HIGH CISA KEV Actively Exploited

CVE-2026-31431

Q: What is CVE-2026-31431?

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

Q: Is CVE-2026-31431 actively exploited?

Yes. CVE-2026-31431 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-05-15.

Q: What is the CVSS score for CVE-2026-31431?

CVE-2026-31431 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

crypto: algif_aead - Revert to operating out-of-place

CVSS v3

7.8

HIGH

EPSS Score

3.4 %

exploit probability, as of 2026-10-12

CISA KEV

Yes

known exploited

Exploitation

active

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

kernelAlmaLinux:10all versions · fixed in 6.12.0-211.7.3.el10_2and 74 other packages
kernelAlmaLinux:9all versions · fixed in 5.14.0-611.49.2.el9_7and 116 other packages
kernelAlmaLinux:8all versions · fixed in 4.18.0-553.121.1.el8_10and 29 other packages
kernel-64k-uki-virtAlmaLinux:10all versions · fixed in 6.12.0-124.52.2.el10_1and 28 other packages
kernel-rtAlmaLinux:8all versions · fixed in 4.18.0-553.123.1.rt7.464.el8_10and 9 other packages

Vendor advisories

CVE-2026-31431 Red Hat Product Security3,276 products fixed
kernel: crypto: algif_aead - Revert to operating out-of-place
ICSA-26-265-04 CISA67 known affected
Siemens SIPLUS and SIMATIC Products
SIMATIC AX Runtime Core Linux Common Debian · SIMATIC HMI MTP1000, Unified Comfort Panel neutral (6AV2128-3KB36-0AX1) < V21.2.1 · SIMATIC HMI MTP1200 Comfort Pro for stand (expandable, flange at the bottom) (6AV2128-3MB27-1BX0) < V21.2.1
SSA-328642 Siemens ProductCERT67 known affected
SSA-328642: "Copy Fail" Vulnerability in Multiple Industrial Products
SIMATIC AX Runtime Core Linux Common Debian · SIMATIC HMI MTP1000, Unified Comfort Panel neutral (6AV2128-3KB36-0AX1) < V21.2.1 · SIMATIC HMI MTP1200 Comfort Pro for stand (expandable, flange at the bottom) (6AV2128-3MB27-1BX0) < V21.2.1
ICSA-26-209-04 CISA5 known affected
Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.6 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.6 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.6
SSA-019113 Siemens ProductCERT5 known affected
SSA-019113: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.6
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= V3.1.6 < V3.1.7 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.6 < V3.1.7 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.6 < V3.1.7
RHSA-2026:33486 Red Hat Product Security47 products fixed
Red Hat Security Advisory: kernel security, bug fix, and enhancement update

42 more advisories

Full record on NVD

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

CISA Known Exploited Vulnerability

Date Added: 2026-05-01
Patch Due Date: 2026-05-15
Ransomware Use: Unknown

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2026-05-07
Last Modified: 2026-09-08
MSRC Title: crypto: algif_aead - Revert to operating out-of-place

Frequently asked questions

What is CVE-2026-31431?

Is CVE-2026-31431 actively exploited?

Yes. CVE-2026-31431 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-05-15.

What is the CVSS score for CVE-2026-31431?

CVE-2026-31431 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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