staging: fbtft: make dirty_lock IRQ-safe
Summary
| CVE | CVE-2026-98094 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-25 11:17:39 UTC |
| Updated | 2026-10-19 10:18:06 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.001760000 probability, percentile 0.065280000 (date 2026-10-05)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected c296d5f9957c03994a699d6739c27d4581a9f6c7 0843298b159599ee7bc6d14800efdb4bc7349706 git | Not specified |
| CNA | Linux | Linux | affected c296d5f9957c03994a699d6739c27d4581a9f6c7 a323066337ed85c38decfc7f6bbf42f27605dff1 git | Not specified |
| CNA | Linux | Linux | affected c296d5f9957c03994a699d6739c27d4581a9f6c7 f2451e18826eb6a33ea51419f39bdd2eb99fa1ea git | Not specified |
| CNA | Linux | Linux | affected c296d5f9957c03994a699d6739c27d4581a9f6c7 10cc145b873670438d3b105133dffdae70822db6 git | Not specified |
| 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 5.10.271 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.222 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.189 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.158 6.6.* 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 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| 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/0843298b159599ee7bc6d14800efdb4bc7349706 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/10cc145b873670438d3b105133dffdae70822db6 | 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/f2451e18826eb6a33ea51419f39bdd2eb99fa1ea | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a323066337ed85c38decfc7f6bbf42f27605dff1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/dcb48fde8003492256dee45815144aa5ed26ce7c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.