CVE-2026-68445: drm/vc4: Prevent shader BO mappings from becoming writable

mediumCVSS 5.5CVE-2026-68445

CSIRTS triage

vendor: Linux product: Linux Kernel Privilege escalation

What: The drm/vc4 driver fails to prevent shader buffer object mappings from becoming writable, allowing privilege escalation through memory mapping bypass.
Who is affected: Systems running Linux kernel with vc4 DRM driver enabled.
Urgency: Medium priority; not currently exploited but memory mapping bypass is a common privilege escalation vector.
Action: Apply Linux kernel patch addressing CVE-2026-68445 to prevent writable shader BO mappings.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Linux Kernel

Get an email when a new Linux Kernel advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68445

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-684450.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68445	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for drm/vc4

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-74454: In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Supply the overfl…nvd · 2026-08-15
highCVE-2026-74453: In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Zero the tile sta…nvd · 2026-08-15
highCVE-2026-68445: In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Prevent shader BO…nvd · 2026-08-12
mediumCVE-2026-68233: drm/vc4: Shut down BO cache timer before teardownmsrc · 2026-08-11
mediumCVE-2026-68303: drm/vc4: hvs/v3d: Fix null dereference in unbindmsrc · 2026-08-11
mediumCVE-2026-74453: drm/vc4: Zero the tile state data array before each BIN jobmsrc · 2026-08-11