Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2025-22039
CVE-2025-22039:
Linux Kernel vulnerability analysis and mitigation
Overview
A vulnerability in the Linux kernel's ksmbd module was discovered and assigned CVE-2025-22039. The issue was disclosed on April 16, 2025, affecting the dacloffset field handling in the Linux kernel's SMB server implementation (NVD, Ubuntu Security).
Technical details
The vulnerability stems from the dacloffset field being originally typed as int and used in an unchecked addition, which could overflow and bypass the existing bounds check in both smb_check_perm_dacl() and smb_inherit_dacl() functions. The issue was resolved by converting dacloffset to unsigned int and implementing check_add_overflow() to validate access to the DACL (NVD).
Impact
This vulnerability could result in out-of-bounds memory access and a kernel crash when dereferencing the DACL pointer, potentially leading to system instability or denial of service (NVD).
Mitigation and workarounds
The vulnerability has been patched in Linux kernel version 6.12.25-1 for Debian systems. Various Linux distributions including Ubuntu, Red Hat, and Debian are working on releasing updated kernel packages to address this vulnerability (Debian Tracker, Ubuntu Security).
Additional resources
Linux Distribution fix status
Fix availability across major Linux distributions and their releases.
bionic
linux
bionic (esm-infra)
linux
bionic (fips-updates)
linux-fips
bionic (fips)
linux-fips
devel
linux
focal
linux
focal (esm-infra)
linux-hwe-5.15: 5.15.0-202.212~20.04.1
focal (fips-updates)
linux-fips
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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