Is there a public exploit for CVE-2026-99266?

No public exploit for CVE-2026-99266 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.

What does CVE-2026-99266 affect?

CVE-2026-99266 affects Linux Linux.

— Unscored

In the Linux kernel, the following vulnerability has been resolved: iouring/zcrx: fix buffer offsets in areas above 4GB iozcrxqueuecqe()…

CVE-2026-99266

In the Linux kernel, the following vulnerability has been resolved: iouring/zcrx: fix buffer offsets in areas above 4GB iozcrxqueuecqe() computes the offset of the buffer in its area from netiovidx(), which is an unsigned int, so the shift is done in 32 bits and only the result is widened to the u64 that goes into the CQE. An area can be up to 1TB in size. For every niov beyond the first 4GB the CQE points the application at a buffer 4GB, or a multiple of that, below the one which has the data. It reads the wrong data, and then returns a buffer it doesn't own via the refill queue while the real one is never given back.

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: 3 November 2026
Last updated: 3 November 2026
Affected: Linux · Linux
Assigner: Linux

At the source

EUVD (ENISA)

References

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