Use-after-free in Linux kernel - CVE-2022-47939

Vulnerability identifier: #VU70480

CSH Severity: High

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-47939

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the smb2_tree_disconnect() function in ksmbd. A remote attacker can trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

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

Install updates from vendor's website.

Linux kernel - update to 5.15.61
kernel - update to 5.10.0-60.74.0.98
kernel-headers - update to 5.10.0-60.74.0.98
kernel-tools-devel - update to 5.10.0-60.74.0.98
bpftool-debuginfo - update to 5.10.0-60.74.0.98
kernel-debuginfo - update to 5.10.0-60.74.0.98
python3-perf - update to 5.10.0-60.74.0.98
kernel-source - update to 5.10.0-60.74.0.98
bpftool - update to 5.10.0-60.74.0.98
kernel-devel - update to 5.10.0-60.74.0.98
python3-perf-debuginfo - update to 5.10.0-60.74.0.98
perf-debuginfo - update to 5.10.0-60.74.0.98
kernel-debugsource - update to 5.10.0-60.74.0.98
kernel-tools-debuginfo - update to 5.10.0-60.74.0.98
kernel-tools - update to 5.10.0-60.74.0.98
perf - update to 5.10.0-60.74.0.98

• https://www.zerodayinitiative.com/advisories/ZDI-22-1690/
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.61
• https://lore.kernel.org/lkml/20220815180340.880995784@linuxfoundation.org/

• Remote code execution in Linux kernel ksmbd
• openEuler 22.03 LTS update for kernel