High severity · published Mar 25, 2026
CVE-2026-23364
ksmbd: Compare MACs in constant time
7.4
CVSS
0.4%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons need to be constant-time.
Replace the memcmp() with the correct function, crypto_memneq().
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.15.1 before 6.1.167; 6.2 before 6.6.130; 6.7 before 6.12.78; 6.13 before 6.18.19; 6.19 before 6.19.7; 5.15; +7 more · source: NVD
LI
Linux · Linux
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 8a665d733940592e671ec6afadcd0be80a091a80; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before cd52a0e309659537048a864211abc3ea4c5caa63; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 307afccb751f542246bd5dc68a2c1ffe1a78418c; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 2cdc56ed67615ba0921383a688f24415ebe065f3; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 93c0a22fec914ec4b697e464895a0f594e29fb28; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before f4588b85efd6007d46b80aa1b9fb746628ffb3dc; +2 more · source: vendor
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23364
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23364
Patch
https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3
Patch
https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418c
git.kernel.org
https://git.kernel.org/stable/c/8a665d733940592e671ec6afadcd0be80a091a80
Patch
https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28
Patch
https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fa
Patch
https://git.kernel.org/stable/c/cd52a0e309659537048a864211abc3ea4c5caa63
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