Is there a public exploit for CVE-2026-99233?

No public exploit for CVE-2026-99233 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.

How severe is CVE-2026-99233?

CVE-2026-99233 scores CVSS 7.8 (v3.1), rated high.

What does CVE-2026-99233 affect?

CVE-2026-99233 affects Linux Linux.

7.8 High

In the Linux kernel, the following vulnerability has been resolved: tracing/histograms: Verify eventcall identity when updating synthevent…

CVE-2026-99233

In the Linux kernel, the following vulnerability has been resolved: tracing/histograms: Verify eventcall identity when updating synthevent refcount In eventhisttriggerparse() and histunregall(), the histogram registration and unregistration paths look up findsynthevent() using traceeventname(file->eventcall) and adjust se->ref if a match is found. Because findsynthevent() only compares the event basename, registering or removing a histogram on a non-synthetic trace event whose basename matches a synthetic event erroneously modifies the synthetic event's reference count. If a histogram is registered on the non-synthetic event before the synthetic event is created and removed afterwards, se->ref is decremented without a matching increment, allowing the synthetic event to be freed while an active histogram action still holds a pointer to it. Introduce findsyntheventcall() to verify that &se->call matches file->eventcall before adjusting se->ref.

Assessment

CVSS: 7.8 (v3.1)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 2 November 2026
Last updated: 2 November 2026
Affected: Linux · Linux
Assigner: Linux

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

At the source

EUVD (ENISA)

References

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