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Review reviewHigh

CVE-2026-53360

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use As per the GHCB spec, when using GHCB v2+ require the software scratch area to reside in the GHCB's shared buffer. Note, things like Page State Change (PSC) requests _rely_ on this behavior, as the guest can't provide a length when making the request, i.e. the size of the guest payload is bounded by the size of the shared buffer. Failure to force usage of the GHCB, and a slew of other flaws, lets a malicious SNP guest corrupt host kernel heap memory, and leak host...

CVSS
8.8
EPSS
0.18%
8.15% percentile
CISA KEV
Not listed
Published
2026.07.04
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.18%
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use As per the GHCB spec, when using GHCB v2+ require the software scratch area to reside in the GHCB's shared buffer. Note, things like Page State Change (PSC) requests _rely_ on this behavior, as the guest can't provide a length when making the request, i.e. the size of the guest payload is bounded by the size of the shared buffer. Failure to force usage of the GHCB, and a slew of other flaws, lets a malicious SNP guest corrupt host kernel heap memory, and leak host...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 4af663c2f64a8d252e690c60cf8b8abf22dc2951 < bf9ba093fbb83c0c9a3dedd50efec29424eca2fc, >= 4af663c2f64a8d252e690c60cf8b8abf22dc2951 < c9b4198fbc6ed99a9da4bee9f74bb730f926c9ae, >= 4af663c2f64a8d252e690c60cf8b8abf22dc2951 < b328ede59ac34e7998e1eee5e5f0cc26c2a91846, >= 4af663c2f64a8d252e690c60cf8b8abf22dc2951 < db3f2195d29344a3cf1e9dd9ab7f21ced7308cf7, >= 6.10, >= 6.10 < 6.12.93, >= 6.13 < 6.18.35, >= 6.19 < 7.0.12, 7.1
Fixed versions
6.12.93, 6.18.35, 7.0.12

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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:L/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-125