Out-of-bounds read in Linux kernel - CVE-2022-47943

Vulnerability identifier: #VU70484

CSH Severity: Medium

CVSS v4: 7.1 [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]

CVE-ID: CVE-2022-47943

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

Linux kernel
openEuler
kernel-tools-debuginfo
kernel
kernel-debuginfo
kernel-headers
python3-perf-debuginfo
kernel-source
bpftool-debuginfo
perf-debuginfo
kernel-tools-devel
bpftool
kernel-tools
python3-perf
perf
kernel-debugsource
kernel-devel

Install update from vendor's website.

Linux kernel - update to 5.19.2
kernel-tools-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-headers - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
python3-perf-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-source - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
bpftool-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
perf-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-tools-devel - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
bpftool - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-tools - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
python3-perf - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
perf - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-debugsource - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-devel - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90

• 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

• Multiple vulnerabilities in Linux kernel ksmbd
• openEuler 22.03 LTS update for kernel
• openEuler 22.03 LTS SP1 update for kernel