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How the mentioned CVE works:
The vulnerability is a use-after-free flaw within the ksmbd (SMB server) module of the Linux kernel. It occurs during the session logoff process. The `sess->user` object is freed while it might still be in use by a concurrent thread. For instance, another connection could be in the `smb2_sess_setup` function, attempting to bind to the same session and using the `sess->user` object. If the object’s memory is freed by the logoff thread and then reallocated, the session setup thread will access invalid memory, leading to a kernel crash or potential code execution.
Platform: Linux Kernel
Version: ksmbd module
Vulnerability : Use-After-Free
Severity: Critical
date: 05/20/2025
Prediction: 07/15/2025
What Undercode Say:
`cat /proc/version`
`lsmod | grep ksmbd`
`dmesg | grep -i “panic\|oops”`
`checksec –kernel`
`sudo grep -r “sess->user” /usr/src/linux-headers-/`
How Exploit:
Craft concurrent SMB requests.
Trigger session logoff race.
Execute arbitrary kernel code.
Kernel panic denial-of-service.
Protection from this CVE
Apply kernel patches.
Disable ksmbd module.
Use kernel hardening features.
Monitor system logs.
Impact:
Kernel memory corruption.
System crash denial-of-service.
Potential privilege escalation.
Complete system compromise.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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