CVE-2026-31431

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.

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 94.02%• Percentile: 100%

Techniques & Countermeasures

• CWE-669•Incorrect Resource Transfer Between Spheres

  The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource.

Affected Systems

• amazon•amazon_linux

  na

• arista•cloudvision_agni

  ≥ 2024.4.0, ≤ 2025.2.2

• arista•cloudvision_portal

  ≥ 2024.2.0, ≤ 2026.1.0

• arista•netvisor_os

  < 7.1.0 | 7.1.0 | 7.1.0:hotfix7

• arista•velocloud_edge

  ≥ 4.5.0, ≤ 6.4.1

• arista•velocloud_gateway

  na

• canonical•ubuntu_linux

  na | 14.04 | 16.04 | 18.04 | 20.04 | 22.04 | 24.04 | 25.10

• debian•debian_linux

  11.0 | 12.0 | 13.0

• linux•linux

  ≥ 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, < 893d22e0135fa394db81df88697fba6032747667 | ≥ 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, < 19d43105a97be0810edbda875f2cd03f30dc130c | ≥ 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, < 961cfa271a918ad4ae452420e7c303149002875b | ≥ 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, < 3115af9644c342b356f3f07a4dd1c8905cd9a6fc | ≥ 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, < 8b88d99341f139e23bdeb1027a2a3ae10d341d82 | ≥ 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, < fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8 | ≥ 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, < ce42ee423e58dffa5ec03524054c9d8bfd4f6237 | ≥ 72548b093ee38a6d4f2a19e6ef1948ae05c181f7, < a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 | 4.14

• linux•linux_kernel

  ≥ 4.14, < 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:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6

• nixos•nixos

  < 25.11

• novell•suse_linux

  na

• opensuse•leap

  15.3 | 15.4 | 15.5 | 15.6

• redhat•enterprise_linux

  8.0 | 9.0 | 10.0 | 10.1

• redhat•openshift_container_platform

  4.0

• siemens•simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware

  ≥ 3.1.5

• siemens•simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware

  ≥ 3.1.5

• siemens•simatic_s7-1500_tm_mfp_firmware

  < 1.1

• siemens•siplus_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware

  ≥ 3.1.5

• suse•basesystem_module

  15:sp1 | 15:sp2 | 15:sp3 | 15:sp4 | 15:sp5 | 15:sp6 | 15:sp7

• suse•caas_platform

  4.0

• suse•development_tools_module

  15:sp1 | 15:sp2 | 15:sp3 | 15:sp4 | 15:sp5 | 15:sp6 | 15:sp7

• suse•enterprise_storage

  6.0 | 7.0 | 7.1

• suse•legacy_module

  15:sp7

• suse•linux_enterprise_desktop

  11:sp4 | 12:sp4 | 15:sp1 | 15:sp2 | 15:sp3 | 15:sp4 | 15:sp5 | 15:sp6 | 15:sp7

• suse•linux_enterprise_high_availability_extension

  15:sp4 | 15:sp6 | 15:sp7 | 16.0

• suse•linux_enterprise_high_performance_computing

  15.0:sp1 | 15.0:sp2 | 15.0:sp3 | 15.0:sp4 | 15.0:sp5 | 15.0:sp6 | 15.0:sp7

• suse•linux_enterprise_live_patching

  12:sp5 | 15:sp4 | 15:sp5 | 15:sp6 | 15:sp7

• suse•linux_enterprise_micro

  5.0 | 5.1 | 5.2 | 5.3 | 5.4 | 5.5

• suse•linux_enterprise_real_time

  15.0:sp2 | 15.0:sp3 | 15.0:sp4 | 15.0:sp5 | 15.0:sp6 | 15.0:sp7

• suse•linux_enterprise_server

  11:sp4 | 12:sp4 | 12:sp5 | 15:sp1 | 15:sp2 | 15:sp3 | 15:sp4 | 15:sp5 | 15:sp6 | 15:sp7 | 16.0 | 16.1

• suse•linux_enterprise_workstation_extension

  15:sp7

• suse•linux_micro

  6.0 | 6.1 | 6.2

• suse•manager_proxy

  4.0 | 4.1 | 4.2 | 4.3

• suse•manager_retail_branch_server

  4.0 | 4.1 | 4.2 | 4.3

• suse•manager_server

  4.0 | 4.1 | 4.2 | 4.3

• suse•openstack_cloud

  9.0

• suse•openstack_cloud_crowbar

  9.0

• suse•public_cloud_module

  15:sp6 | 15:sp7

• suse•realtime_module

  15:sp3 | 15:sp4 | 15:sp5 | 15:sp6 | 15:sp7

• suse•suse_linux

  na

• vmware•velocloud_orchestrator

  na

References (86)

