In the Linux kernel, the following vulnerability has been resolved: drm/i915: fix incorrect RCU teardown order i915_gem_busy_ioctl uses dma_resv_for_each_fence_unlocked() to iterate over the fences in an GEM object without holding a reference but only the RCU read side lock. What can happen here is that the GEM object is destroyed concurrently while i915_gem_busy_ioctl is still running. This won't free the GEM objects memory, but still drops all the dma_fence references. Now when dma_resv_for_each_fence_unlocked() sees a destroyed dma_fence it assumes that a new fence list was installed and re-starts the loop. But in the case of a destroyed GEM object a new fence list is never installed, only the old one freed and therefore the iteration never finishes resulting in an endless loop. The solution is to drop the fence references only after the RCU grace period. The fixes tag is not necessary the patch introducing the problem, but the one making it so worse that we need to address it. This problem was pointed out by Sashiko-bot. (cherry picked from commit 5113479556025093bf8133bb2dcaa33be2d50921)

A flaw was found in the Linux kernel's i915 graphics driver. When a graphics buffer object is concurrently destroyed while its busy status is being queried, an improper teardown sequence can cause the driver to restart its iteration indefinitely. A local attacker can exploit this race condition to trigger an infinite loop, resulting in a Denial of Service (DoS) and system hang.

This vulnerability is rated as Moderate impact because exploitation is constrained to authenticated local users with direct access to render or graphics device nodes, limiting the blast radius to a denial of service without compromising data confidentiality or system integrity. Exploitation requires a race condition during concurrent graphics buffer operations, which occurs only on systems actively utilizing Intel integrated GPU hardware. Headless server installations, virtual machines without PCI passthrough, and architectures using non-Intel graphics adapters do not load this driver and remain unaffected. Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Out of support scope kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt Red Hat OpenShift Container Platform 4 Not affected openshift/ose-rhel-coreos-8 Red Hat OpenShift Container Platform 4 Fix deferred openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 Fix deferred openshift/ose-rhel-coreos-9 https://www.cve.org/CVERecord?id=CVE-2026-98521 https://nvd.nist.gov/vuln/detail/CVE-2026-98521 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98521.mbox