Bug 2454836 (CVE-2026-23470)

Summary: CVE-2026-23470 kernel: drm/imagination: Fix deadlock in soft reset sequence
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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A flaw was found in the Linux kernel's `drm/imagination` driver. A local attacker could potentially trigger a deadlock condition during the soft reset sequence. This occurs because the soft reset sequence, when executed from a threaded Interrupt Request (IRQ) handler, attempts to disable IRQs while waiting for itself to complete. This can lead to a system hang or unresponsiveness, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-04-03 16:03:26 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/imagination: Fix deadlock in soft reset sequence

The soft reset sequence is currently executed from the threaded IRQ
handler, hence it cannot call disable_irq() which internally waits
for IRQ handlers, i.e. itself, to complete.

Use disable_irq_nosync() during a soft reset instead.
Comment 1 Jon Moroney 2026-04-03 18:22:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040322-CVE-2026-23470-a491@gregkh/T