/c/81b582784518196eff1050212a046bc29d3a05dd kernel.org
https://git.kernel.org/stable/c/91840be8f710370607f949a627e070896faeddb8 kernel.org
https://git.kernel.org/stable/c/eef4f71b46a9929ac33e968538c9dd5d96a02460 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-64073
NVD Published Date:
07/19/2026
NVD Last Modified:
07/20/2026
Source:
kernel.org