CVE-2011-4080

Description

The sysrq_sysctl_handler function in kernel/sysctl.c in the Linux kernel before 2.6.39 does not require the CAP_SYS_ADMIN capability to modify the dmesg_restrict value, which allows local users to bypass intended access restrictions and read the kernel ring buffer by leveraging root privileges, as demonstrated by a root user in a Linux Containers (aka LXC) environment.

Category

4.0
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.07%
Third-Party Advisory openwall.com Third-Party Advisory github.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/torvalds/linux/commit/bfdc0b497faa82a0ba2f9dddcf109231dd519fcc third party advisory patch
http://www.openwall.com/lists/oss-security/2011/10/26/10 third party advisory mailing list
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39 broken link
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=bfdc0b497faa82a0ba2f9dddcf109231dd519fcc

Frequently Asked Questions

What is the severity of CVE-2011-4080?
CVE-2011-4080 has been scored as a medium severity vulnerability.
How to fix CVE-2011-4080?
To fix CVE-2011-4080, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2011-4080 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2011-4080 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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