How severe is CVE-2026-31431?

CVE-2026-31431 has a CVSS score of 7.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-31431?

Affected package information for CVE-2026-31431 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2026-31431?

No fixed version has been published for CVE-2026-31431 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2026-31431 actively exploited in the wild?

Yes. There are 37 known exploit references for CVE-2026-31431, including . All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2026-31431?

CVE-2026-31431 has an EPSS (Exploit Prediction Scoring System) score of 2.2%, placing it in the 85th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2026-31431 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2026-31431 (Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-05-01. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-05-15. The required action was: "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2026-31431?

CVE-2026-31431 is classified as CWE-669 (CWE-669). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2026-31431?

CVE-2026-31431 affects amazon amazon linux; arista cloudvision agni; arista cloudvision portal; arista netvisor os (1 version, e.g. 7.1.0), and 35 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2026-31431 published, and has it been updated?

CVE-2026-31431 was published on April 22, 2026 and was last updated on May 21, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2026-05-01 — agencies required to remediate by 2026-05-15

CVE-2026-31431

HIGH

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…

Published

Apr 22, 2026

Updated

May 21, 2026

Affected

0 pkgs

Patched

None yet

Exploits

37 known

EPSS Exploitation Probability

via FIRST.org ↗

2.2%probability of exploitation in next 30 days

Lower Risk85th percentile-0.04%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Affected Products

39 products · 178 configurations

amazon linuxamazon

all

Application

cloudvision agniarista

≥ 2024.4.0 && ≤ 2025.2.2

range

Application

cloudvision portalarista

≥ 2024.2.0 && ≤ 2026.1.0

range

netvisor osarista

< 7.1.0

1 version

7.1.0

Application

velocloud edgearista

≥ 4.5.0 && ≤ 6.4.1

range

Application

velocloud gatewayarista

all

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

tgies/copy-fail-c

Cross-platform C port of the Copy Fail Linux LPE (CVE-2026-31431). Discl

⭐ 424🍴 117Jun 2026

Percivalll/Copy-Fail-CVE-2026-31431-Kubernetes-PoC

PoC: fully unprivileged container escape to node-level code execution on

⭐ 167🍴 26Jun 2026

sgkdev/page_inject

CVE-2026-31431-killed page-cache exploit — code exec into containers sha

⭐ 62🍴 11Jun 2026

Crihexe/copy-fail-tiny-elf-CVE-2026-31431

Minimal no-libc Linux x86_64 ELF PoC build for Copy Fail (CVE-2026-31431

⭐ 61🍴 10May 2026

shadowabi/CVE-2026-31431-CopyFail-Universal-LPE

CVE-2026-31431 Copy Fail — Universal LPE exploit. Dynamic ELF offset + f

⭐ 57🍴 12Jun 2026

cozystack/copy-fail-blocker

BPF-LSM mitigation for CVE-2026-31431 (Copy Fail) — denies AF_ALG socket

⭐ 31🍴 5May 2026

jbnetwork-git/copy-fail-check

CVE-2026-31431 Helper basado en https://copy.fail/

⭐ 25🍴 5May 2026

liamromanis101/CVE-2026-31431-Copy-Fail---Vulnerability-Detection-Script

Detection Only.. working on an exploit PoC

⭐ 25🍴 2Jun 2026

qi4L/CVE-2026-31431-Container-Escape

CVE-2026-31431 容器逃逸

⭐ 19🍴 6May 2026

diemoeve/copyfail-rs

CopyFail (CVE-2026-31431): Linux kernel page-cache PrivEsc PoC + the onl

⭐ 19🍴 3May 2026

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2026-31431 in your stack?

O3 detects CVE-2026-31431 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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