CVE-2026-64245 fbdev: modedb: fix a possible UAF in fb_find_mode()
A use-after-free in the Linux kernel's fbdev modedb allows attackers to potentially execute code or escalate privileges via the fb_find_mode function.
- 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-2026-64245?
CVE-2026-64245 is a high-severity use after free vulnerability in Linux kernel, published on 24 Jul 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:
fbdev: modedb: fix a possible UAF in fb_find_mode()
If mode_option is NULL, it is assigned from mode_option_buf:
if (!mode_option) { fb_get_options(NULL, &mode_option_buf); mode_option = mode_option_buf; }
Later, name is assigned from mode_option:
const char *name = mode_option;
However, mode_option_buf is freed before name is no longer used:
kfree(mode_option_buf);
while name is still accessed by:
if ((name_matches(db[i], name, namelen) ||
Since name aliases mode_option_buf, this may result in a use-after-free.
Fix this by extending the lifetime of mode_option_buf until the end of the function by using scope-based resource management for cleanup.
Weakness: CWE-416
Which versions are affected by CVE-2026-64245?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64245?
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-2026-64245 being exploited?
There is no known exploitation of CVE-2026-64245 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64245, DEBIAN-CVE-2026-64245, GHSA-5hjc-xc74-xxjg, ROOT-OS-UBUNTU-2204-CVE-2026-64245, UBUNTU-CVE-2026-64245.