CVE-2020-9391 Memory corruption in n/a
A flaw in the Linux kernel's brk system call on AArch64 ignores the top address byte, causing heap corruption and potential code execution.
- 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-2020-9391?
CVE-2020-9391 is a medium-severity memory corruption vulnerability in Fedoraproject Fedora, published on 25 Feb 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on the AArch64 architecture. It ignores the top byte in the address passed to the brk system call, potentially moving the memory break downwards when the application expects it to move upwards, aka CID-dcde237319e6. This has been observed to cause heap corruption with the GNU C Library malloc implementation.
Weakness: CWE-787
Which versions are affected by CVE-2020-9391?
It affects 9 products.
Products include Fedoraproject Fedora, Linux kernel, Netapp Active Iq Unified Manager, Netapp Cloud Backup, Netapp Data Availability Services, Netapp H410c Firmware and 3 more.
How do I fix CVE-2020-9391?
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-2020-9391 being exploited?
There is no known exploitation of CVE-2020-9391 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as DEBIAN-CVE-2020-9391, GHSA-gpf5-7vrh-q24p, UBUNTU-CVE-2020-9391.