CVE-2026-93183

Summary

In the Linux kernel, the following vulnerability has been resolved:

drm/lima: call drm_mm_init() with a valid allocation range

lima_vm_create() is currently run before va_start and va_end are set up, meaning they are both 0. lima_vm_create() runs drm_mm_init() with them as arguments for the allocator, and if DRM_DEBUG_MM is enabled the DRM_MM_BUG_ON check in drm_mm_init then fires, as seen here on exynos4412-odroid-u2:

[ 1.736297] ————[ cut here ]———— [ 1.740370] kernel BUG at drivers/gpu/drm/drm_mm.c:931! [ 1.745574] Internal error: Oops - BUG: 0 [#1] SMP ARM [ 1.750697] Modules linked in: [ 1.753734] CPU: 0 UID: 0 PID: 41 Comm: kworker/u16:1 Not tainted 7.0.10-postmarketos-exynos4 #11 PREEMPT [ 1.763372] Hardware name: Samsung Exynos (Flattened Device Tree) [ 1.769446] Workqueue: events_unbound deferred_probe_work_func [ 1.775261] PC is at drm_mm_init+0x9c/0xa4 [ 1.779339] LR is at lima_vm_create+0x144/0x17c [ … ]

Fix the issue by moving the lima_vm_create() call after va_start and va_end are set up.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/af1f276d50c9d7ebcd25770f358ca503a89d96d7
• https://git.kernel.org/stable/c/fd6bc5f1d6b54047b06b82bab25a7e21e4b1c95a
• https://git.kernel.org/stable/c/ad4e908096dff97646f77b04e2e2825225e215f7
• https://git.kernel.org/stable/c/788917ba77f5d69bd368c1d176ecceda346a2951
• https://git.kernel.org/stable/c/79a3331ee436c8b1454f897d539606c9b5ebdf9f
• https://git.kernel.org/stable/c/e2a7cee341986cb5b544a8286edc7fb0494c592e
• https://git.kernel.org/stable/c/e0773ad25a34a49aece176721c466cf214e02222
• https://git.kernel.org/stable/c/3b3bce4a692ac60d9f4a341e6b597dd1fd0a28f9

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