CVE-2026-99237
tracing: Hold trace_types_lock when resetting last boot data from readers
What happened?
In the Linux kernel, the following vulnerability has been resolved:
tracing: Hold trace_types_lock when resetting last boot data from readers
update_last_data_if_empty() is called from tracing_open() with O_TRUNC, tracing_read_pipe() and tracing_buffers_read() without trace_types_lock. Two readers can both pass the LAST_BOOT test and free module_delta twice, and a module notifier can update module_delta while it is being freed.
Take trace_types_lock in those paths and keep the callers that already hold it on an unlocked variant.
Affected software and versions
| Software | Version information | Fixed version |
|---|---|---|
| LinuxLinux | affected: 32dc0042528d385d83bf458e4cf3a49c5110afea to < 92b69f6db640dadc0851762ee2e12db99f083cad; affected: 32dc0042528d385d83bf458e4cf3a49c5110afea to < d6d991afe775ab7fcf89523a2502b7ca3be56ffd; affected: 32dc0042528d385d83bf458e4cf3a49c5110afea to < 1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa; affected: 32dc0042528d385d83bf458e4cf3a49c5110afea to < 5a6bd62f09147b49b31fd19d4eba122cb5f941a1 | See vendor advisory |
| LinuxLinux | affected: 6.16; unaffected: 0 to < 6.16; unaffected: 6.18.60 to ≤ 6.18.*; unaffected: 7.2.14 to ≤ 7.2.*; unaffected: 7.3.1 to ≤ 7.3.*; unaffected: 7.4-rc1 to ≤ * | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.
Sources and remediation references
- https://www.cve.org/CVERecord?id=CVE-2026-99237
- https://git.kernel.org/stable/c/92b69f6db640dadc0851762ee2e12db99f083cad
- https://git.kernel.org/stable/c/d6d991afe775ab7fcf89523a2502b7ca3be56ffd
- https://git.kernel.org/stable/c/1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa
- https://git.kernel.org/stable/c/5a6bd62f09147b49b31fd19d4eba122cb5f941a1