CVE-2026-31431
CISA KEVAs of 2026-05-03, CVE-2026-31431 is a CVSS 7.8 (HIGH-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 4.0%. Threadlinqs Intelligence tracks 2 threats exploiting it.
Last updated: 2026-05-03
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 v3 vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
CWE-669
Exploitation status
CISA KEV-listed (known exploited)
Threats tracking this CVE
- CVE-2026-31431 "Copy Fail" — Linux Kernel algif_aead Deterministic Local Privilege Escalation Affecting All Major Distributions — HIGH
- Linux Kernel 'Copy Fail' Local Privilege Escalation (CVE-2026-31431) — algif_aead 4-Byte Page Cache Write to setuid Root — HIGH
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
- https://copy.fail/
- https://websec.net/blog/cve-2026-31431-linux-algifaead-page-cache-write-to-root-69f38a4ccddd2db1f520f170
- https://access.redhat.com/security/cve/cve-2026-31431#cve-details-mitigation
- https://github.com/theori-io/copy-fail-CVE-2026-31431
- https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31431-3d65@gregkh/
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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.