drm: Fix use-after-free on framebuffers and property blobs when calling drm_dev_unplug

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Summary

CVECVE-2026-23471
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-03 16:16:34 UTC
Updated2026-04-03 16:16:34 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free on framebuffers and property blobs when calling drm_dev_unplug When trying to do a rather aggressive test of igt's "xe_module_load --r reload" with a full desktop environment and game running I noticed a few OOPSes when dereferencing freed pointers, related to framebuffers and property blobs after the compositor exits. Solve this by guarding the freeing in drm_file with drm_dev_enter/exit, and immediately put the references from struct drm_file objects during drm_dev_unplug(). Related warnings for framebuffers on the subtest: [ 739.713076] ------------[ cut here ]------------ WARN_ON(!list_empty(&dev->mode_config.fb_list)) [ 739.713079] WARNING: drivers/gpu/drm/drm_mode_config.c:584 at drm_mode_config_cleanup+0x30b/0x320 [drm], CPU#12: xe_module_load/13145 .... [ 739.713328] Call Trace: [ 739.713330] <TASK> [ 739.713335] ? intel_pmdemand_destroy_state+0x11/0x20 [xe] [ 739.713574] ? intel_atomic_global_obj_cleanup+0xe4/0x1a0 [xe] [ 739.713794] intel_display_driver_remove_noirq+0x51/0xb0 [xe] [ 739.714041] xe_display_fini_early+0x33/0x50 [xe] [ 739.714284] devm_action_release+0xf/0x20 [ 739.714294] devres_release_all+0xad/0xf0 [ 739.714301] device_unbind_cleanup+0x12/0xa0 [ 739.714305] device_release_driver_internal+0x1b7/0x210 [ 739.714311] device_driver_detach+0x14/0x20 [ 739.714315] unbind_store+0xa6/0xb0 [ 739.714319] drv_attr_store+0x21/0x30 [ 739.714322] sysfs_kf_write+0x48/0x60 [ 739.714328] kernfs_fop_write_iter+0x16b/0x240 [ 739.714333] vfs_write+0x266/0x520 [ 739.714341] ksys_write+0x72/0xe0 [ 739.714345] __x64_sys_write+0x19/0x20 [ 739.714347] x64_sys_call+0xa15/0xa30 [ 739.714355] do_syscall_64+0xd8/0xab0 [ 739.714361] entry_SYSCALL_64_after_hwframe+0x4b/0x53 and [ 739.714459] ------------[ cut here ]------------ [ 739.714461] xe 0000:67:00.0: [drm] drm_WARN_ON(!list_empty(&fb->filp_head)) [ 739.714464] WARNING: drivers/gpu/drm/drm_framebuffer.c:833 at drm_framebuffer_free+0x6c/0x90 [drm], CPU#12: xe_module_load/13145 [ 739.714715] RIP: 0010:drm_framebuffer_free+0x7a/0x90 [drm] ... [ 739.714869] Call Trace: [ 739.714871] <TASK> [ 739.714876] drm_mode_config_cleanup+0x26a/0x320 [drm] [ 739.714998] ? __drm_printfn_seq_file+0x20/0x20 [drm] [ 739.715115] ? drm_mode_config_cleanup+0x207/0x320 [drm] [ 739.715235] intel_display_driver_remove_noirq+0x51/0xb0 [xe] [ 739.715576] xe_display_fini_early+0x33/0x50 [xe] [ 739.715821] devm_action_release+0xf/0x20 [ 739.715828] devres_release_all+0xad/0xf0 [ 739.715843] device_unbind_cleanup+0x12/0xa0 [ 739.715850] device_release_driver_internal+0x1b7/0x210 [ 739.715856] device_driver_detach+0x14/0x20 [ 739.715860] unbind_store+0xa6/0xb0 [ 739.715865] drv_attr_store+0x21/0x30 [ 739.715868] sysfs_kf_write+0x48/0x60 [ 739.715873] kernfs_fop_write_iter+0x16b/0x240 [ 739.715878] vfs_write+0x266/0x520 [ 739.715886] ksys_write+0x72/0xe0 [ 739.715890] __x64_sys_write+0x19/0x20 [ 739.715893] x64_sys_call+0xa15/0xa30 [ 739.715900] do_syscall_64+0xd8/0xab0 [ 739.715905] entry_SYSCALL_64_after_hwframe+0x4b/0x53 and then finally file close blows up: [ 743.186530] Oops: general protection fault, probably for non-canonical address 0xdead000000000122: 0000 [#1] SMP [ 743.186535] CPU: 3 UID: 1000 PID: 3453 Comm: kwin_wayland Tainted: G W 7.0.0-rc1-valkyria+ #110 PREEMPT_{RT,(lazy)} [ 743.186537] Tainted: [W]=WARN [ 743.186538] Hardware name: Gigabyte Technology Co., Ltd. X299 AORUS Gaming 3/X299 AORUS Gaming 3-CF, BIOS F8n 12/06/2021 [ 743.186539] RIP: 0010:drm_framebuffer_cleanup+0x55/0xc0 [drm] [ 743.186588] Code: d8 72 73 0f b6 42 05 ff c3 39 c3 72 e8 49 8d bd 50 07 00 00 31 f6 e8 3a 80 d3 e1 49 8b 44 24 10 49 8d 7c 24 08 49 8b 54 24 08 <48> 3b 38 0f 85 95 7f 02 00 48 3b 7a 08 0f 85 8b 7f 02 00 48 89 42 [ 743.186589] RSP: 0018:ffffc900085e3cf8 EFLAGS: 00 ---truncated---

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 54df178324b268c62f847381e2813a1b0f971384 git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 eec4d5758f33925e0bdb4a32b45d86a68afa4516 git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 7e3ec3bf4015156dcc5bafed13f26a587cc37f5c git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 074d06d3724ccab0c5bb779db594a82b6405e501 git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 e493c135980f90c20308d1a98f2e0d1223951e94 git Not specified
CNA Linux Linux affected bee330f3d67273a68dcb99f59480d59553c008b2 6bee098b91417654703e17eb5c1822c6dfd0c01d git Not specified
CNA Linux Linux affected 4.18 Not specified
CNA Linux Linux unaffected 4.18 semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6bee098b91417654703e17eb5c1822c6dfd0c01d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eec4d5758f33925e0bdb4a32b45d86a68afa4516 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/074d06d3724ccab0c5bb779db594a82b6405e501 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/54df178324b268c62f847381e2813a1b0f971384 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e3ec3bf4015156dcc5bafed13f26a587cc37f5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e493c135980f90c20308d1a98f2e0d1223951e94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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