In the Linux kernel, the following vulnerability has been resolved:
tracing: Make sure trace_printk() can output as soon as it can be used
Currently trace_printk() can be used as soon as early_trace_init() is called from start_kernel(). But if a crash happens, and "ftrace_dump_on_oops" is set on the kernel command line, all you get will be:
[ 0.456075] <idle>-0 0dN.2. 347519us : Unknown type 6 [ 0.456075] <idle>-0 0dN.2. 353141us : Unknown type 6 [ 0.456075] <idle>-0 0dN.2. 358684us : Unknown type 6
This is because the trace_printk() event (type 6) hasn't been registered yet. That gets done via an early_initcall(), which may be early, but not early enough.
Instead of registering the trace_printk() event (and other ftrace events, which are not trace events) via an early_initcall(), have them registered at the same time that trace_printk() can be used. This way, if there is a crash before early_initcall(), then the trace_printk()s will actually be useful.
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 kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade python-perfUpgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade kernelUpgrade kernel-livepatch-5.10.167-147.601Upgrade perf-debuginfoUpgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernel-livepatch-4.14.305-227.531Upgrade kernel-livepatch-5.15.93-55.139Upgrade kernel-develUpgrade kernel-tools-develUpgrade perfUpgrade kernel-tools-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-debuginfo | May 21, 2025 | Mar 27, 2025 |
| Debian | — | Upgrade linux | Mar 31, 2025 | Mar 27, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade python3-perfUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernelUpgrade kernel-abi-stablelists | Jul 11, 2025 | Mar 27, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade bpftoolUpgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel | Jun 11, 2025 | Mar 27, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade kernelUpgrade python3-perfUpgrade bpftool | Jul 1, 2025 | Mar 27, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Mar 27, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.4Upgrade linux-azure-5.15Upgrade linux-raspiUpgrade linux-aws-hweUpgrade linux-azure-fipsUpgrade linux-oracle-5.15Upgrade linux-azure-4.15Upgrade linux-iotUpgrade linux-lowlatencyUpgrade linux-awsUpgrade linux-gkeopUpgrade linux-nvidia-tegra-5.15Upgrade linux-gkeUpgrade linux-hwe-5.15Upgrade linux-ibmUpgrade linux-gcp-5.4Upgrade linux-aws-5.4Upgrade linux-oracle-5.4Upgrade linux-hweUpgrade linux-ibm-5.4Upgrade linux-gcp-fipsUpgrade linuxUpgrade linux-aws-fipsUpgrade linux-gcp-4.15Upgrade linux-raspi-5.4Upgrade linux-azure-5.4Upgrade linux-gcpUpgrade linux-oracleUpgrade linux-nvidiaUpgrade linux-lowlatency-hwe-5.15Upgrade linux-fipsUpgrade linux-riscv-5.15Upgrade linux-gcp-5.15Upgrade linux-intel-iotgUpgrade linux-aws-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-kvmUpgrade linux-realtimeUpgrade linux-intel-iot-realtimeUpgrade linux-xilinx-zynqmpUpgrade linux-bluefieldUpgrade linux-azure | Apr 1, 2025 | Mar 27, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Mar 27, 2025 |
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