In the Linux kernel, the following vulnerability has been resolved:
tracing: Free error logs of tracing instances
When a tracing instance is removed, the error messages that hold errors that occurred in the instance needs to be freed. The following reports a memory leak:
# cd /sys/kernel/tracing # mkdir instances/foo # echo 'hist:keys=x' > instances/foo/events/sched/sched_switch/trigger # cat instances/foo/error_log [ 117.404795] hist:sched:sched_switch: error: Couldn't find field Command: hist:keys=x ^ # rmdir instances/foo
Then check for memory leaks:
# echo scan > /sys/kernel/debug/kmemleak # cat /sys/kernel/debug/kmemleak unreferenced object 0xffff88810d8ec700 (size 192): comm "bash", pid 869, jiffies 4294950577 (age 215.752s) hex dump (first 32 bytes): 60 dd 68 61 81 88 ff ff 60 dd 68 61 81 88 ff ff `.ha....`.ha.... a0 30 8c 83 ff ff ff ff 26 00 0a 00 00 00 00 00 .0......&....... backtrace: [<00000000dae26536>] kmalloc_trace+0x2a/0xa0 [<00000000b2938940>] tracing_log_err+0x277/0x2e0 [<000000004a0e1b07>] parse_atom+0x966/0xb40 [<0000000023b24337>] parse_expr+0x5f3/0xdb0 [<00000000594ad074>] event_hist_trigger_parse+0x27f8/0x3560 [<00000000293a9645>] trigger_process_regex+0x135/0x1a0 [<000000005c22b4f2>] event_trigger_write+0x87/0xf0 [<000000002cadc509>] vfs_write+0x162/0x670 [<0000000059c3b9be>] ksys_write+0xca/0x170 [<00000000f1cddc00>] do_syscall_64+0x3e/0xc0 [<00000000868ac68c>] entry_SYSCALL_64_after_hwframe+0x72/0xdc unreferenced object 0xffff888170c35a00 (size 32): comm "bash", pid 869, jiffies 4294950577 (age 215.752s) hex dump (first 32 bytes): 0a 20 20 43 6f 6d 6d 61 6e 64 3a 20 68 69 73 74 . Command: hist 3a 6b 65 79 73 3d 78 0a 00 00 00 00 00 00 00 00 :keys=x......... backtrace: [<000000006a747de5>] __kmalloc+0x4d/0x160 [<000000000039df5f>] tracing_log_err+0x29b/0x2e0 [<000000004a0e1b07>] parse_atom+0x966/0xb40 [<0000000023b24337>] parse_expr+0x5f3/0xdb0 [<00000000594ad074>] event_hist_trigger_parse+0x27f8/0x3560 [<00000000293a9645>] trigger_process_regex+0x135/0x1a0 [<000000005c22b4f2>] event_trigger_write+0x87/0xf0 [<000000002cadc509>] vfs_write+0x162/0x670 [<0000000059c3b9be>] ksys_write+0xca/0x170 [<00000000f1cddc00>] do_syscall_64+0x3e/0xc0 [<00000000868ac68c>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
The problem is that the error log needs to be freed when the instance is removed.
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 kernelUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.108-65.141Upgrade bpftool-debuginfoUpgrade kernel-headersUpgrade python-perfUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade bpftoolUpgrade kernel-livepatch-5.10.178-162.673Upgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade perfUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-toolsUpgrade bpftoolUpgrade kernel-libbpf-staticUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade perfUpgrade kernel-livepatch-6.1.25-37.47Upgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade kernel-libbpf-develUpgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade python3-perfUpgrade kernel-tools-develUpgrade kernel-libbpfUpgrade kernel | Oct 16, 2025 | Sep 18, 2025 |
| Debian | — | Upgrade linux | Sep 22, 2025 | Sep 22, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade kernelUpgrade python3-perf | Dec 12, 2025 | Dec 11, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 18, 2025 |
| Ubuntu | — | Upgrade linux-iotUpgrade linux-lowlatency-hwe-5.15Upgrade linux-hwe-5.4Upgrade linux-hwe-5.15Upgrade linux-gcp-fipsUpgrade linux-ibm-5.4Upgrade linuxUpgrade linux-raspi-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-nvidia-tegra-igxUpgrade linux-azureUpgrade linux-nvidia-tegra-5.15Upgrade linux-awsUpgrade linux-gcp-5.4Upgrade linux-bluefieldUpgrade linux-azure-5.4Upgrade linux-ibm-5.15Upgrade linux-riscv-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-aws-5.4Upgrade linux-intel-iotgUpgrade linux-oracleUpgrade linux-kvmUpgrade linux-oracle-5.15Upgrade linux-gkeopUpgrade linux-oracle-5.4Upgrade linux-gcp-5.15Upgrade linux-nvidiaUpgrade linux-aws-fipsUpgrade linux-lowlatencyUpgrade linux-azure-fipsUpgrade linux-fipsUpgrade linux-gkeUpgrade linux-aws-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-realtimeUpgrade linux-ibmUpgrade linux-gcpUpgrade linux-azure-5.15Upgrade linux-nvidia-tegraUpgrade linux-raspi | Sep 26, 2025 | Sep 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 18, 2025 |
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