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Vulnerabilities

Vulnerability · CVE-2026-23425

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix ID register initialization for non-protected pKVM guests In protected mode, the hyp…

Published Apr 3, 2026 · catalog updated Jul 21, 2026 · linux kernel

Check if you run it

No confirmed exploitation is on record for CVE-2026-23425. EPSS is 0.12%. Act only if a listed version of linux kernel is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.12%
Remediation
Advisory link
Affected products
cpe linux/linux kernel

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix ID register initialization for non-protected pKVM guests In protected mode, the hypervisor maintains a separate instance of the structure for each VM. For non-protected VMs, this structure is initialized from the host's state. Currently, copies the flag from the host without the underlying data being initialized. This results in the hypervisor seeing the flag as set while the ID registers remain zeroed. Consequently, checks at EL2 fail (return 0) for non-protected VMs. This breaks logic that relies on feature detection, such as for TCR2_EL1 support. As a result, certain system registers (e.g., TCR2_EL1, PIR_EL1, POR_EL1) are not saved/restored during the world switch, which could lead to state corruption. Fix this by explicitly copying the ID registers from the host to the hypervisor for non-protected VMs during initialization, since we trust the host with its non-protected guests' features. Also ensure is cleared initially in so that can properly initialize them and set the flag once done.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe linux/linux kernel6.14
  • cpe linux/linux kernel7.0

How to fix CVE-2026-23425

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-23425. EPSS is 0.12%. Act only if a listed version of linux kernel is installed.

Which versions are affected?

Compare what you have installed with linux/linux kernel 6.14; linux/linux kernel 7.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.12%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 3, 2026 · NIST NVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix ID register initialization for non-protected pKVM guests In protected mode, the hypervisor maintains a separate instance of the structure for each VM. For non-protected VMs, this structure is initialized from the host's state. Currently, copies the flag from the host without the underlying data being initialized. T

  2. Jul 21, 2026 · NIST NVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix ID register initialization for non-protected pKVM guests In protected mode, the hypervisor maintains a separate instance of the structure for each VM. For non-protected VMs, this structure is initialized from the host's state. Currently, copies the flag from the host without the underlying data being initialized. T

Sources

  • CVE.orgVulnerability recordCVE-2026-23425

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-23425

    30-day exploitation probability 0.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-23425

    In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix ID register initialization for non-protected pKVM guests In protected mode, the hypervisor maintains a separate instance of the structure for each VM. For non-protected VMs, this structure

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.