CVE-2022-47939
CWE-416Published: December 23, 2022· Updated: Jun 17, 2026
Official Description
An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.19 before 5.19.2. fs/ksmbd/smb2pdu.c has a use-after-free and OOPS for SMB2_TREE_DISCONNECT.
Risk Analysis
The Linux kernel ksmbd implementation contains a use-after-free vulnerability during SMB2 tree disconnect operations. This can lead to system instability or arbitrary code execution by a remote attacker. Given the critical CVSS score, this represents a significant risk to affected Linux environments.
No public exploit is known, and it is not in CISA KEV. The vulnerability is remotely exploitable with low complexity.
Update the Linux kernel to version 5.19.2 or later to include the necessary patches.
Technical Analysis
CVE-2022-47939 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (12)
Quick Facts
Related CVEs (CWE-416)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2022-47939 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts