Experts warn of a critical Linux Kernel vulnerability (CVSS score of 10) impacting SMB servers that can lead to remote code execution. . A critical Linux kernel vulnerability (CVSS score of 10) exposes SMB servers with ksmbd enabled to hack. KSMBD is a Linux kernel server that implements SMB3 protocol in kernel space for sharing files over the network. An unauthenticated, remote attacker can execute arbitrary code on vulnerable installations of the Linux Kernel. The flaw resides in the processing of SMB2_TREE_DISCONNECT commands. “This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable.” reads the advisory published by ZDI. “The specific flaw exists within the processing of SMB2_TREE_DISCONNECT commands. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the kernel.” . A severe flaw in the Linux kernel (CVSS rating of 10) puts SMB servers that utilize ksmbd at risk of distant data corruption.. Linux Kernel Flaw, SMB Server Threat, Remote Code Execution, KSMBD Vulnerability. . Brittany Day
Merry Christmas, Linux systems administrators: Here's a kernel vulnerability with a CVSS score of 10 in your SMB server for the holiday season giving an unauthenticated user remote code execution. . Yes, this sounds bad, and a score of 10 isn't reassuring at all. Luckily for the sysadmins reaching for more brandy to pour in that eggnog, it doesn't appear to be that widespread. Discovered the Thalium Team vulnerability research team at French aerospace firm Thales Group in July, the vulnerability is specific to the ksmbd module that was added to the Linux kernel in version 5.15 . Disclosure was responsibly held until a patch was issued. Unlike that other popular SMB server for Linux, which runs in userspace, ksmbd operates in the kernel. That triggered alarm bells among some users discussing its merge last year. . Linux admins, critical holiday alert: a CVSS 10 kernel vulnerability has been found, allowing remote code execution. Patch your systems urgently to prevent exploitation. Kernel Bug, Linux Admins, Remote Execution, Critical Security Issue. . Brittany Day
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