CVE-2026-98167

smb: client: fix server->total_read for compound encrypted PDUs

State: Published
Severity: Not scored
Published: Oct 6, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 8703539d22fdbc13dd2db090ee199c3a427b8ea0Affected b24df3e30cbf48255db866720fb71f14bf9d2f39 to before e78fc1d240b27349b45a0f1c3e3c2c401d7e230dAffected b24df3e30cbf48255db866720fb71f14bf9d2f39 to before a46eb242e9eef3a3897d166748b23303c516e870Affected b24df3e30cbf48255db866720fb71f14bf9d2f39 to before ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3Affected b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 282b72f9a7ef31296c48366db4128882999cc048Affected b24df3e30cbf48255db866720fb71f14bf9d2f39 to before f73726b83e4756fdaa099e1bc1143293bd57ad79Affected
LinuxLinux	4.19Affected before 4.19Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.54 through 6.18.Not affected 7.2.8 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 8703539d22fdbc13dd2db090ee199c3a427b8ea0Affected
b24df3e30cbf48255db866720fb71f14bf9d2f39 to before e78fc1d240b27349b45a0f1c3e3c2c401d7e230dAffected
b24df3e30cbf48255db866720fb71f14bf9d2f39 to before a46eb242e9eef3a3897d166748b23303c516e870Affected
b24df3e30cbf48255db866720fb71f14bf9d2f39 to before ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3Affected
b24df3e30cbf48255db866720fb71f14bf9d2f39 to before 282b72f9a7ef31296c48366db4128882999cc048Affected
b24df3e30cbf48255db866720fb71f14bf9d2f39 to before f73726b83e4756fdaa099e1bc1143293bd57ad79Affected

LinuxLinux

4.19Affected
before 4.19Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.54 through 6.18.*Not affected
7.2.8 through 7.2.*Not affected
7.3 and laterNot affected

References

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