Is there a public exploit for CVE-2026-99158?

No public exploit for CVE-2026-99158 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

— Unscored

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix false warning in ringbuffermapgetreader() The mmap…

CVE-2026-99158

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix false warning in ringbuffermapgetreader() The mmap reader can warn when it catches up with a writer that is still committing events. rbgetreaderpage() returns NULL in this case, but ringbuffermapgetreader() treats that result as an error. The initial rbpercpuempty() check filters out an empty buffer, but it does not guarantee that the next reader page has committed data. Writers do not take readerlock and can advance commitpage before publishing the committed length on the new page. rbgetreaderpage() can swap to that page, catch up with the writer and return NULL. Handle NULL through the existing no-data exit without warning. Remove the caller's readerpage == commitpage check as well, since the reader-page helper already handles that case. The existing metadata update and return path remain in place.

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 October 2026
Last updated: 30 October 2026
Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

At the source

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