NULL pointer dereference in Linux kernel - CVE-2026-89993
Published: September 16, 2026
Vulnerability identifier: #VU150294
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89993
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a null pointer dereference.
The vulnerability exists due to improper initialization of IRQ data in dw_edma_irq_request() when a shared interrupt is handled before dw_edma_channel_setup() initializes the back pointer. A local user can trigger a shared interrupt during initialization to trigger a null pointer dereference.
Affected software
Linux kernel
How to mitigate CVE-2026-89993
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/07e50cef557def076418c67051a336e4c6bd50e1
- https://git.kernel.org/stable/c/17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba
- https://git.kernel.org/stable/c/647217abea849d3d45f8cb0b8ee5b78d50f26985
- https://git.kernel.org/stable/c/b86280b12ccf33b68b309b7cb0e4476894dfe77c
- https://git.kernel.org/stable/c/d232bc6cf4562132ef50644484dfd4b23a593295
- https://git.kernel.org/stable/c/d91fb6c0d10dad32929dc5c6850f89df34e1bfcd
- https://git.kernel.org/stable/c/fac202d73e7a649b7d4010325c6c6dcd9334fe65