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CVE-2026-98167

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From b24df3e30cbf48255db866720fb71f14bf9d2f39 · fixed in 8703539d22fdbc13dd2db090ee199c3a427b8ea0; From b24df3e30cbf48255db866720fb71f14bf9d2f39 · fixed in e78fc1d240b27349b45a0f1c3e3c2c401d7e230d; From b24df3e30cbf48255db866720fb71f14bf9d2f39 · fixed in a46eb242e9eef3a3897d166748b23303c516e870; From b24df3e30cbf48255db866720fb71f14bf9d2f39 · fixed in ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3; From b24df3e30cbf48255db866720fb71f14bf9d2f39 · fixed in 282b72f9a7ef31296c48366db4128882999cc048; From b24df3e30cbf48255db866720fb71f14bf9d2f39 · fixed in f73726b83e4756fdaa099e1bc1143293bd57ad79

  • Linux Linux

    4.19

  • KernelLinux

    From 4.19.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 6

git.kernel.org