SECUFOCUSNOW
Home›CVE index›CVE-2025-40038
Review reviewHigh

CVE-2025-40038

Linux

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Skip fastpath emulation on VM-Exit if next RIP isn't valid Skip the WRMSR and HLT fastpaths in SVM's VM-Exit handler if the next RIP isn't valid, e.g. because KVM is running with nrips=false. SVM must decode and emulate to skip the instruction if the CPU doesn't provide the next RIP, and getting the instruction bytes to decode requires reading guest memory. Reading guest memory through the emulator can fault, i.e. can sleep, which is disallowed since the fastpath handlers run with IRQs disabled. BUG: sleeping func...

CVSS
7.1
EPSS
0.17%
6.17% percentile
CISA KEV
Not listed
Published
2025.10.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.17%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Skip fastpath emulation on VM-Exit if next RIP isn't valid Skip the WRMSR and HLT fastpaths in SVM's VM-Exit handler if the next RIP isn't valid, e.g. because KVM is running with nrips=false. SVM must decode and emulate to skip the instruction if the CPU doesn't provide the next RIP, and getting the instruction bytes to decode requires reading guest memory. Reading guest memory through the emulator can fault, i.e. can sleep, which is disallowed since the fastpath handlers run with IRQs disabled. BUG: sleeping func...

Affected product and versions

Product
Linux
Affected versions
>= b439eb8ab578557263815ba8581d02c1b730e348 < cd3efb93677c4b0cf76348882fb429165fee33fd, >= b439eb8ab578557263815ba8581d02c1b730e348 < f994e9c790ce97d3cf01af4d0a1b9add0c955aee, >= b439eb8ab578557263815ba8581d02c1b730e348 < da2a3c231f7f2a5ac146d972b8c1d7d84aff6d70, >= b439eb8ab578557263815ba8581d02c1b730e348 < 0910dd7c9ad45a2605c45fd2bf3d1bcac087687c, >= 6.5
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:N/UI:N/S:C/C:N/I:N/A:H
CWE
Not available
CVE-2025-40038 — Linux | SECUFOCUS NOW