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CVE-2026-98167

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

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < 8703539d22fdbc13dd2db090ee199c3a427b8ea0
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < e78fc1d240b27349b45a0f1c3e3c2c401d7e230d
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < a46eb242e9eef3a3897d166748b23303c516e870
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < 282b72f9a7ef31296c48366db4128882999cc048
Status affected
Version b24df3e30cbf48255db866720fb71f14bf9d2f39
Version < f73726b83e4756fdaa099e1bc1143293bd57ad79
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 4.19
Status affected
Version 0
Version < 4.19
Status unaffected
Version <= 6.1.*
Version 6.1.189
Status unaffected
Version <= 6.6.*
Version 6.6.158
Status unaffected
Version <= 6.12.*
Version 6.12.112
Status unaffected
Version <= 6.18.*
Version 6.18.54
Status unaffected
Version <= 7.2.*
Version 7.2.8
Status unaffected
Version <= *
Version 7.3-rc4
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.11
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Es wurden noch keine Informationen zu CWE veröffentlicht.
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