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CVE

CVE-2026-74521

ksmbd: use memcmp() to compare ClientGUIDs
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CVE

CVE-2026-74521

ksmbd: use memcmp() to compare ClientGUIDs

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: use memcmp() to compare ClientGUIDs

ClientGUID is a fixed-size binary value and can contain embedded NUL

bytes. strncmp() stops comparing at the first NUL byte, so different

ClientGUID values can incorrectly be treated as equal.

Use memcmp() in SMB3 multichannel session binding and

FSCTLVALIDATENEGOTIATEINFO to compare all SMB2CLIENTGUIDSIZE

bytes.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/d535363299822c5caa543787b21bd5cfa3e41949, https://git.kernel.org/stable/c/e8bb506e6ef749ac0336f3e579d8d02396b7d832, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74521.json, https://nvd.nist.gov/vuln/detail/CVE-2026-74521, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.00315%
EPSS Percentile
0.23727%
Introduced Version
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9,5.15.0,0
Fix Available
e8bb506e6ef749ac0336f3e579d8d02396b7d832,7.1.8

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