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.
CVE-2026-98167
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98167
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
"lessThan": "8703539d22fdbc13dd2db090ee199c3a427b8ea0",
"versionType": "git"
},
{
"status": "affected",
"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
"lessThan": "e78fc1d240b27349b45a0f1c3e3c2c401d7e230d",
"versionType": "git"
},
{
"status": "affected",
"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
"lessThan": "a46eb242e9eef3a3897d166748b23303c516e870",
"versionType": "git"
},
{
"status": "affected",
"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
"lessThan": "ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3",
"versionType": "git"
},
{
"status": "affected",
"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
"lessThan": "282b72f9a7ef31296c48366db4128882999cc048",
"versionType": "git"
},
{
"status": "affected",
"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
"lessThan": "f73726b83e4756fdaa099e1bc1143293bd57ad79",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98167
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38253 · Revision 1
- Added to Heist Feed
- Publisher date