# 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. - Page: https://www.vulneraibility.com/cve/CVE-2026-31431 - CVSS: 7.8 - Known exploited: yes, in CISA KEV since 2026-05-01; CISA due date 2026-05-15 - EPSS: 98.11% - Public exploit code: 1 Metasploit module ยท 326 GitHub proofs of concept (first 2026-03-08) - CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-04-29) - Weakness: CWE-669, CWE-1288 - Published: 2026-04-22 ## Affected versions - Linux: affected >= 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and < 893d22e0135fa394db81df88697fba6032747667; >= 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and < 19d43105a97be0810edbda875f2cd03f30dc130c; >= 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and < 961cfa271a918ad4ae452420e7c303149002875b; >= 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and < 3115af9644c342b356f3f07a4dd1c8905cd9a6fc; >= 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and < 8b88d99341f139e23bdeb1027a2a3ae10d341d82; >= 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and < fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8; >= 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and < ce42ee423e58dffa5ec03524054c9d8bfd4f6237; >= 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 and < a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5; 4.14; fixed in < 4.14, >= 5.10.254 and <= 5.10.*, >= 5.15.204 and <= 5.15.*, >= 6.1.170 and <= 6.1.*, >= 6.6.137 and <= 6.6.*, >= 6.12.85 and <= 6.12.*, >= 6.18.22 and <= 6.18.*, >= 6.19.12 and <= 6.19.*, >= 7.0 and <= * A version outside these ranges is not a statement that it is unaffected. ## References - [other] https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667 - [other] https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c - [other] https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b - [other] https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc - [other] https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82 - [other] https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8 - [other] https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237 - [other] https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 - [exploit] https://github.com/theori-io/copy-fail-CVE-2026-31431 - [mitigation] https://xint.io/blog/copy-fail-linux-distributions#the-fix-6 - [mitigation] https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/ - [mitigation] https://access.redhat.com/security/cve/cve-2026-31431#cve-details-mitigation - [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-31431 - [other] http://www.openwall.com/lists/oss-security/2026/04/29/23 - [other] https://copy.fail - [other] http://www.openwall.com/lists/oss-security/2026/04/29/25 - [other] http://www.openwall.com/lists/oss-security/2026/04/29/26 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/2 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/5 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/6 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/10 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/11 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/12 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/14 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/15 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/16 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/17 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/18 - [other] https://websec.net/blog/cve-2026-31431-linux-algifaead-page-cache-write-to-root-69f38a4ccddd2db1f520f170 - [other] http://www.openwall.com/lists/oss-security/2026/04/30/20 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/2 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/3 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/10 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/12 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/15 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/16 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/17 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/18 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/22 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/23 - [other] http://www.openwall.com/lists/oss-security/2026/05/01/24 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/4 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/5 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/6 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/7 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/8 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/14 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/15 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/16 - [other] http://www.openwall.com/lists/oss-security/2026/05/02/17 --- Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.