CVE-2022-43945 Memory corruption in linux kernel
A remote attacker can cause a buffer overflow in the Linux kernel NFSD module, leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-43945?
CVE-2022-43945 is a high-severity memory corruption vulnerability in Linux kernel, published on 4 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Linux kernel NFSD implementation prior to versions 5.19.17 and 6.0.2 are vulnerable to buffer overflow. NFSD tracks the number of pages held by each NFSD thread by combining the receive and send buffers of a remote procedure call (RPC) into a single array of pages. A client can force the send buffer to shrink by sending an RPC message over TCP with garbage data added at the end of the message. The RPC message with garbage data is still correctly formed according to the specification and is passed forward to handlers. Vulnerable code in NFSD is not expecting the oversized request and writes beyond the allocated buffer space. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Which versions are affected by CVE-2022-43945?
It affects 7 products.
Products include Linux kernel, Netapp Active Iq Unified Manager, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500s Firmware and 1 more.
How do I fix CVE-2022-43945?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2022-43945 being exploited?
There is no known exploitation of CVE-2022-43945 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-11379, DEBIAN-CVE-2022-43945, GHSA-42x7-fjc5-38vr, UBUNTU-CVE-2022-43945.