CVE-2021-3347: Use After Free
A flaw was found in the Linux kernel. A use after free issue in PI futex may lead to code execution.
Upstream patch:
https://github.com/torvalds/linux/commit/c64396cc36c6e60704ab06c1fb1c4a46179c9120
References:
https://www.openwall.com/lists/oss-security/2021/01/29/1
Other sources
A flaw was found in the Linux kernel. A use-after-free memory flaw in the Fast Userspace Mutexes functionality allowing a local user to crash the system or escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.
Linux Kernel could allow a local authenticated attacker to gain elevated privileges on the system, caused by a kernel stack use-after-free during fault handling in PI futexes. An attacker could exploit this vulnerability to gain elevated privileges and execute arbitrary code in the kernel.
— IBM
Affected Software
Remediation
Event History
Parent advisories
This vulnerability appears in the following advisories.
Frequently Asked Questions
What is the severity of CVE-2021-3347?
CVE-2021-3347 has a high severity level due to the potential for code execution through a use after free vulnerability.
How do I fix CVE-2021-3347?
To fix CVE-2021-3347, apply the latest kernel patches and updates provided by your distribution.
Which Linux versions are affected by CVE-2021-3347?
CVE-2021-3347 affects multiple versions of the Linux kernel, particularly those prior to the patched versions listed by Red Hat and other distributions.
What are the potential impacts of CVE-2021-3347?
The potential impacts of CVE-2021-3347 include arbitrary code execution, which could lead to system compromise or unauthorized access.
Is there an exploit available for CVE-2021-3347?
At the time of reporting, there was potential for exploitation, but specific exploit details require careful management to prevent misuse.