A critical remote code execution vulnerability in the Linux kernel has been publicly disclosed by Trend Micro's Zero Day Initiative in its ZDI-22-1690 advisory. The vulnerability has been given a CVSSv3 of 10.0. There are no reports of active exploitation.

CVE-2022-47939: Critical RCE Vulnerability in Linux Kernel

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.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-013416 advisory.

    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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-010715 advisory.

    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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2022-47939)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of kernel installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2022-47939 advisory.

  - 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. (CVE-2022-47939)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS / 22.04 LTS host is running a ksmbd server that is affected by multiple vulnerabilities:

  - An unauthenticated remote code execution vulnerability in the ksmbd component of the Linux kernel.
    (CVE-2022-47939)

  - An authenticated remote code execution vulnerability in the ksmbd component of the Linux kernel.
    (CVE-2022-47942)

  - An unauthenticated remote denial of service vulnerability in the ksmbd component of the Linux     kernel. (CVE-2022-47941)

  - Authenticated denial of service vulnerabilities in the ksmbd component of the Linux kernel.
    (CVE-2022-47938, CVE-2022-47940)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
309548	Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013416)	Nessus	Unity Linux Local Security Checks	Local	critical
309037	Unity Linux 20.1070e Security Update: kernel (UTSA-2026-010715)	Nessus	Unity Linux Local Security Checks	Local	critical
244684	Linux Distros Unpatched Vulnerability : CVE-2022-47939	Nessus	Misc.	Local	critical
239841	TencentOS Server 4: kernel (TSSA-2024:0960)	Nessus	Tencent Local Security Checks	Local	critical
172740	CBL Mariner 2.0 Security Update: kernel (CVE-2022-47939)	Nessus	MarinerOS Local Security Checks	Local	critical
169894	Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel kmsbd multiple vulnerabilities	Nessus	Ubuntu Local Security Checks	Local	critical

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CVE-2022-47939

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