---
title: "CVE-2026-31431: Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-31431/
description: "CVE-2026-31431 (Linux Kernel): Exploited in the wild (CISA KEV). In the Linux kernel, the following vulnerability has been resolved: crypto: algifaead …"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-22
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-31431"
kev: true
cvss: 7.8
epss: 0.03437
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-31431: Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Linux Kernel. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-05-01, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-05-15 ; treat that as the outer limit, not the target.
- EPSS 3.4% , percentile 89: FIRST’s model estimates a 3.4% chance of exploitation activity in the next 30 days, higher than 89% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.
- Editorial verdict: Act now. Copy Fail: Exploited Linux Kernel Root Exploit Since 2017 — Any Linux box that runs code from more than one trust level (CI runners, container hosts, shared servers) needs a patched kernel and reboot now; single-user machines can patch on a short cycle.

## What it is

In the Linux kernel, the following vulnerability has been resolved: crypto: algifaead - 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 algifaead 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.

## Affected products (CVE record)

- Linux Linux: 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 < 893d22e0135fa394db81df88697fba6032747667, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 < 19d43105a97be0810edbda875f2cd03f30dc130c, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 < 961cfa271a918ad4ae452420e7c303149002875b, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 < 3115af9644c342b356f3f07a4dd1c8905cd9a6fc, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 < 8b88d99341f139e23bdeb1027a2a3ae10d341d82, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 < fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 < ce42ee423e58dffa5ec03524054c9d8bfd4f6237, 72548b093ee38a6d4f2a19e6ef1948ae05c181f7 < a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5
- Linux Linux: 4.14

## Severity

- Linux CVSS 3.1: 7.8 `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
- redhat-SADP CVSS 3.1: 7.8 `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-05-01; federal due date 2026-05-15. Known ransomware use: Unknown.
- CISA required action: "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 3.44% probability of exploitation activity in the next 30 days; percentile 89.

## Sources

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- [Listed in CISA KEV notes (git.kernel.org)](https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/about/)
- [CVE.org record CVE-2026-31431](https://www.cve.org/CVERecord?id=CVE-2026-31431)
- [NVD entry CVE-2026-31431](https://nvd.nist.gov/vuln/detail/CVE-2026-31431)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-31431)
- [git.kernel.org](https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667)
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- [git.kernel.org](https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237)
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- [github.com](https://github.com/theori-io/copy-fail-CVE-2026-31431)
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- [copy.fail](https://copy.fail)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/04/30/11)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/04/30/14)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/02/6)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/02/14)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/02/15)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/02/17)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/02/23)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/02/25)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/03/3)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/03/4)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/03/10)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/03/5)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/03/6)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/03/12)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/04/1)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/04/11)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/04/13)
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- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/06/5)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/07/2)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/05/07/12)
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- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-31431)
- [RHBZ#2460538](https://bugzilla.redhat.com/show_bug.cgi?id=2460538)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31431.json)

---
Source page: https://erroneo.us/security/cve/CVE-2026-31431/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt