CVE-2020-8428: Use After Free
fs/namei.c in the Linux kernel before 5.5 has a maycreateinsticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1 - Upgrade
Upgrade
Linux kernelto a version that resolves this vulnerability.Fixed in 5.5
Event History
Frequently Asked Questions
What is the severity of CVE-2020-8428?
CVE-2020-8428 is classified as a high severity vulnerability due to its potential to cause denial of service or leak sensitive information from kernel memory.
How do I fix CVE-2020-8428?
To fix CVE-2020-8428, update your Linux kernel to a version above 5.5, such as 5.10.223-1 or later.
Who is affected by CVE-2020-8428?
CVE-2020-8428 affects users running Linux kernel versions prior to 5.5, including certain distributions of Debian and Google Android.
What types of attacks can exploit CVE-2020-8428?
CVE-2020-8428 can be exploited via a local attack that may involve the misuse of the open system call for UNIX domain sockets.
What is the impact of CVE-2020-8428 on affected systems?
The impact of CVE-2020-8428 includes potential denial of service and exposure of sensitive information from kernel memory.