Strix
69K

CVE-2026-98167

Unknown

Last modified

CVE-2026-98167 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix server->total_read for compound encrypted PDUs In receive_encrypted_standard(), server->total_read is left at the full decrypted frame size when walking sub-PDUs of a compound encrypted frame. As a result, cifs_handle_standard() passes this full size to smb2_check_message(), causing the PDU length guards to incorrectly validate the entire compound frame instead of the current sub-PDU. This allows truncated non-last sub-PDUs to bypass length validation, leading to out-of-bounds reads in smb2_get_data_area_len(). Fix this by setting server->total_read to the true length of the current sub-PDU: next_cmd for non-last sub-PDUs, and the remaining pdu_length for the last one..

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix server->total_read for compound encrypted PDUs In receive_encrypted_standard(), server->total_read is left at the full decrypted frame size when walking sub-PDUs of a compound encrypted frame. As a result, cifs_handle_standard() passes this full size to smb2_check_message(), causing the PDU length guards to incorrectly validate the entire compound frame instead of the current sub-PDU. This allows truncated non-last sub-PDUs to bypass length validation, leading to out-of-bounds reads in smb2_get_data_area_len(). Fix this by setting server->total_read to the true length of the current sub-PDU: next_cmd for non-last sub-PDUs, and the remaining pdu_length for the last one.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= b24df3e30cbf48255db866720fb71f14bf9d2f39, < 8703539d22fdbc13dd2db090ee199c3a427b8ea0; >= b24df3e30cbf48255db866720fb71f14bf9d2f39, < e78fc1d240b27349b45a0f1c3e3c2c401d7e230d; >= b24df3e30cbf48255db866720fb71f14bf9d2f39, < a46eb242e9eef3a3897d166748b23303c516e870; >= b24df3e30cbf48255db866720fb71f14bf9d2f39, < ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3; >= b24df3e30cbf48255db866720fb71f14bf9d2f39, < 282b72f9a7ef31296c48366db4128882999cc048; >= b24df3e30cbf48255db866720fb71f14bf9d2f39, < f73726b83e4756fdaa099e1bc1143293bd57ad79
LinuxLinux4.19

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98167?
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix server->total_read for compound encrypted PDUs In receive_encrypted_standard(), server->total_read is left at the full decrypted frame size when walking sub-PDUs of a compound encrypted frame. As a result, cifs_handle_standard() passes this full size to smb2_check_message(), causing the PDU length guards to incorrectly validate the entire compound frame instead of the current sub-PDU. This allows truncated non-last sub-PDUs to bypass length validation, leading to out-of-bounds reads in smb2_get_data_area_len(). Fix this by setting server->total_read to the true length of the current sub-PDU: next_cmd for non-last sub-PDUs, and the remaining pdu_length for the last one.
How severe is CVE-2026-98167?
Severity scoring for CVE-2026-98167 is pending analysis.
How do I fix CVE-2026-98167?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-98167?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST