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ReviewHigh

CVE-2026-74516

Linux

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active Always update x2APIC MSR intercepts for L1 when AVIC is deactivated, even if L2 is active and KVM is using a separate MSR bitmap to run L2. If AVIC is fully enabled prior to running L2, and is then inhibited while L2 is active (for a VM-scoped inhibit), then KVM will run L1 with AVIC disabled, but with x2APIC MSR intercepts disabled, i.e. will allow L1 to read most of the host's APIC state, send arbitrary interrupts, change task priority, and ult...

CVSS
8.2
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.15
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.2

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active Always update x2APIC MSR intercepts for L1 when AVIC is deactivated, even if L2 is active and KVM is using a separate MSR bitmap to run L2. If AVIC is fully enabled prior to running L2, and is then inhibited while L2 is active (for a VM-scoped inhibit), then KVM will run L1 with AVIC disabled, but with x2APIC MSR intercepts disabled, i.e. will allow L1 to read most of the host's APIC state, send arbitrary interrupts, change task priority, and ult...

Affected product and versions

Product
Linux
Affected versions
>= 091abbf578f926e763adc0f577baeb7f405b4bdc < 4ca05385b3ddbd463be17c6d69ec76fca657081d, >= 091abbf578f926e763adc0f577baeb7f405b4bdc < 6664a5aea45318f4ec156a729949b474dd6e3159, >= 091abbf578f926e763adc0f577baeb7f405b4bdc < f12373625b4dc9bcc89c41872648878c73bb9272, >= 091abbf578f926e763adc0f577baeb7f405b4bdc < 7668c58dcf465559dc7a0d2e95e9cb79cf47454b, >= 091abbf578f926e763adc0f577baeb7f405b4bdc < 89f9e8398e79c49886766fc24a84c37726231104, >= 091abbf578f926e763adc0f577baeb7f405b4bdc < 7d3aae206663c4e006b25a1c7a20a4029e67da76, >= 6.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
Not available