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A high-severity vulnerability in the Linux kernel SMB client was fixed involving an off-by-8 bounds check error in the check_wsl_eas() function. The flaw allowed an untrusted SMB server to leak up to 8 bytes of kernel heap memory during extended attribute (EA) name comparison, potentially influencing Windows Subsystem for Linux (WSL) extended attribute interpretation. The issue was due to incorrect pointer arithmetic in bounds checking, leading to out-of-bounds reads. This vulnerability affects multiple Linux kernel versions prior to specific patched releases. A patch is available and included in recent Linux kernel updates distributed by Ubuntu.

The vulnerability (CVE-2026-31614) in the Linux kernel SMB client arises from an off-by-8 error in the bounds check within the check_wsl_eas() function. The bounds check incorrectly calculates the end of the EA name and value by using (u8 *)ea + nlen + 1 + vlen, whereas the correct base should be ea->ea_data due to the offset of sizeof(struct smb2_file_full_ea_info) = 8 bytes. This miscalculation allows an untrusted SMB server to cause the kernel to read up to 8 bytes beyond the intended buffer, leaking kernel heap data during EA name comparison. The vulnerability impacts the interpretation of WSL extended attributes, potentially leaking sensitive kernel memory. The issue has been fixed by correcting the bounds check to use ea->ea_data as the base pointer. The fix is included in Linux kernel versions released after the affected versions listed.

Detailed information about UBUNTU-CVE-2026-31614 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-31614 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix off-by-8 bounds check in check_wsl_eas() The bounds check uses…

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