In the Linux kernel, the following vulnerability has been resolved:
perf/x86/amd: Check event before enable to avoid GPF
On AMD machines cpuc->events[idx] can become NULL in a subtle race condition with NMI->throttle->x86_pmu_stop().
Check event for NULL in amd_pmu_enable_all() before enable to avoid a GPF. This appears to be an AMD only issue.
Syzkaller reported a GPF in amd_pmu_enable_all.
INFO: NMI handler (perf_event_nmi_handler) took too long to run: 13.143 msecs Oops: general protection fault, probably for non-canonical address 0xdffffc0000000034: 0000 PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000001a0-0x00000000000001a7] CPU: 0 UID: 0 PID: 328415 Comm: repro_36674776 Not tainted 6.12.0-rc1-syzk RIP: 0010:x86_pmu_enable_event (arch/x86/events/perf_event.h:1195 arch/x86/events/core.c:1430) RSP: 0018:ffff888118009d60 EFLAGS: 00010012 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000034 RSI: 0000000000000000 RDI: 00000000000001a0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 R13: ffff88811802a440 R14: ffff88811802a240 R15: ffff8881132d8601 FS: 00007f097dfaa700(0000) GS:ffff888118000000(0000) GS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200001c0 CR3: 0000000103d56000 CR4: 00000000000006f0 Call Trace: <IRQ> amd_pmu_enable_all (arch/x86/events/amd/core.c:760 (discriminator 2)) x86_pmu_enable (arch/x86/events/core.c:1360) event_sched_out (kernel/events/core.c:1191 kernel/events/core.c:1186 kernel/events/core.c:2346) __perf_remove_from_context (kernel/events/core.c:2435) event_function (kernel/events/core.c:259) remote_function (kernel/events/core.c:92 (discriminator 1) kernel/events/core.c:72 (discriminator 1)) __flush_smp_call_function_queue (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/csd.h:64 kernel/smp.c:135 kernel/smp.c:540) __sysvec_call_function_single (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./arch/x86/include/asm/trace/irq_vectors.h:99 arch/x86/kernel/smp.c:272) sysvec_call_function_single (arch/x86/kernel/smp.c:266 (discriminator 47) arch/x86/kernel/smp.c:266 (discriminator 47)) </IRQ>
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade python3-perf6.12Upgrade kernel-libbpf-develUpgrade kernel6.12-modules-extraUpgrade kernel6.12Upgrade perf-debuginfoUpgrade perf6.12Upgrade kernelUpgrade kernel-libbpfUpgrade kernel-debuginfo-common-x86_64Upgrade python3-perf6.12-debuginfoUpgrade python3-perfUpgrade kernel6.12-libbpf-develUpgrade bpftool6.12-debuginfoUpgrade kernel-libbpf-staticUpgrade kernel6.12-toolsUpgrade kernel6.12-headersUpgrade kernel-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel-headersUpgrade bpftool6.12Upgrade kernel6.12-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade kernel-modules-extraUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel-livepatch-6.1.161-183.298Upgrade kernel-modules-extra-commonUpgrade kernel-libbpf-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade perfUpgrade kernel6.12-libbpf-staticUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade kernel6.12-develUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-toolsUpgrade kernel-livepatch-6.12.64-87.122Upgrade bpftool-debuginfoUpgrade python3-perf-debuginfoUpgrade perf6.12-debuginfoUpgrade kernel6.12-libbpfUpgrade kernel6.12-libbpf-debuginfo | Feb 20, 2026 | Jan 13, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Feb 11, 2026 | Feb 11, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Feb 24, 2026 | Jan 13, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Jan 13, 2026 |
