Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 810979682ccc98dbd83f341c18a2e556c30a7164 before 2dc79362302922cb18f35e262712b5e58de65442; affected 810979682ccc98dbd83f341c18a2e556c30a7164 before eef4f71b46a9929ac33e968538c9dd5d96a02460; affected 810979682ccc98dbd83f341c18a2e556c30a7164 before 684a78183c54c23e70d1cba320f7fc184604210b; affected 810979682ccc98dbd83f341c18a2e556c30a7164 before 18c0456ea2615b1a743a6db739c74411c3b42bc6; affected 810979682ccc98dbd83f341c18a2e556c30a7164 before 81b582784518196eff1050212a046bc29d3a05dd; affected 810979682ccc98dbd83f341c18a2e556c30a7164 before 91840be8f710370607f949a627e070896faeddb8 |
| Linux / Linux | affected 5.16; unaffected 0 before 5.16; unaffected 6.1.175 through 6.1.*; unaffected 6.6.142 through 6.6.*; unaffected 6.12.92 through 6.12.*; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/2dc79362302922cb18f35e262712b5e58de65442
- https://git.kernel.org/stable/c/eef4f71b46a9929ac33e968538c9dd5d96a02460
- https://git.kernel.org/stable/c/684a78183c54c23e70d1cba320f7fc184604210b
- https://git.kernel.org/stable/c/18c0456ea2615b1a743a6db739c74411c3b42bc6
- https://git.kernel.org/stable/c/81b582784518196eff1050212a046bc29d3a05dd
- https://git.kernel.org/stable/c/91840be8f710370607f949a627e070896faeddb8
ADP enrichment
No English description supplied.
No references supplied.