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CVE-2026-43384net/tcp-ao: Fix MAC comparison to be constant-time
- 9.8CriticalCVSS base score
- 0.46%Exploitation in 30 daysEPSS · top 60% 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: net/tcp-ao: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 months later
· 3 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 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.46% · top 60% of all CVEs (13 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 0a3a809089eb1d4a0a2fd0c16b520d603988c859 – < 8be6ed64966da48b6c4726918f106c18742a5125
- affected 0a3a809089eb1d4a0a2fd0c16b520d603988c859 – < a269cbdc442f8658bca35383e34b9d0b0ff95a1c
- affected 0a3a809089eb1d4a0a2fd0c16b520d603988c859 – < 080b0e210088296dd50d6637c06c1db14246adfe
- affected 0a3a809089eb1d4a0a2fd0c16b520d603988c859 – < 67edfec516d30d3e62925c397be4a1e5185802fc
- affected 6.7
- unaffected < 6.7
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References4
- https://git.kernel.org/stable/c/8be6ed64966da48b6c4726918f106c18742a5125 (opens in a new tab)
- https://git.kernel.org/stable/c/a269cbdc442f8658bca35383e34b9d0b0ff95a1c (opens in a new tab)
- https://git.kernel.org/stable/c/080b0e210088296dd50d6637c06c1db14246adfe (opens in a new tab)
- https://git.kernel.org/stable/c/67edfec516d30d3e62925c397be4a1e5185802fc (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-2026-28690 (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-2026-43384)Record last updated .