CVE-2026-98167smb: client: fix server->total_read for compound encrypted PDUs
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 8703539d22fdbc13dd2db090ee199c3a427b8ea0; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before e78fc1d240b27349b45a0f1c3e3c2c401d7e230d; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before a46eb242e9eef3a3897d166748b23303c516e870; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before 282b72f9a7ef31296c48366db4128882999cc048; from b24df3e30cbf48255db866720fb71f14bf9d2f39 before f73726b83e4756fdaa099e1bc1143293bd57ad79 | CNA record |
References
- https://git.kernel.org/stable/c/8703539d22fdbc13dd2db090ee199c3a427b8ea0
- https://git.kernel.org/stable/c/e78fc1d240b27349b45a0f1c3e3c2c401d7e230d
- https://git.kernel.org/stable/c/a46eb242e9eef3a3897d166748b23303c516e870
- https://git.kernel.org/stable/c/ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3
- https://git.kernel.org/stable/c/282b72f9a7ef31296c48366db4128882999cc048
- https://git.kernel.org/stable/c/f73726b83e4756fdaa099e1bc1143293bd57ad79
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.