CVE-2020-7462 Use after free in FreeBSD
A use-after-free bug in the FreeBSD kernel allows attackers to cause a kernel panic via crafted IPv6 packets on the loopback interface.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-7462?
CVE-2020-7462 is a medium-severity use after free vulnerability in Freebsd Freebsd, published on 26 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In 11.4-PRERELEASE before r360733 and 11.3-RELEASE before p13, improper mbuf handling in the kernel causes a use-after-free bug by sending IPv6 Hop-by-Hop options over the loopback interface. The use-after-free situation may result in unintended kernel behaviour including a kernel panic.
Weakness: CWE-416
Which versions are affected by CVE-2020-7462?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2020-7462?
No fix has been published for CVE-2020-7462 yet. Limit exposure of the affected software until one is available.
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-2020-7462 being exploited?
There is no known exploitation of CVE-2020-7462 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-vfw2-5cx4-6c4q.