CVE-2026-90123 irqchip/ast2700-intc: Avoid allocating in the irq_domain activate() callback
A kernel bug in the AST2700 interrupt controller causes a crash when allocating memory with interrupts disabled, leading to local denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90123?
CVE-2026-90123 is a denial of service vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
irqchip/ast2700-intc: Avoid allocating in the irq_domain activate() callback
The interrupt core calls the irq_domain_activate() callback from __setup_irq() with desc->lock held and interrupts disabled. Both aspeed_intc1_irq_domain_activate() and aspeed_intc0_resolve_route() test a compatible string with fwnode_device_is_compatible().
fwnode_device_is_compatible() invokes fwnode_property_match_string(), which allocates with GFP_KERNEL. That's obviously not possible with interrupts disabled and a raw spinlock held.
Both call sites are only ever handed OF nodes, so use of_device_is_compatible() instead: it walks the property in place and does not allocate.
Which versions are affected by CVE-2026-90123?
How do I fix CVE-2026-90123?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-90123 being exploited?
There is no known exploitation of CVE-2026-90123 in the wild and no public exploit code.
Sources
Also known as GHSA-j4hm-9pmg-gfwx, UBUNTU-CVE-2026-90123.