CVE-2025-40277

Guest privilege escalation via unchecked command size

Published Dec 6, 2025 · Updated Aug 5, 2026

Integer overflow in Linux 4.3 and later affected kernels allows local users to access kernel memory via crafted SVGA3D commands. The vmw_cmd_check function accepts an oversized userspace SVGA3dCmdHeader.size and uses it in buffer-offset arithmetic without enforcing SVGA_CMD_MAX_DATASIZE. Access to the vmwgfx device inside a VMware guest is required; resulting out-of-bounds kernel access can crash the guest or support privilege escalation.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux 4.3 and later affected kernels allows local users to access kernel memory via crafted SVGA3D commands. The vmw_cmd_check function accepts an oversized userspace SVGA3dCmdHeader.size and uses it in buffer-offset arithmetic without enforcing SVGA_CMD_MAX_DATASIZE. Access to the vmwgfx device inside a VMware guest is required; resulting out-of-bounds kernel access can crash the guest or support privilege escalation.

The record

CVE
CVE-2025-40277
Published
Dec 6, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.3
  2. Affected versionversion=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <32b415a9dc2c212e809b7ebc2b14bc3fbda2b9af
  3. Affected versionversion=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <54d458b244893e47bda52ec3943fdfbc8d7d068b
  4. Affected versionversion=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <5aea2cde03d4247cdcf53f9ab7d0747c9dca1cfc
  5. Affected versionversion=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <709e5c088f9c99a5cf2c1d1c6ce58f2cca7ab173
  6. Affected versionversion=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <a3abb54c27b2c393c44362399777ad2f6e1ff17e
  7. Affected versionversion=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <b5df9e06eed3df6a4f5c6f8453013b0cabb927b4
  8. Affected versionversion=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <e58559845021c3bad5e094219378b869157fad53
  9. Affected versionversion=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <f3f3a8eb3f0ba799fae057091d8c67cca12d6fa0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.3; version=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <32b415a9dc2c212e809b7ebc2b14bc3fbda2b9af; version=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <54d458b244893e47bda52ec3943fdfbc8d7d068b; version=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <5aea2cde03d4247cdcf53f9ab7d0747c9dca1cfc; version=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <709e5c088f9c99a5cf2c1d1c6ce58f2cca7ab173; version=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <a3abb54c27b2c393c44362399777ad2f6e1ff17e; version=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <b5df9e06eed3df6a4f5c6f8453013b0cabb927b4; version=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <e58559845021c3bad5e094219378b869157fad53; version=8ce75f8ab9044fe11caaaf2b2c82471023212f9f <f3f3a8eb3f0ba799fae057091d8c67cca12d6fa0

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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