CVE-2026-68241 drm/i915/mst: limit DP MST ESI service loop
An unbounded loop in the Intel i915 DP MST driver allows a malicious sink device to cause a denial of service by keeping the kernel busy servicing interrupts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68241?
CVE-2026-68241 is a denial of service vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drm/i915/mst: limit DP MST ESI service loop
The loop in intel_dp_check_mst_status() keeps servicing interrupts originating from the sink without bound. Add an upper bound to the new interrupts occurring during interrupt processing to not get stuck on potentially stuck sink devices. Use arbitrary 32 tries to clear incoming interrupts in one go.
Discovered using AI-assisted static analysis confirmed by Intel Product Security.
Note: The condition likely pre-dates the commit in the Fixes: tag, but this is about as far back as a backport has any chance of succeeding. Before that, the retry had a goto.
(cherry picked from commit b4ea5272133059acb493cc36599071a9e852ec2e)
Which versions are affected by CVE-2026-68241?
How do I fix CVE-2026-68241?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-68241 being exploited?
There is no known exploitation of CVE-2026-68241 in the wild and no public exploit code.
Sources
Also known as AZL-94938, BELL-CVE-2026-68241, DEBIAN-CVE-2026-68241, GHSA-334r-pfv9-rpmj, UBUNTU-CVE-2026-68241.