HIGH

CVE-2026-31431

Linux Linux Kernel 2026-04-22 CVSS v3.1

CVSS

7.8

KEV

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.

Summary dbcve.org

The Linux kernel's algif_aead cryptographic component had a vulnerability where it attempted in-place operations even though source and destination buffers come from different memory mappings, introducing unnecessary complexity. The fix reverts to out-of-place operation, which is safer and eliminates the vulnerability.

Mitigation

Apply the kernel patch that reverts algif_aead to out-of-place operation, then update the Linux kernel and reboot affected systems.

Proof of Concept

Weakness (CWE)

CWE-669

CWE-1288

EPSS Score

99.91%

Probability of exploitation in next 30 days

100th percentile

References

https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c Patch https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc Patch https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667 Patch https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82 Patch https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b Patch https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 Patch https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237 Patch https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8 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 http://www.openwall.com/lists/oss-security/2026/04/29/26 Exploit, Mailing List, Patch http://www.openwall.com/lists/oss-security/2026/04/30/10 Mailing List, Patch http://www.openwall.com/lists/oss-security/2026/04/30/11 Mailing List, Patch http://www.openwall.com/lists/oss-security/2026/04/30/12 Mailing List, Patch http://www.openwall.com/lists/oss-security/2026/04/30/14 Mailing List, Patch http://www.openwall.com/lists/oss-security/2026/04/30/15 Mailing List, Patch http://www.openwall.com/lists/oss-security/2026/04/30/16 Mailing List, Patch http://www.openwall.com/lists/oss-security/2026/04/30/17 Mailing List http://www.openwall.com/lists/oss-security/2026/04/30/18 Exploit, Mailing List http://www.openwall.com/lists/oss-security/2026/04/30/2 Mailing List http://www.openwall.com/lists/oss-security/2026/04/30/20 Mailing List http://www.openwall.com/lists/oss-security/2026/04/30/5 Exploit, Mailing List, Patch http://www.openwall.com/lists/oss-security/2026/04/30/6 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/10 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/12 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/15 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/16 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/17 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/18 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/2 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/22 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/23 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/24 Mailing List http://www.openwall.com/lists/oss-security/2026/05/01/3 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/14 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/15 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/16 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/17 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/18 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/19 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/20 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/21 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/23 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/24 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/25 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/4 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/5 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/6 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/7 Mailing List http://www.openwall.com/lists/oss-security/2026/05/02/8 Mailing List http://www.openwall.com/lists/oss-security/2026/05/03/10 Mailing List http://www.openwall.com/lists/oss-security/2026/05/03/12 Mailing List http://www.openwall.com/lists/oss-security/2026/05/03/13 Mailing List http://www.openwall.com/lists/oss-security/2026/05/03/3 Mailing List http://www.openwall.com/lists/oss-security/2026/05/03/4 Mailing List http://www.openwall.com/lists/oss-security/2026/05/03/5 Mailing List http://www.openwall.com/lists/oss-security/2026/05/03/6 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/1 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/10 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/11 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/12 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/13 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/14 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/2 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/24 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/27 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/28 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/29 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/31 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/8 Mailing List http://www.openwall.com/lists/oss-security/2026/05/04/9 Mailing List http://www.openwall.com/lists/oss-security/2026/05/06/5 Mailing List http://www.openwall.com/lists/oss-security/2026/05/07/12 Mailing List http://www.openwall.com/lists/oss-security/2026/05/07/2 Mailing List http://www.openwall.com/lists/oss-security/2026/05/08/13 Mailing List http://www.openwall.com/lists/oss-security/2026/05/18/3 Mailing List https://copy.fail Exploit https://websec.net/blog/cve-2026-31431-linux-algifaead-page-cache-write-to-root-69f38a4ccddd2db1f520f170 Exploit, Third Party Advisory https://www.kb.cert.org/vuls/id/260001 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13565 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13566 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13577 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13578 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13681 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13690 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13727 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13729 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13734 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13811 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13862 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13885 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13887 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13932 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:13936 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14097 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14112 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14137 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14165 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14230 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14301 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14339 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14773 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:14926 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:15087 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:15976 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:15978 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:16018 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:16063 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:16111 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:16208 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:16209 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:16210 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:19074 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:19225 Third Party Advisory https://access.redhat.com/errata/RHSA-2026:33486 Third Party Advisory https://access.redhat.com/security/cve/CVE-2026-31431 Third Party Advisory https://access.redhat.com/security/cve/cve-2026-31431#cve-details-mitigation Third Party Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2460538 Issue Tracking, Third Party Advisory https://cert-portal.siemens.com/productcert/html/ssa-019113.html Third Party Advisory https://cert-portal.siemens.com/productcert/html/ssa-082556.html Third Party Advisory https://cert-portal.siemens.com/productcert/html/ssa-265688.html Third Party Advisory https://cert-portal.siemens.com/productcert/html/ssa-328642.html Third Party Advisory https://github.com/theori-io/copy-fail-CVE-2026-31431 Exploit https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/ Vendor Advisory https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31431.json Third Party Advisory https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-31431 US Government Resource https://xint.io/blog/copy-fail-linux-distributions#the-fix-6 Exploit, Patch, Third Party Advisory

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Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.