CVE-2026-23311

Summary

In the Linux kernel, the following vulnerability has been resolved:

perf/core: Fix invalid wait context in ctx_sched_in()

Lockdep found a bug in the event scheduling when a pinned event was failed and wakes up the threads in the ring buffer like below.

It seems it should not grab a wait-queue lock under perf-context lock. Let's do it with irq_work.

[ 39.913691] ============================= [ 39.914157] [ BUG: Invalid wait context ] [ 39.914623] 6.15.0-next-20250530-next-2025053 #1 Not tainted [ 39.915271] —————————– [ 39.915731] repro/837 is trying to lock: [ 39.916191] ffff88801acfabd8 (&event->waitq){….}-{3:3}, at: __wake_up+0x26/0x60 [ 39.917182] other info that might help us debug this: [ 39.917761] context-{5:5} [ 39.918079] 4 locks held by repro/837: [ 39.918530] #0: ffffffff8725cd00 (rcu_read_lock){….}-{1:3}, at: __perf_event_task_sched_in+0xd1/0xbc0 [ 39.919612] #1: ffff88806ca3c6f8 (&cpuctx_lock){….}-{2:2}, at: __perf_event_task_sched_in+0x1a7/0xbc0 [ 39.920748] #2: ffff88800d91fc18 (&ctx->lock){….}-{2:2}, at: __perf_event_task_sched_in+0x1f9/0xbc0 [ 39.921819] #3: ffffffff8725cd00 (rcu_read_lock){….}-{1:3}, at: perf_event_wakeup+0x6c/0x470

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/c67ab059953e3b66cb17ddd6524c23f9e1f6526d
• https://git.kernel.org/stable/c/825f218ca70ef394c2b8546b313711d867b24584
• https://git.kernel.org/stable/c/486ff5ad49bc50315bcaf6d45f04a33ef0a45ced

• ←Previous
• Next→