SB20261007196 - Out-of-bounds read in Linux kernel smb client

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-98170)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to trigger out-of-bounds reads.

The vulnerability exists due to insufficient bounds checking in move_smb2_ea_to_cifs() when processing a malformed extended attribute list returned by an SMB server. A remote attacker can return a specially crafted extended attribute list containing a truncated smb2_ea_info structure to trigger out-of-bounds reads.

The affected reads access the ea_name_length and ea_value_length fields.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca
• https://git.kernel.org/stable/c/34a3942e787b9c59758115bd65fe1ec89d68c7a4
• https://git.kernel.org/stable/c/d3546cecbf81d98bf3b472d341f981eb48c04f47
• https://git.kernel.org/stable/c/eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb