SB2026091994 - Improper locking in Linux kernel irqchip driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper locking (CVE-ID: CVE-2026-90123)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause a denial of service.

The vulnerability exists due to improper locking in the AST2700 interrupt-controller irq-domain activation callbacks when activating an irq domain while interrupts are disabled and a raw spinlock is held. A local privileged user can trigger the affected irq-domain activation path to cause a denial of service.

The affected compatibility checks can perform GFP_KERNEL memory allocations in an atomic context.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/b76eee9c2157223aa4aac42ceebb563288e078aa
• https://git.kernel.org/stable/c/f2f0da11648616e47419dca93610f6c0d70ec00b