drm/msm: don't tear down KMS twice when KMS init fails

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Summary

CVECVE-2026-90363
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:35 UTC
Updated2026-09-17 17:17:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/msm: don't tear down KMS twice when KMS init fails When priv->kms_init() (mdp4_kms_init() / mdp5_kms_init()) fails partway through, both display drivers already tear their KMS state down via mdp4_destroy() / mdp5_kms_destroy() before returning the error. The common error path in msm_drm_init() then runs msm_drm_uninit() -> msm_drm_kms_uninit(), which tries to destroy the very same KMS a second time, which causes a use-after-free crash. Bring MDP4/MDP5 in line with the DPU driver whose dpu_kms_init() doesn't perform error cleanup on the failure. Let the common path own the cleanup, instead of freeing the KMS from their error paths. The crash trace for the reference: __lock_acquire from lock_acquire (kernel/locking/lockdep.c:5906 kernel/locking/lockdep.c:5863) lock_acquire from touch_wq_lockdep_map (kernel/workqueue.c:4094 (discriminator 1)) touch_wq_lockdep_map from __flush_workqueue (kernel/workqueue.c:4136) __flush_workqueue from msm_drm_kms_uninit (drivers/gpu/drm/msm/msm_kms.c:243 (discriminator 33)) msm_drm_kms_uninit from msm_drm_uninit (drivers/gpu/drm/msm/msm_drv.c:93) msm_drm_uninit from msm_drm_init (drivers/gpu/drm/msm/msm_drv.c:184) msm_drm_init from try_to_bring_up_aggregate_device (drivers/base/component.c:249 drivers/base/component.c:227) try_to_bring_up_aggregate_device from __component_add (drivers/base/component.c:269 drivers/base/component.c:748) __component_add from dsi_host_attach (drivers/gpu/drm/msm/dsi/dsi_host.c:1739) dsi_host_attach from mipi_dsi_attach (drivers/gpu/drm/drm_mipi_dsi.c:383) mipi_dsi_attach from sharp_nt_panel_probe (drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c:247) Patchwork: https://patchwork.freedesktop.org/patch/742068/

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 506efcba31296e9cbc4f8f148eec1e4b29039931 08827aa40f0ee9d37dcff8d6acb340b970051486 git Not specified
CNA Linux Linux affected 506efcba31296e9cbc4f8f148eec1e4b29039931 e2a99fa93b400dfbb9598103249f71969501094a git Not specified
CNA Linux Linux affected 506efcba31296e9cbc4f8f148eec1e4b29039931 93c125e4ea98fb25f927ba5a334d85845127d667 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/93c125e4ea98fb25f927ba5a334d85845127d667 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/08827aa40f0ee9d37dcff8d6acb340b970051486 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e2a99fa93b400dfbb9598103249f71969501094a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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