Bug 2516237 (CVE-2026-72309)

Summary: CVE-2026-72309 kernel: tracing/remotes: Fix leak in trace_remote_alloc_buffer() error path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's tracing/remotes component. This vulnerability occurs when a page allocation fails within the `trace_remote_alloc_buffer()` function. Due to an unincremented CPU counter, a partially allocated buffer descriptor (rb_desc) is not properly freed, leading to a memory leak. Over time, this memory leak could potentially lead to a Denial of Service (DoS) condition.
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Description OSIDB Bzimport 2026-08-15 06:02:01 UTC 
In the Linux kernel, the following vulnerability has been resolved:

tracing/remotes: Fix leak in trace_remote_alloc_buffer() error path

If page allocation fails in trace_remote_alloc_buffer(), desc->nr_cpus
is not yet incremented for the current CPU. As a consequence, on error,
half-allocated rb_desc will not be freed in trace_remote_free_buffer().

Increment desc->nr_cpus as soon as the first allocation for the current
CPU has succeeded.
Comment 1 gkamathe 2026-08-17 11:13:20 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081504-CVE-2026-72309-c118@gregkh/T