CVE-2026-98517

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

drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM

nouveau_uvmm_sm() calls op_map(), which passes bo->resource through

nouveau_mem() to nouveau_uvma_map(). nouveau_uvmm_vmm_map() then reads

mem->mem.type.

But this is only valid when bo->resource is backed by struct nouveau_mem,

as is the case for VRAM and TT resources. If the BO is left in

TTM_PL_SYSTEM, bo->resource is only a struct ttm_resource. Treating it

as struct nouveau_mem makes the mem->mem.type read past the end of the

resource, causing a KASAN: slab-use-after-free Read in nouveau_uvmm_sm

report:

BUG: KASAN: slab-use-after-free in nouveau_uvmm_vmm_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:152 [inline]

BUG: KASAN: slab-use-after-free in nouveau_uvma_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:199 [inline]

BUG: KASAN: slab-use-after-free in op_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:849 [inline]

BUG: KASAN: slab-use-after-free in nouveau_uvmm_sm.constprop.0+0x6ab/0x900 drivers/gpu/drm/nouveau/nouveau_uvmm.c:903

Read of size 1 at addr ffff888127d3e3a0 by task kworker/0:1/11

CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 7.2.0 #5 PREEMPT(lazy)

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014

Workqueue: nouveau_sched_wq_2224 drm_sched_run_job_work

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0x95/0xe0 lib/dump_stack.c:120

print_address_description mm/kasan/report.c:378 [inline]

print_report+0xcb/0x5a0 mm/kasan/report.c:482

kasan_report+0xca/0x100 mm/kasan/report.c:595

nouveau_uvmm_vmm_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:152 [inline]

nouveau_uvma_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:199 [inline]

op_map drivers/gpu/drm/nouveau/nouveau_uvmm.c:849 [inline]

nouveau_uvmm_sm.constprop.0+0x6ab/0x900 drivers/gpu/drm/nouveau/nouveau_uvmm.c:903

nouveau_uvmm_sm_unmap drivers/gpu/drm/nouveau/nouveau_uvmm.c:932 [inline]

nouveau_uvmm_bind_job_run+0xd6/0x250 drivers/gpu/drm/nouveau/nouveau_uvmm.c:1532

nouveau_job_run drivers/gpu/drm/nouveau/nouveau_sched.c:350 [inline]

nouveau_sched_run_job+0x62/0xd0 drivers/gpu/drm/nouveau/nouveau_sched.c:364

drm_sched_run_job_work+0x356/0xa10 drivers/gpu/drm/scheduler/sched_main.c:1061

process_one_work+0x8a5/0x1900 kernel/workqueue.c:3322

process_scheduled_works kernel/workqueue.c:3405 [inline]

worker_thread+0x5dd/0xd80 kernel/workqueue.c:3486

kthread+0x31d/0x420 kernel/kthread.c:436

ret_from_fork+0x662/0x940 arch/x86/kernel/process.c:158

ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

</TASK>

Allocated by task 2224 on cpu 0 at 66.550027s:

kasan_save_stack+0x24/0x50 mm/kasan/common.c:57

kasan_save_track+0x17/0x60 mm/kasan/common.c:78

poison_kmalloc_redzone mm/kasan/common.c:398 [inline]

__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415

kasan_kmalloc include/linux/kasan.h:263 [inline]

__do_kmalloc_node mm/slub.c:5334 [inline]

__kmalloc_noprof+0x304/0x7c0 mm/slub.c:5359

_kmalloc_noprof include/linux/slab.h:992 [inline]

dma_resv_list_alloc+0x27/0x90 drivers/dma-buf/dma-resv.c:106

dma_resv_reserve_fences+0x60e/0xa30 drivers/dma-buf/dma-resv.c:205

ttm_bo_alloc_resource+0x12c/0xbd0 drivers/gpu/drm/ttm/ttm_bo.c:721

ttm_bo_validate+0x1bc/0x4a0 drivers/gpu/drm/ttm/ttm_bo.c:856

ttm_bo_init_reserved+0x2c3/0x570 drivers/gpu/drm/ttm/ttm_bo.c:970

nouveau_bo_init+0x159/0x2c0 drivers/gpu/drm/nouveau/nouveau_bo.c:359

nouveau_gem_new+0x234/0x5f0 drivers/gpu/drm/nouveau/nouveau_gem.c:272

nouveau_gem_ioctl_new+0x1eb/0x420 drivers/gpu/drm/nouveau/nouveau_gem.c:352

drm_ioctl_kernel+0x192/0x350 drivers/gpu/drm/drm_ioctl.c:817

drm_ioctl+0x4f8/0xb40 drivers/gpu/drm/drm_ioctl.c:914

nouveau_drm_ioctl+0xea/0x2c0 drivers/gpu/drm/nouveau/nouveau_drm.c:1338

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:597 [inline]

__se_sys_ioctl fs/ioctl.c:583 [inline]

__x64_sys_ioctl+0x180/0x1d0 fs/ioctl.c:583

do_syscall_x64 ar

---truncated---