CVE-2024-43832 s390/uv: Don't call folio_wait_writeback() without a folio reference
A use-after-free vulnerability in the Linux kernel s390 UV subsystem allows attackers to cause denial of service or potentially execute code.
- 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-2024-43832?
CVE-2024-43832 is a high-severity use after free vulnerability in Linux kernel, published on 17 Aug 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:
s390/uv: Don't call folio_wait_writeback() without a folio reference
folio_wait_writeback() requires that no spinlocks are held and that a folio reference is held, as documented. After we dropped the PTL, the folio could get freed concurrently. So grab a temporary reference.
Which versions are affected by CVE-2024-43832?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-43832?
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-2024-43832 being exploited?
There is no known exploitation of CVE-2024-43832 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-43832, DEBIAN-CVE-2024-43832, GHSA-p87w-4hv9-gm3f, ROOT-OS-DEBIAN-11-CVE-2024-43832, ROOT-OS-UBUNTU-2204-CVE-2024-43832, UBUNTU-CVE-2024-43832.