• https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8
• https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237
• https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5
• https://github.com/theori-io/copy-fail-CVE-2026-31431
• http://www.openwall.com/lists/oss-security/2026/04/29/23
• https://copy.fail
• http://www.openwall.com/lists/oss-security/2026/04/29/25
• http://www.openwall.com/lists/oss-security/2026/04/29/26
• http://www.openwall.com/lists/oss-security/2026/04/30/2
• http://www.openwall.com/lists/oss-security/2026/04/30/5
• http://www.openwall.com/lists/oss-security/2026/04/30/6
• https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667
• https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c
• https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b
• https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc
• https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82
• http://www.openwall.com/lists/oss-security/2026/04/30/10
• http://www.openwall.com/lists/oss-security/2026/04/30/11
• http://www.openwall.com/lists/oss-security/2026/04/30/12
• http://www.openwall.com/lists/oss-security/2026/04/30/14
• http://www.openwall.com/lists/oss-security/2026/04/30/15
• http://www.openwall.com/lists/oss-security/2026/04/30/16
• http://www.openwall.com/lists/oss-security/2026/04/30/17
• http://www.openwall.com/lists/oss-security/2026/04/30/18
• https://websec.net/blog/cve-2026-31431-linux-algifaead-page-cache-write-to-root-69f38a4ccddd2db1f520f170
• http://www.openwall.com/lists/oss-security/2026/04/30/20
• http://www.openwall.com/lists/oss-security/2026/05/01/2
• http://www.openwall.com/lists/oss-security/2026/05/01/3
• https://xint.io/blog/copy-fail-linux-distributions#the-fix-6
• https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/
• https://access.redhat.com/security/cve/cve-2026-31431#cve-details-mitigation
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-31431
• http://www.openwall.com/lists/oss-security/2026/05/01/10
• http://www.openwall.com/lists/oss-security/2026/05/01/12
• http://www.openwall.com/lists/oss-security/2026/05/01/15
• http://www.openwall.com/lists/oss-security/2026/05/01/16
• http://www.openwall.com/lists/oss-security/2026/05/01/17
• http://www.openwall.com/lists/oss-security/2026/05/01/18
• http://www.openwall.com/lists/oss-security/2026/05/01/22
• http://www.openwall.com/lists/oss-security/2026/05/01/23
• http://www.openwall.com/lists/oss-security/2026/05/01/24
• http://www.openwall.com/lists/oss-security/2026/05/02/4
• http://www.openwall.com/lists/oss-security/2026/05/02/5
• http://www.openwall.com/lists/oss-security/2026/05/02/6
• http://www.openwall.com/lists/oss-security/2026/05/02/7
• http://www.openwall.com/lists/oss-security/2026/05/02/8
• http://www.openwall.com/lists/oss-security/2026/05/02/14
• http://www.openwall.com/lists/oss-security/2026/05/02/15
• http://www.openwall.com/lists/oss-security/2026/05/02/16
• http://www.openwall.com/lists/oss-security/2026/05/02/17
• http://www.openwall.com/lists/oss-security/2026/05/02/18
• http://www.openwall.com/lists/oss-security/2026/05/02/19
• http://www.openwall.com/lists/oss-security/2026/05/02/20
• http://www.openwall.com/lists/oss-security/2026/05/02/21
• http://www.openwall.com/lists/oss-security/2026/05/02/23
• http://www.openwall.com/lists/oss-security/2026/05/02/24
• http://www.openwall.com/lists/oss-security/2026/05/02/25
• http://www.openwall.com/lists/oss-security/2026/05/03/3
• http://www.openwall.com/lists/oss-security/2026/05/03/4
• http://www.openwall.com/lists/oss-security/2026/05/03/10
• http://www.openwall.com/lists/oss-security/2026/05/03/5
• http://www.openwall.com/lists/oss-security/2026/05/03/6
• http://www.openwall.com/lists/oss-security/2026/05/03/12
• http://www.openwall.com/lists/oss-security/2026/05/03/13
• http://www.openwall.com/lists/oss-security/2026/05/04/1
• http://www.openwall.com/lists/oss-security/2026/05/04/2
• http://www.openwall.com/lists/oss-security/2026/05/04/10
• http://www.openwall.com/lists/oss-security/2026/05/04/11
• http://www.openwall.com/lists/oss-security/2026/05/04/12
• http://www.openwall.com/lists/oss-security/2026/05/04/13
• http://www.openwall.com/lists/oss-security/2026/05/04/14
• http://www.openwall.com/lists/oss-security/2026/05/04/8
• http://www.openwall.com/lists/oss-security/2026/05/04/9
• http://www.openwall.com/lists/oss-security/2026/05/04/24
• http://www.openwall.com/lists/oss-security/2026/05/04/27
• http://www.openwall.com/lists/oss-security/2026/05/04/28
• http://www.openwall.com/lists/oss-security/2026/05/04/29
• http://www.openwall.com/lists/oss-security/2026/05/04/31
• http://www.openwall.com/lists/oss-security/2026/05/06/5
• http://www.openwall.com/lists/oss-security/2026/05/07/2
• http://www.openwall.com/lists/oss-security/2026/05/07/12
• http://www.openwall.com/lists/oss-security/2026/05/08/13
• https://www.kb.cert.org/vuls/id/260001
• https://cert-portal.siemens.com/productcert/html/ssa-265688.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• http://www.openwall.com/lists/oss-security/2026/05/18/3