In the Linux kernel, the following vulnerability has been resolved:
perf trace: Really free the evsel->priv area
In 3cb4d5e00e037c70 ("perf trace: Free syscall tp fields in evsel->priv") it only was freeing if strcmp(evsel->tp_format->system, "syscalls") returned zero, while the corresponding initialization of evsel->priv was being performed if it was _not_ zero, i.e. if the tp system wasn't 'syscalls'.
Just stop looking for that and free it if evsel->priv was set, which should be equivalent.
Also use the pre-existing evsel_trace__delete() function.
This resolves these leaks, detected with:
$ make EXTRA_CFLAGS="-fsanitize=address" BUILD_BPF_SKEL=1 CORESIGHT=1 O=/tmp/build/perf-tools-next -C tools/perf install-bin
================================================================= ==481565==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 40 byte(s) in 1 object(s) allocated from: #0 0x7f7343cba097 in calloc (/lib64/libasan.so.8+0xba097) #1 0x987966 in zalloc (/home/acme/bin/perf+0x987966) #2 0x52f9b9 in evsel_trace__new /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:307 #3 0x52f9b9 in evsel__syscall_tp /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:333 #4 0x52f9b9 in evsel__init_raw_syscall_tp /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:458 #5 0x52f9b9 in perf_evsel__raw_syscall_newtp /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:480 #6 0x540e8b in trace__add_syscall_newtp /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3212 #7 0x540e8b in trace__run /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3891 #8 0x540e8b in cmd_trace /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:5156 #9 0x5ef262 in run_builtin /home/acme/git/perf-tools-next/tools/perf/perf.c:323 #10 0x4196da in handle_internal_command /home/acme/git/perf-tools-next/tools/perf/perf.c:377 #11 0x4196da in run_argv /home/acme/git/perf-tools-next/tools/perf/perf.c:421 #12 0x4196da in main /home/acme/git/perf-tools-next/tools/perf/perf.c:537 #13 0x7f7342c4a50f in __libc_start_call_main (/lib64/libc.so.6+0x2750f)
Direct leak of 40 byte(s) in 1 object(s) allocated from: #0 0x7f7343cba097 in calloc (/lib64/libasan.so.8+0xba097) #1 0x987966 in zalloc (/home/acme/bin/perf+0x987966) #2 0x52f9b9 in evsel_trace__new /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:307 #3 0x52f9b9 in evsel__syscall_tp /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:333 #4 0x52f9b9 in evsel__init_raw_syscall_tp /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:458 #5 0x52f9b9 in perf_evsel__raw_syscall_newtp /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:480 #6 0x540dd1 in trace__add_syscall_newtp /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3205 #7 0x540dd1 in trace__run /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:3891 #8 0x540dd1 in cmd_trace /home/acme/git/perf-tools-next/tools/perf/builtin-trace.c:5156 #9 0x5ef262 in run_builtin /home/acme/git/perf-tools-next/tools/perf/perf.c:323 #10 0x4196da in handle_internal_command /home/acme/git/perf-tools-next/tools/perf/perf.c:377 #11 0x4196da in run_argv /home/acme/git/perf-tools-next/tools/perf/perf.c:421 #12 0x4196da in main /home/acme/git/perf-tools-next/tools/perf/perf.c:537 #13 0x7f7342c4a50f in __libc_start_call_main (/lib64/libc.so.6+0x2750f)
SUMMARY: AddressSanitizer: 80 byte(s) leaked in 2 allocation(s). [root@quaco ~]#
With this we plug all leaks with "perf trace sleep 1".
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade kernel-toolsUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernelUpgrade kernel-livepatch-5.15.133-86.144Upgrade python-perfUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-tools-develUpgrade perf | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-6.1.55-75.123Upgrade python3-perfUpgrade python3-perf-debuginfoUpgrade kernel-libbpfUpgrade kernel-libbpf-staticUpgrade kernel-debuginfoUpgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade kernel-tools-develUpgrade kernel-toolsUpgrade kernel-libbpf-develUpgrade kernelUpgrade perfUpgrade perf-debuginfo | Oct 24, 2025 | Oct 7, 2025 |
| Debian | — | Upgrade linux | Oct 9, 2025 | Oct 9, 2025 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | Nov 14, 2025 | Oct 7, 2025 |
| Ubuntu | — | Upgrade linux-realtimeUpgrade linux-gcp-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-gcpUpgrade linux-bluefieldUpgrade linux-intel-iotg-5.15Upgrade linux-awsUpgrade linux-nvidia-tegra-igxUpgrade linux-lowlatency-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-gkeUpgrade linux-raspiUpgrade linux-hwe-5.15Upgrade linux-kvmUpgrade linux-xilinx-zynqmpUpgrade linux-riscv-5.15Upgrade linux-nvidiaUpgrade linux-ibmUpgrade linux-aws-fipsUpgrade linux-azureUpgrade linux-oracleUpgrade linux-azure-fdeUpgrade linux-azure-5.15Upgrade linux-nvidia-tegraUpgrade linux-ibm-5.15Upgrade linux-fipsUpgrade linux-intel-iotgUpgrade linux-nvidia-tegra-5.15Upgrade linuxUpgrade linux-lowlatencyUpgrade linux-aws-5.15Upgrade linux-oracle-5.15Upgrade linux-gkeop | Oct 10, 2025 | Oct 7, 2025 |
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