CVE-2026-99002 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security, especially those managing systems with untrusted users accessing the drm/vmwgfx component, should prioritize patching this vulnerability.

Why it matters

The Linux kernel's drm/vmwgfx component vulnerability could lead to information disclosure, denial of service, or privilege escalation if exploited.

• Potential out of bounds reads with cursor snooping could lead to information disclosure.
• Successful exploitation could result in denial of service.
• The vulnerability could be used to gain elevated privileges.

Technical summary

The Linux kernel's drm/vmwgfx component does not validate the pitch coming from userspace before copying data from the underlying surface, potentially leading to out of bounds reads with cursor snooping. The vulnerability is caused by a missing validation check for the pitch value, which is used to calculate the memory location for copying data. This oversight could lead to out-of-bounds reads, potentially resulting in information disclosure or system crashes. The Linux kernel maintainers have addressed this issue by adding the necessary validation checks.

Defensive priority

Defenders should prioritize patching this vulnerability, especially in systems where untrusted users have access to the Linux kernel's drm/vmwgfx component.

Recommended defensive actions

• Patch the Linux kernel to include the validation of pitch coming from userspace in the drm/vmwgfx component.
• Restrict access to the drm/vmwgfx component to trusted users only.
• Monitor systems for potential out of bounds reads with cursor snooping.
• Implement additional logging and monitoring to detect potential exploitation attempts.
• Conduct a thorough review of system configurations and user access controls to minimize the attack surface.
• Consider implementing compensating controls, such as intrusion detection systems, to detect and prevent exploitation.
• Keep track of system updates and patches to ensure timely mitigation of vulnerabilities.

Evidence notes

The CVE record and source item provide details about the vulnerability in the Linux kernel's drm/vmwgfx component. The NVD entry is currently not provided. The vulnerability was introduced due to a missing validation check for the pitch value, which is used to calculate the memory location for copying data. This oversight could lead to out-of-bounds reads, potentially resulting in information disclosure or system crashes. The Linux kernel maintainers have addressed this issue by adding the necessary validation checks.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.