Out-of-bounds read in Linux kernel - CVE-2021-38202
Published: August 8, 2021 / Updated: October 7, 2021
Vulnerability identifier: #VU92754
CSH Severity: Low
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-38202
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
fs/nfsd/trace.h in the Linux kernel before 5.13.4 might allow remote attackers to cause a denial of service (out-of-bounds read in strlen) by sending NFS traffic when the trace event framework is being used for nfsd.
Affected software
Linux kernel
Ubuntu
linux-image-5.13.0-1014-oem (Ubuntu package)
linux-image-oem-20.04c (Ubuntu package)
Ubuntu
linux-image-5.13.0-1014-oem (Ubuntu package)
linux-image-oem-20.04c (Ubuntu package)
How to mitigate CVE-2021-38202
Install update from vendor's repository.
linux-image-5.13.0-1014-oem (Ubuntu package) - update to 5.13.0-1014.18
linux-image-oem-20.04c (Ubuntu package) - update to 5.13.0.1014.18
linux-image-oem-20.04c (Ubuntu package) - update to 5.13.0.1014.18