CVE-2023-53332 genirq/ipi: Fix NULL pointer deref in irq_data_get_affinity_mask()
A missing NULL pointer check in the Linux kernel's IPI handling allows a local attacker to trigger a kernel oops and cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53332?
CVE-2023-53332 is a medium-severity vulnerability in Linux kernel, published on 16 Sep 2025. 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:
genirq/ipi: Fix NULL pointer deref in irq_data_get_affinity_mask()
If ipi_send_{mask|single}() is called with an invalid interrupt number, all the local variables there will be NULL. ipi_send_verify() which is invoked from these functions does verify its 'data' parameter, resulting in a kernel oops in irq_data_get_affinity_mask() as the passed NULL pointer gets dereferenced.
Add a missing NULL pointer check in ipi_send_verify()...
Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool.
Weakness: CWE-476
Which versions are affected by CVE-2023-53332?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-53332?
Apply the vendor's patch.
Is CVE-2023-53332 being exploited?
There is no known exploitation of CVE-2023-53332 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-71888, BELL-CVE-2023-53332, DEBIAN-CVE-2023-53332, GHSA-4wpf-x7jv-xgqj, ROOT-OS-DEBIAN-11-CVE-2023-53332, ROOT-OS-UBUNTU-2204-CVE-2023-53332 and 1 more.