CVE-2026-72380
Xen pvcalls frontend OOB write allows kernel memory corruption from malicious backend.
Is CVE-2026-72380 being exploited?
Not confirmed. CVE-2026-72380 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-72380?
CVE-2026-72380 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-72380?
Yes. A fix has been recorded for CVE-2026-72380. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72380 affect?
CVE-2026-72380 affects Linux kernel (xen pvcalls frontend), PV guests (DomU) using pvcalls, Xen-based clouds and virtualization stacks. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72380?
Apply kernel updates, restrict/untrust backends, and monitor for backend anomalies.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A malicious or buggy Xen backend can trigger an out-of-bounds kernel write in PV frontend, causing crashes, memory corruption and possible guest compromise or escape.
Patch when possible
- affected>= 2195046bfd69e487d9a76dc47840f15c8412840c and < d1297a9e2fd6ce08678b370d41bc980ca798f809
- affected>= 2195046bfd69e487d9a76dc47840f15c8412840c and < d33846c8dcc06b83b7acdeac1e8bfbb5c0c26cb2
- affected4.15
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.