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CVE-2026-23364ksmbd: Compare MACs in constant time
- 7.4HighCVSS base score
- 0.43%Exploitation in 30 daysEPSS · top 63% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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().
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Modified | 3.1 | High7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.43% · top 63% of all CVEs (14 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Affected products
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 8a665d733940592e671ec6afadcd0be80a091a80
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < cd52a0e309659537048a864211abc3ea4c5caa63
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 307afccb751f542246bd5dc68a2c1ffe1a78418c
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 2cdc56ed67615ba0921383a688f24415ebe065f3
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 93c0a22fec914ec4b697e464895a0f594e29fb28
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < f4588b85efd6007d46b80aa1b9fb746628ffb3dc
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < c5794709bc9105935dbedef8b9cf9c06f2b559fa
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.210 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.7 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/8a665d733940592e671ec6afadcd0be80a091a80 (opens in a new tab)
- https://git.kernel.org/stable/c/cd52a0e309659537048a864211abc3ea4c5caa63 (opens in a new tab)
- https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418c (opens in a new tab)
- https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3 (opens in a new tab)
- https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28 (opens in a new tab)
- https://git.kernel.org/stable/c/f4588b85efd6007d46b80aa1b9fb746628ffb3dc (opens in a new tab)
- https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fa (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-15344 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-23364)Record last updated .