Critical severity · published May 8, 2026
CVE-2026-43384
net/tcp-ao: Fix MAC comparison to be constant-time
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.7 before 6.12.78; 6.13 before 6.18.19; 6.19 before 6.19.9; 7.0; 7.0 · source: NVD
LI
Linux · Linux
0a3a809089eb1d4a0a2fd0c16b520d603988c859 before 8be6ed64966da48b6c4726918f106c18742a5125; 0a3a809089eb1d4a0a2fd0c16b520d603988c859 before a269cbdc442f8658bca35383e34b9d0b0ff95a1c; 0a3a809089eb1d4a0a2fd0c16b520d603988c859 before 080b0e210088296dd50d6637c06c1db14246adfe; 0a3a809089eb1d4a0a2fd0c16b520d603988c859 before 67edfec516d30d3e62925c397be4a1e5185802fc; 6.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43384
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43384
Patch
https://git.kernel.org/stable/c/080b0e210088296dd50d6637c06c1db14246adfe
Patch
https://git.kernel.org/stable/c/67edfec516d30d3e62925c397be4a1e5185802fc
Patch
https://git.kernel.org/stable/c/8be6ed64966da48b6c4726918f106c18742a5125
Patch
https://git.kernel.org/stable/c/a269cbdc442f8658bca35383e34b9d0b0ff95a1c
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