High 7.4Published Mar 25, 2026

CVE-2026-23364ksmbd: Compare MACs in constant time

Updated under an hour ago (Oct 26, 2026, 10:00 PM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
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: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 8a665d733940592e671ec6afadcd0be80a091a80; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before cd52a0e309659537048a864211abc3ea4c5caa63; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 307afccb751f542246bd5dc68a2c1ffe1a78418c; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 2cdc56ed67615ba0921383a688f24415ebe065f3; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 93c0a22fec914ec4b697e464895a0f594e29fb28; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before f4588b85efd6007d46b80aa1b9fb746628ffb3dc; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before c5794709bc9105935dbedef8b9cf9c06f2b559fa	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.15.1 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.7; 5.15; 7.0; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/8a665d733940592e671ec6afadcd0be80a091a80
https://git.kernel.org/stable/c/cd52a0e309659537048a864211abc3ea4c5caa63	patch
https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418c	patch
https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3	patch
https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28	patch
https://git.kernel.org/stable/c/f4588b85efd6007d46b80aa1b9fb746628ffb3dc	patch
https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fa	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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.