CVE-2026-72277
KVM (arm64) VNCR cache attribute bug can trigger SError, crashing VMs or host.
Is CVE-2026-72277 being exploited?
Not confirmed. CVE-2026-72277 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 0.19% probability of exploitation in the next 30 days.
How severe is CVE-2026-72277?
CVE-2026-72277 is rated Critical with a CVSS score of 9.3. 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-2026-72277?
Yes. A fix has been recorded for CVE-2026-72277. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72277 affect?
CVE-2026-72277 affects Linux kernel KVM (arm64), arm64 virtualization hosts, Cloud providers using arm64 VMs, Edge/embedded devices with KVM on arm64. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72277?
Apply upstream Linux kernel KVM security updates for arm64 and reboot hosts/VMs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A guest can trigger SError via VNCR cache attributes, causing guest crash or host/VM instability (denial of service).
Immediate action required
- affected>= 2a359e072596fcb2e9e85017a865e3618a2fe5b5 and < d5436e18e4fc2886ac306304d884ea3b92e1edbf
- affected>= 2a359e072596fcb2e9e85017a865e3618a2fe5b5 and < bc00e0e376ee3572f5d26c174473abef1e35decc
- affected>= 2a359e072596fcb2e9e85017a865e3618a2fe5b5 and < 4bd7dbe0b2243e6aa735cae4d5e1ff988b30b2a6
- affected6.16
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.