Is there a public exploit for CVE-2026-99159?

No public exploit for CVE-2026-99159 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 the sub-buffer array base in rbmetasubbufidx() On a…

CVE-2026-99159

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix the sub-buffer array base in rbmetasubbufidx() On a persistent ring buffer, rbmetasubbufidx() can return an index one sub-buffer too high. rbsetupidsmetapage() then fills subbufids[] shifted by one and leaves subbufids[0] NULL, which rbmapvma() dereferences when userspace maps tracepiperaw. rbupdatemetareader() writes two such indices into meta->buffers[], which rbcpumetavalid() would reject on the next boot, discarding the previous boot's trace. A CPU's sub-buffer array starts after its meta header and the nrsubbufs integers that follow, aligned up to a sub-buffer. rbmetasubbufidx() inverts that calculation but skips only the integers, not the header, so its base is one sub-buffer low whenever the omitted header size crosses the alignment boundary. Invert the calculation with rbsubbufsfrommeta() rather than repeating it. rbrangebuffer() maps an index back to an address through the same helper, so the two directions can no longer disagree.

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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