NULL pointer dereference in Linux kernel - CVE-2021-3739
Published: June 1, 2024
Vulnerability identifier: #VU90666
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-3739
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to read data or crash the application.
The vulnerability exists due to NULL pointer dereference within the btrfs_rm_device() function in fs/btrfs/volumes.c. A local user can read data or crash the application.
How to mitigate CVE-2021-3739
Install update from vendor's website.
Sources
- https://ubuntu.com/security/CVE-2021-3739
- https://www.openwall.com/lists/oss-security/2021/08/25/3
- https://bugzilla.redhat.com/show_bug.cgi?id=1997958
- https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091
- https://security.netapp.com/advisory/ntap-20220407-0006/