In the Linux kernel, the following vulnerability has been resolved:
perf/x86/intel/pt: Fix crash with stop filters in single-range mode
Add a check for !buf->single before calling pt_buffer_region_size in a place where a missing check can cause a kernel crash.
Fixes a bug introduced by commit 670638477aed ("perf/x86/intel/pt: Opportunistically use single range output mode"), which added a support for PT single-range output mode. Since that commit if a PT stop filter range is hit while tracing, the kernel will crash because of a null pointer dereference in pt_handle_status due to calling pt_buffer_region_size without a ToPA configured.
The commit which introduced single-range mode guarded almost all uses of the ToPA buffer variables with checks of the buf->single variable, but missed the case where tracing was stopped by the PT hardware, which happens when execution hits a configured stop filter.
Tested that hitting a stop filter while PT recording successfully records a trace with this patch but crashes without this patch.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade python-perfUpgrade perfUpgrade kernel-livepatch-5.10.102-99.473Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-headers | Aug 2, 2024 | Jun 20, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | Jun 20, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade kernelUpgrade bpftoolUpgrade kernel-tools | Oct 9, 2024 | Jun 20, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 20, 2024 |
| Suse | — | Upgrade kernel-azureUpgrade dlm-kmp-azureUpgrade kselftests-kmp-azureUpgrade kernel-devel-azureUpgrade kernel-azure-livepatch-develUpgrade kernel-rt-vdsoUpgrade kernel-syms-azureUpgrade kernel-rt-extraUpgrade kernel-rtUpgrade kernel-rt_debug-develUpgrade reiserfs-kmp-azureUpgrade dlm-kmp-rtUpgrade kernel-source-rtUpgrade gfs2-kmp-rtUpgrade kernel-azure-vdsoUpgrade kernel-rt-livepatch-develUpgrade kernel-syms-rtUpgrade kernel-azure-develUpgrade kernel-rt_debug-vdsoUpgrade kernel-rt-optionalUpgrade reiserfs-kmp-rtUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-rt-livepatchUpgrade kernel-azure-extraUpgrade ocfs2-kmp-rtUpgrade kselftests-kmp-rtUpgrade kernel-source-azureUpgrade gfs2-kmp-azureUpgrade kernel-azure-optionalUpgrade kernel-rt-develUpgrade kernel-devel-rtUpgrade ocfs2-kmp-azureUpgrade cluster-md-kmp-azureUpgrade cluster-md-kmp-rtUpgrade kernel-rt_debug | Aug 9, 2024 | Jun 20, 2024 |
| Ubuntu | — | Upgrade linux-intel-iotg-5.15 | Nov 19, 2024 | Jun 20, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jun 20, 2024 |
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