CVE-2021-47534: drm/vc4: kms: Add missing drm_crtc_commit_put
First published: Fri May 24 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: kms: Add missing drm_crtc_commit_put Commit 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a commit") introduced a global state for the HVS, with each FIFO storing the current CRTC commit so that we can properly synchronize commits. However, the refcounting was off and we thus ended up leaking the drm_crtc_commit structure every commit. Add a drm_crtc_commit_put to prevent the leakage.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.12<5.15.7 | |
| Linux Kernel | =5.16-rc1 | |
| Linux Kernel | =5.16-rc2 | |
| Linux Kernel | =5.16-rc3 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-47534?
CVE-2021-47534 is classified as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2021-47534?
To resolve CVE-2021-47534, update your Linux kernel to a version that includes the fix, such as version 5.16 or later.
What systems are affected by CVE-2021-47534?
CVE-2021-47534 affects Linux kernel versions between 5.12 and 5.15.7, as well as specific 5.16 release candidates.
What type of vulnerability is CVE-2021-47534?
CVE-2021-47534 is a vulnerability related to the direct rendering manager in the Linux kernel.
Are there any workarounds for CVE-2021-47534?
There are no known effective workarounds for CVE-2021-47534; upgrading the kernel is the recommended approach.
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