CVE-2021-26708: Race Condition
A flaw was found in the Linux kernel. Wrong locking in the AFVSOCK socket can cause a local privilege escalation, bypassing SMEP and SMAP. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Other sources
A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AFVSOCK implementation are caused by wrong locking in net/vmwvsock/afvsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.
A vulnerability was found in Linux Kernel, where race conditions caused by wrong locking in net/vmwvsock/afvsock.c
Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446
— Red Hat
Affected Software
Remediation
Patch Available
Patch Available
Patch Available
Event History
Parent advisories
This vulnerability appears in the following advisories.
Frequently Asked Questions
What is the severity of CVE-2021-26708?
The severity of CVE-2021-26708 is high with a severity value of 7.
How does CVE-2021-26708 affect the Linux kernel?
CVE-2021-26708 is a local privilege escalation vulnerability that affects the Linux kernel before version 5.10.13.
What is the impact of CVE-2021-26708?
CVE-2021-26708 can be exploited by an attacker with local access to escalate their privileges on a vulnerable system.
How can I fix CVE-2021-26708?
Apply the latest security patches or upgrade to a version of the Linux kernel that is not affected by CVE-2021-26708.
Where can I find more information about CVE-2021-26708?
Additional information about CVE-2021-26708 can be found in the references provided: [Reference 1](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446), [Reference 2](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1925595), [Reference 3](https://www.openwall.com/lists/oss-security/2021/02/04/5).