Riskcovery

CVE-2023-54303

bpf: Disable preemption in bpf_perf_event_output

State
Published
Severity
7.8 High
Published
Dec 30, 2025
Updated
Aug 5, 2026
Reserved
Dec 30, 2025

Read the record on cve.org

Description

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

bpf: Disable preemption in bpf_perf_event_output

The nesting protection in bpf_perf_event_output relies on disabled preemption, which is guaranteed for kprobes and tracepoints.

However bpf_perf_event_output can be also called from uprobes context through bpf_prog_run_array_sleepable function which disables migration, but keeps preemption enabled.

This can cause task to be preempted by another one inside the nesting protection and lead eventually to two tasks using same perf_sample_data buffer and cause crashes like:

kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffffffff82be3eea ... Call Trace: ? __die+0x1f/0x70 ? page_fault_oops+0x176/0x4d0 ? exc_page_fault+0x132/0x230 ? asm_exc_page_fault+0x22/0x30 ? perf_output_sample+0x12b/0x910 ? perf_event_output+0xd0/0x1d0 ? bpf_perf_event_output+0x162/0x1d0 ? bpf_prog_c6271286d9a4c938_krava1+0x76/0x87 ? __uprobe_perf_func+0x12b/0x540 ? uprobe_dispatcher+0x2c4/0x430 ? uprobe_notify_resume+0x2da/0xce0 ? atomic_notifier_call_chain+0x7b/0x110 ? exit_to_user_mode_prepare+0x13e/0x290 ? irqentry_exit_to_user_mode+0x5/0x30 ? asm_exc_int3+0x35/0x40

Fixing this by disabling preemption in bpf_perf_event_output.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 to before 3654ed5daf492463c3faa434c7000d45c2da2aceAffected
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 to before a0ac32cf61e5a76e2429e486925a52ee41dd75e3Affected
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 to before f2c67a3e60d1071b65848efaa8c3b66c363dd025Affected
LinuxLinux
  • 6.0Affected
  • before 6.0Not affected
  • 6.1.45 through 6.1.*Not affected
  • 6.4.10 through 6.4.*Not affected
  • 6.5 and laterNot affected

References

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