staging: fbtft: make dirty_lock IRQ-safe

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98094
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:39 UTC
Updated2026-09-25 11:17:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: staging: fbtft: make dirty_lock IRQ-safe fbtft_mkdirty() can be reached from the fbcon rendering path while processing printk() in hardirq context. Meanwhile, dirty_lock is also taken by fbtft_deferred_io() in workqueue context with local interrupts enabled. Lockdep reports a possible IRQ lock inversion involving dirty_lock and console_owner. A hardirq can interrupt a CPU holding dirty_lock and enter the console rendering path, which can attempt to acquire dirty_lock again. The following lockdep report was observed on an RK3566 system with CONFIG_PROVE_LOCKING enabled: WARNING: possible irq lock inversion dependency detected swapper/2/0 just changed the state of lock: (console_owner){-...}-{0:0} but this lock took another, HARDIRQ-unsafe lock in the past: (&par->dirty_lock){+.+.}-{2:2} CPU0 CPU1 ---- ---- lock(&par->dirty_lock); local_irq_disable(); lock(console_owner); lock(&par->dirty_lock); <Interrupt> lock(console_owner); *** DEADLOCK *** Use spin_lock_irqsave() for fbtft_mkdirty() and spin_lock_irq() for fbtft_deferred_io(). They only access the dirty line range, so the IRQ-off regions remain short.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c296d5f9957c03994a699d6739c27d4581a9f6c7 2a609e29efbba79f9abd68c4ec8a2bd7ecf291e7 git Not specified
CNA Linux Linux affected c296d5f9957c03994a699d6739c27d4581a9f6c7 f0c869df2c33793c8828acaab3e4a5e0176f9f00 git Not specified
CNA Linux Linux affected c296d5f9957c03994a699d6739c27d4581a9f6c7 dcb48fde8003492256dee45815144aa5ed26ce7c git Not specified
CNA Linux Linux affected c296d5f9957c03994a699d6739c27d4581a9f6c7 f576944a59f31bcffff121117ebf452c5dd162b7 git Not specified
CNA Linux Linux affected 4.0 Not specified
CNA Linux Linux unaffected 4.0 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2a609e29efbba79f9abd68c4ec8a2bd7ecf291e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0c869df2c33793c8828acaab3e4a5e0176f9f00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f576944a59f31bcffff121117ebf452c5dd162b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dcb48fde8003492256dee45815144aa5ed26ce7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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