CVE-2023-54303
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.
How to fix
- Linux Linux3654ed5daf492463c3faa434c7000d45c2da2ace, a0ac32cf61e5a76e2429e486925a52ee41dd75e3, f2c67a3e60d1071b65848efaa8c3b66c363dd025 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 ≤ v < 3654ed5daf492463c3faa434c7000d45c2da2ace, 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 ≤ v < a0ac32cf61e5a76e2429e486925a52ee41dd75e3, 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 ≤ v < f2c67a3e60d1071b65848efaa8c3b66c363dd025, 6.0 | 3654ed5daf492463c3faa434c7000d45c2da2ace, a0ac32cf61e5a76e2429e486925a52ee41dd75e3, f2c67a3e60d1071b65848efaa8c3b66c363dd025 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.