Review reviewHigh

CVE-2026-43033

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

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
7.8
EPSS
0.14%
3.39% percentile
CISA KEV
Not listed
Published
2026.05.02
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

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,

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= 104880a6b470958ddc30e139c41aa4f6ed3a5234 < 8c62f618576519dbed6816fafc623ce592953025, >= 104880a6b470958ddc30e139c41aa4f6ed3a5234 < d589abd8b019b07075fda255ceab8c8e950cdb3f, >= 104880a6b470958ddc30e139c41aa4f6ed3a5234 < 5466e7d0cd9e4f9cef9d8f18f18b60e7bc1c77e5, >= 104880a6b470958ddc30e139c41aa4f6ed3a5234 < d0c4ff6812386880f30bc64c2921299cc4d7b47f, >= 104880a6b470958ddc30e139c41aa4f6ed3a5234 < 89fe118b6470119b20c04afc36e45b81a69ea11f, >= 104880a6b470958ddc30e139c41aa4f6ed3a5234 < 153d5520c3f9fd62e71c7e7f9e34b59cf411e555, >= 104880a6b470958ddc30e139c41aa4f6ed3a5234 < cded4002d22177e8deaca1f257ecd932c9582b6b, >= 104880a6b470958ddc30e139c41aa4f6ed3a5234 < e02494114ebf7c8b42777c6cd6982f113bfdbec7, >= 4.3, >= V3.1.6, >= V3.1.5, >= 4.3 < 5.10.254, >= 5.11 < 5.15.204, >= 5.16 < 6.1.170, >= 6.2 < 6.6.137, >= 6.7 < 6.12.85, >= 6.13 < 6.18.22, >= 6.19 < 6.19.12, 7.0
Fixed versions
5.10.254, 5.15.204, 6.1.170, 6.6.137, 6.12.85, 6.18.22, 6.19.12

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-43033 — Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | SECUFOCUS NOW