Medium [CVE-2026-68233] Shut down BO cache timer before teardown
This medium-severity Red Hat Linux advisory covers CVE-2026-68233 affecting Red Hat Enterprise Linux for NVIDIA 26, Red Hat OpenShift Container Platform 4, Red Hat package: kernel.
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Summary
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Shut down BO cache timer before teardown The BO cache timer callback schedules time_work, and time_work can rearm the timer through vc4_bo_cache_free_old(). vc4_bo_cache_destroy() deletes the timer and then cancels the work, which does not break that cycle: the work being cancelled can rearm the timer, and the timer then queues work again after teardown.
Use timer_shutdown_sync() instead, so the timer cannot be rearmed and the cycle ends with cancel_work_sync(). A logic error in the BO cache timer shutdown process allows the timer to be rearmed even after it has been destroyed.
This can lead to work being queued again after teardown, potentially causing system instability or a denial of service (DoS) due to improper resource management. This issue affects Raspberry Pi vc4 DRM.
Systems without vc4 are not affected. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-821. Affected Red Hat products: Red Hat Enterprise Linux for NVIDIA 26; Red Hat OpenShift Container Platform 4.
Will not fix / out of support: Red Hat Enterprise Linux for NVIDIA 26. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
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