Out-of-bounds read in Linux kernel - CVE-2022-47943
Published: December 26, 2022
Vulnerability identifier: #VU70484
CSH Severity: Medium
CVSSv4.0: 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:Green
CVE-ID: CVE-2022-47943
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a remote user to perform a denial of service attack.
The vulnerability exists due to an out-of-bounds read in ksmbd due to a large length in the zero DataOffset case in SMB2_WRITE call. A remote user can send specially crafted request to the ksmbd daemon, trigger an out-of-bounds write error and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
External links
- https://github.com/torvalds/linux/commit/ac60778b87e45576d7bfdbd6f53df902654e6f09
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ac60778b87e45576d7bfdbd6f53df902654e6f09
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.2
- http://www.openwall.com/lists/oss-security/2022/12/23/10