CVE-2026-93215 cdx: Fix double free when sysfs file creation fails
A double free vulnerability in the Linux kernel CDX bus driver allows local attackers to cause a denial of service or potentially execute arbitrary code.
- 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-2026-93215?
CVE-2026-93215 is an use after free vulnerability in Linux, published on 24 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:
cdx: Fix double free when sysfs file creation fails
In cdx_create_res_attr(), if sysfs_create_bin_file() fails, the code frees res_attr but doesn't set cdx_dev->res_attr[num] to NULL. This leaves a dangling pointer in the array. Then cdx_destroy_res_attr() frees the already-freed memory. Fix the double free by initializing cdx_dev->res_attr[num] after sysfs_create_bin_file() completes.
Which versions are affected by CVE-2026-93215?
How do I fix CVE-2026-93215?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-93215 being exploited?
There is no known exploitation of CVE-2026-93215 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93215, DEBIAN-CVE-2026-93215, GHSA-hvg6-3p54-385v, UBUNTU-CVE-2026-93215.