linux: In the Linux kernel, the following vulnerability has been resolved: drm/prime: Fix use after free in mmap with drm_g...
CVE-2021-47200 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47200, released April 10, 2024. It is not reported as exploited. Patch Radar priority: High.
In the Linux kernel, the following vulnerability has been resolved: drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap drm_gem_ttm_mmap() drops a reference to the gem object on success. If the gem object's refcount == 1 on entry to drm_gem_prime_mmap(), that drop will free the gem object, and the subsequent drm_gem_object_get() will be a UAF. Fix by grabbing a reference before calling the mmap helper. This issue was forseen when the reference dropping was adding in commit 9786b65bc61ac ("drm/ttm: fix mmap refcounting"): "For that to work properly the drm_gem_object_get() call in drm_gem_ttm_mmap() must be moved so it happens before calling obj->funcs->mmap(), otherwise the gem refcount would go down to zero."
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 5.15.5-1 | DEBIAN-CVE-2021-47200 | Apr 10, 2024 |
| linux · Debian 13.5 (trixie) | 5.15.5-1 | DEBIAN-CVE-2021-47200 | Apr 10, 2024 |
| linux · Debian 14 | 5.15.5-1 | DEBIAN-CVE-2021-47200 | Apr 10, 2024 |
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