CVE-2025-21911: drm/imagination: avoid deadlock on fence release
First published: Tue Apr 01 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/imagination: avoid deadlock on fence release Do scheduler queue fence release processing on a workqueue, rather than in the release function itself. Fixes deadlock issues such as the following: [ 607.400437] ============================================ [ 607.405755] WARNING: possible recursive locking detected [ 607.415500] -------------------------------------------- [ 607.420817] weston:zfq0/24149 is trying to acquire lock: [ 607.426131] ffff000017d041a0 (reservation_ww_class_mutex){+.+.}-{3:3}, at: pvr_gem_object_vunmap+0x40/0xc0 [powervr] [ 607.436728] but task is already holding lock: [ 607.442554] ffff000017d105a0 (reservation_ww_class_mutex){+.+.}-{3:3}, at: dma_buf_ioctl+0x250/0x554 [ 607.451727] other info that might help us debug this: [ 607.458245] Possible unsafe locking scenario: [ 607.464155] CPU0 [ 607.466601] ---- [ 607.469044] lock(reservation_ww_class_mutex); [ 607.473584] lock(reservation_ww_class_mutex); [ 607.478114] *** DEADLOCK ***
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=6.8<6.12.19 | |
| Linux Kernel | >=6.13<6.13.7 | |
| Linux Kernel | =6.14-rc1 | |
| Linux Kernel | =6.14-rc2 | |
| Linux Kernel | =6.14-rc3 | |
| Linux Kernel | =6.14-rc4 | |
| Linux Kernel | =6.14-rc5 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-21911?
CVE-2025-21911 is classified as a medium severity vulnerability.
How do I fix CVE-2025-21911?
To fix CVE-2025-21911, upgrade to the latest version of the Linux kernel that has addressed this vulnerability.
What does CVE-2025-21911 affect?
CVE-2025-21911 affects the Linux kernel, specifically related to the drm/imagination module.
What type of vulnerability is CVE-2025-21911?
CVE-2025-21911 is a deadlock vulnerability that occurs during the fence release process.
Is there a workaround for CVE-2025-21911?
There is no documented workaround for CVE-2025-21911; the recommended solution is to apply the kernel patch.
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