NULL pointer dereference in Linux kernel - CVE-2021-38208
Published: May 18, 2022
Vulnerability identifier: #VU63383
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-38208
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the net/nfc/llcp_sock.c component. A remote attacker can make getsockname call and perform a denial of service (DoS) attack.
How to mitigate CVE-2021-38208
Install update from vendor's website.
Sources
- https://github.com/torvalds/linux/commit/4ac06a1e013cf5fdd963317ffd3b968560f33bba
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.10
- http://www.openwall.com/lists/oss-security/2021/08/17/1
- http://www.openwall.com/lists/oss-security/2021/08/17/2
- https://bugzilla.redhat.com/show_bug.cgi?id=1992810
- http://www.openwall.com/lists/oss-security/2021/08/24/2