CVE-2024-26705 parisc: BTLB: Fix crash when setting up BTLB at CPU bringup
A kernel crash occurs during CPU bringup on 32-bit PA-RISC systems due to write protection on static TLB data, causing 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-2024-26705?
CVE-2024-26705 is a medium-severity vulnerability in Linux kernel, published on 3 Apr 2024. 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:
parisc: BTLB: Fix crash when setting up BTLB at CPU bringup
When using hotplug and bringing up a 32-bit CPU, ask the firmware about the BTLB information to set up the static (block) TLB entries.
For that write access to the static btlb_info struct is needed, but since it is marked __ro_after_init the kernel segfaults with missing write permissions.
Fix the crash by dropping the __ro_after_init annotation.
Weakness: CWE-862
Which versions are affected by CVE-2024-26705?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-26705?
Apply the vendor's patch.
Is CVE-2024-26705 being exploited?
There is no known exploitation of CVE-2024-26705 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-26705, DEBIAN-CVE-2024-26705, GHSA-xv6f-4q9w-8q96, UBUNTU-CVE-2024-26705.