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.

Weakness

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 Software

References

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