Bug 2565279 (CVE-2026-99237)

Summary: CVE-2026-99237 kernel: kernel: privilege escalation via race condition in tracing subsystem
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's tracing subsystem. A race condition exists due to missing locking when resetting trace data during concurrent reader operations. A local attacker with access to tracing interfaces can exploit this vulnerability by performing concurrent file operations, triggering memory corruption such as a use-after-free or double-free condition. Successful exploitation could allow an attacker to escalate privileges, execute arbitrary code in the kernel, or cause a Denial of Service (DoS) by crashing the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-02 16:47:32 UTC 
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.