High 7.8Known exploited (CISA KEV)Published Apr 22, 2026

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-place

Updated under an hour ago (Oct 27, 2026, 5:50 PM ET)

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It affects Linux and 59 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since May 1, 2026; federal agencies had to remediate by May 15, 2026. Treat that date as your deadline.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-669, CWE-1288
Known exploited: Added to CISA KEV May 1, 2026; federal remediation due May 15, 2026"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 98.11% (percentile 100)
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	72548b093ee38a6d4f2a19e6ef1948ae05c181f7 builds before 893d22e0135fa394db81df88697fba6032747667; 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 builds before 19d43105a97be0810edbda875f2cd03f30dc130c; 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 builds before 961cfa271a918ad4ae452420e7c303149002875b; 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 builds before 3115af9644c342b356f3f07a4dd1c8905cd9a6fc; 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 builds before 8b88d99341f139e23bdeb1027a2a3ae10d341d82; from 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 before fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8; from 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 before ce42ee423e58dffa5ec03524054c9d8bfd4f6237; from 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 before a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5	CNA record
Siemens SIMATIC AX Runtime Core Linux Common Debian siemens:simatic_ax_runtime_core_linux_common_debian (from the name)	all versions	CISA ADP
Siemens SIMATIC AX Runtime Core Linux Common Debian arm64 siemens:simatic_ax_runtime_core_linux_common_debian_arm64 (from the name)	all versions	CISA ADP
Siemens SIMATIC AX Runtime Core Linux Platform Container Common Debian Development siemens:simatic_ax_runtime_core_linux_platform_container_common_debian_development (from the name)	all versions	CISA ADP
Siemens SIMATIC AX Runtime Core Linux VMWare Development siemens:simatic_ax_runtime_core_linux_vmware_development (from the name)	all versions	CISA ADP
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V6.0	CISA ADP
Siemens SIMATIC HMI MTP1000 Unified Basic siemens:simatic_hmi_mtp1000_unified_basic (from the name)	before V21 Update 2 SR1	CISA ADP
Siemens SIMATIC HMI MTP1000 Unified Comfort Panel siemens:simatic_hmi_mtp1000_unified_comfort_panel (from the name)	before V21 Update 2 SR1	CISA ADP
Siemens SIMATIC HMI MTP1000 Unified Comfort Panel hygienic siemens:simatic_hmi_mtp1000_unified_comfort_panel_hygienic (from the name)	before V21 Update 2 SR1	CISA ADP
Siemens SIMATIC HMI MTP1000 Unified Comfort Panel hygienic neutral design siemens:simatic_hmi_mtp1000_unified_comfort_panel_hygienic_neutral_design (from the name)	before V21 Update 2 SR1	CISA ADP
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References

References

https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667	patch
https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c	patch
https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b	patch
https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc	patch
https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82	patch
https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8	patch
https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237	patch
https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5	patch
http://www.openwall.com/lists/oss-security/2026/04/29/23	exploit, mailing-list, patch
http://www.openwall.com/lists/oss-security/2026/04/29/25	mailing-list, patch
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.