CVE-2026-53083

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

bpf: Fix RCU stall in bpf_fd_array_map_clear()

Add a missing cond_resched() in bpf_fd_array_map_clear() loop.

For PROG_ARRAY maps with many entries this loop calls

prog_array_map_poke_run() per entry which can be expensive, and

without yielding this can cause RCU stalls under load:

rcu: Stack dump where RCU GP kthread last ran:

CPU: 0 UID: 0 PID: 30932 Comm: kworker/0:2 Not tainted 6.14.0-13195-g967e8def1100 #2 PREEMPT(undef)

Workqueue: events prog_array_map_clear_deferred

RIP: 0010:write_comp_data+0x38/0x90 kernel/kcov.c:246

Call Trace:

<TASK>

prog_array_map_poke_run+0x77/0x380 kernel/bpf/arraymap.c:1096

__fd_array_map_delete_elem+0x197/0x310 kernel/bpf/arraymap.c:925

bpf_fd_array_map_clear kernel/bpf/arraymap.c:1000 [inline]

prog_array_map_clear_deferred+0x119/0x1b0 kernel/bpf/arraymap.c:1141

process_one_work+0x898/0x19d0 kernel/workqueue.c:3238

process_scheduled_works kernel/workqueue.c:3319 [inline]

worker_thread+0x770/0x10b0 kernel/workqueue.c:3400

kthread+0x465/0x880 kernel/kthread.c:464

ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153

ret_from_fork_asm+0x19/0x30 arch/x86/entry/entry_64.S:245

</TASK>