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CVE-2026-98094

staging: fbtft: make dirty_lock IRQ-safe

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In 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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From c296d5f9957c03994a699d6739c27d4581a9f6c7 · fixed in 0843298b159599ee7bc6d14800efdb4bc7349706; From c296d5f9957c03994a699d6739c27d4581a9f6c7 · fixed in a323066337ed85c38decfc7f6bbf42f27605dff1; From c296d5f9957c03994a699d6739c27d4581a9f6c7 · fixed in f2451e18826eb6a33ea51419f39bdd2eb99fa1ea; From c296d5f9957c03994a699d6739c27d4581a9f6c7 · fixed in 10cc145b873670438d3b105133dffdae70822db6; From c296d5f9957c03994a699d6739c27d4581a9f6c7 · fixed in 2a609e29efbba79f9abd68c4ec8a2bd7ecf291e7; From c296d5f9957c03994a699d6739c27d4581a9f6c7 · fixed in f0c869df2c33793c8828acaab3e4a5e0176f9f00; From c296d5f9957c03994a699d6739c27d4581a9f6c7 · fixed in dcb48fde8003492256dee45815144aa5ed26ce7c; From c296d5f9957c03994a699d6739c27d4581a9f6c7 · fixed in f576944a59f31bcffff121117ebf452c5dd162b7

  • Linux Linux

    4.0

  • KernelLinux

    From 4.0.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7

References 8

git.kernel.org