| Ubuntu | — | Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-6.8.0-1054-gcp-64kUpgrade linux-image-6.8.0-1049-oracleUpgrade linux-image-oem-24.04Upgrade linux-image-oem-22.04bUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-generic-6.8Upgrade linux-image-gcpUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-fips-6.8Upgrade linux-image-virtual-6.17Upgrade linux-image-oem-22.04cUpgrade linux-image-6.17.0-1010-realtimeUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-6.8.0-1054-gcpUpgrade linux-image-gcp-6.8Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-gkeopUpgrade linux-image-aws-6.17Upgrade linux-image-6.8.0-1051-nvidiaUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-6.8.0-110-lowlatency-64kUpgrade linux-image-6.17.0-1011-oracleUpgrade linux-image-6.8.0-1049-oracle-64kUpgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-aws-64kUpgrade linux-image-6.8.0-110-fipsUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-oracleUpgrade linux-image-nvidiaUpgrade linux-image-nvidia-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-azure-fips-6.8Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-intel-iotgUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-gkeUpgrade linux-image-oem-22.04Upgrade linux-image-generic-64kUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-oem-24.04bUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-6.8.0-1054-gcp-fipsUpgrade linux-image-6.8.0-1022-nvidia-tegra-rtUpgrade linux-image-realtimeUpgrade linux-image-oem-24.04dUpgrade linux-image-genericUpgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1059-azureUpgrade linux-image-lowlatency-64kUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-raspi-realtimeUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-oracle-64kUpgrade linux-image-raspi-6.17Upgrade linux-image-xilinxUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-gcp-6.17Upgrade linux-image-virtualUpgrade linux-image-6.8.0-1051-ibmUpgrade linux-image-azure-6.8Upgrade linux-image-gke-6.8Upgrade linux-image-6.17.0-1012-gcp-64kUpgrade linux-image-6.17.0-1020-oemUpgrade linux-image-6.8.0-1051-nvidia-64kUpgrade linux-image-nvidia-tegraUpgrade linux-image-oem-24.04aUpgrade linux-image-realtime-6.17Upgrade linux-image-6.8.0-1054-azureUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.17.0-1014-raspiUpgrade linux-image-6.17.0-1012-gcpUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-ibm-classicUpgrade linux-image-azure-6.17Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-110-generic-64kUpgrade linux-image-6.8.0-1051-nvidia-lowlatencyUpgrade linux-image-realtime-6.8.1Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-1054-azure-fipsUpgrade linux-image-oem-22.04aUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-azure-fipsUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-1050-gke-64kUpgrade linux-image-6.17.0-22-generic-64kUpgrade linux-image-oracle-6.17Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-6.8.0-1052-raspiUpgrade linux-image-generic-64k-6.17Upgrade linux-image-6.8.0-1052-awsUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-oem-24.04cUpgrade linux-image-virtual-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-generic-6.17Upgrade linux-image-gcp-64k-6.17Upgrade linux-image-6.17.0-1012-aws-64kUpgrade linux-image-6.17.0-1013-azureUpgrade linux-image-aws-fipsUpgrade linux-image-aws-64k-6.17Upgrade linux-image-6.8.1-1047-realtimeUpgrade linux-image-oem-6.17Upgrade linux-image-xilinx-6.8Upgrade linux-image-azure-lts-24.04Upgrade linux-image-6.17.0-1011-oracle-64kUpgrade linux-image-nvidia-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-lowlatencyUpgrade linux-image-azureUpgrade linux-image-raspiUpgrade linux-image-fipsUpgrade linux-image-aws-lts-24.04Upgrade linux-image-awsUpgrade linux-image-aws-fips-6.8Upgrade linux-image-gke-64k-6.8Upgrade linux-image-gcp-fipsUpgrade linux-image-6.8.0-110-lowlatencyUpgrade linux-image-6.8.0-1052-aws-fipsUpgrade linux-image-raspi-6.8Upgrade linux-image-6.17.0-1012-awsUpgrade linux-image-oem-22.04dUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1051-nvidia-lowlatency-64kUpgrade linux-image-kvmUpgrade linux-image-6.17.0-22-genericUpgrade linux-image-generic-64k-6.8Upgrade linux-image-6.8.0-2042-raspi-realtimeUpgrade linux-image-6.8.0-110-genericUpgrade linux-image-gke-64kUpgrade linux-image-lowlatency-6.8Upgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-1050-gkeUpgrade linux-image-6.8.0-1037-gkeopUpgrade linux-image-6.8.0-1022-nvidia-tegraUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-oracle-6.8Upgrade linux-image-ibmUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.8.0-1052-aws-64k | Apr 17, 2026 | Jan 13, 2026 |
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