CVE-2021-3739

Public Exploit

Description

A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.

Category

7.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.02%
Vendor Advisory kernel.org
Affected: n/a kernel
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1997958 issue tracking third party advisory patch
https://ubuntu.com/security/CVE-2021-3739 third party advisory
https://www.openwall.com/lists/oss-security/2021/08/25/3 mailing list third party advisory patch
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091 mailing list patch vendor advisory
https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091 exploit third party advisory patch
https://security.netapp.com/advisory/ntap-20220407-0006/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-3739?
CVE-2021-3739 has been scored as a high severity vulnerability.
How to fix CVE-2021-3739?
To fix CVE-2021-3739, 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-2021-3739 being actively exploited in the wild?
It is possible that CVE-2021-3739 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-3739?
CVE-2021-3739 affects n/a kernel.
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