High severity · published May 1, 2026
CVE-2026-43033
crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption
7.8
CVSS
0.1%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption
When decrypting data that is not in-place (src != dst), there is
no need to save the high-order sequence bits in dst as it could
simply be re-copied from the source.
However, the data to be hashed need to be rearranged accordingly.
Thanks,
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
4.3 before 5.10.254; 5.11 before 5.15.204; 5.16 before 6.1.170; 6.2 before 6.6.137; 6.7 before 6.12.85; 6.13 before 6.18.22; +7 more · source: NVD
LI
Linux · Linux
104880a6b470958ddc30e139c41aa4f6ed3a5234 before 8c62f618576519dbed6816fafc623ce592953025; 104880a6b470958ddc30e139c41aa4f6ed3a5234 before d589abd8b019b07075fda255ceab8c8e950cdb3f; 104880a6b470958ddc30e139c41aa4f6ed3a5234 before 5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5; 104880a6b470958ddc30e139c41aa4f6ed3a5234 before d0c4ff6812386880f30bc64c2921299cc4d7b47f; 104880a6b470958ddc30e139c41aa4f6ed3a5234 before 89fe118b6470119b20c04afc36e45b81a69ea11f; 104880a6b470958ddc30e139c41aa4f6ed3a5234 before 153d5520c3f9fd62e71c7e7f9e34b59cf411e555; +3 more · source: vendor
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43033
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43033
Patch
https://git.kernel.org/stable/c/153d5520c3f9fd62e71c7e7f9e34b59cf411e555
Patch
https://git.kernel.org/stable/c/5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5
Patch
https://git.kernel.org/stable/c/89fe118b6470119b20c04afc36e45b81a69ea11f
Patch
https://git.kernel.org/stable/c/8c62f618576519dbed6816fafc623ce592953025
Patch
https://git.kernel.org/stable/c/cded4002d22177e8deaca1f257ecd932c9582b6b
Patch
https://git.kernel.org/stable/c/d0c4ff6812386880f30bc64c2921299cc4d7b47f
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