CVE-2026-98167
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.
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Affected products
1Patches
Vulnerability mechanics
References
6- git.kernel.org/stable/c/282b72f9a7ef31296c48366db4128882999cc048nvd
- git.kernel.org/stable/c/8703539d22fdbc13dd2db090ee199c3a427b8ea0nvd
- git.kernel.org/stable/c/a46eb242e9eef3a3897d166748b23303c516e870nvd
- git.kernel.org/stable/c/e78fc1d240b27349b45a0f1c3e3c2c401d7e230dnvd
- git.kernel.org/stable/c/ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3nvd
- git.kernel.org/stable/c/f73726b83e4756fdaa099e1bc1143293bd57ad79nvd
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