---
title: "CVE-2024-1086: Linux Kernel Use-After-Free Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-1086/
description: "CVE-2024-1086 (Linux Kernel): Exploited in the wild (CISA KEV). A use-after-free vulnerability in the Linux kernel's netfilter: nftables component can be…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-01-31
date_modified: 2026-08-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-1086"
kev: true
cvss: 7.8
epss: 0.28058
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-1086: Linux Kernel Use-After-Free 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 2024-05-30, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-06-20 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 28.1% , percentile 98: FIRST’s model estimates a 28.1% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). 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.

## What it is

A use-after-free vulnerability in the Linux kernel's netfilter: nftables component can be exploited to achieve local privilege escalation. The nftverdictinit() function allows positive values as drop error within the hook verdict, and hence the nfhookslow() function can cause a double free vulnerability when NFDROP is issued with a drop error which resembles NFACCEPT. We recommend upgrading past commit f342de4e2f33e0e39165d8639387aa6c19dff660.

## Affected products (CVE record)

- Linux Kernel: 3.15 < 6.8

## Severity

- Google 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 2024-05-30; federal due date 2024-06-20. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions 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): 28.06% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [git.kernel.org](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f342de4e2f33e0e39165d8639387aa6c19dff660)
- [CVE.org record CVE-2024-1086](https://www.cve.org/CVERecord?id=CVE-2024-1086)
- [NVD entry CVE-2024-1086](https://nvd.nist.gov/vuln/detail/CVE-2024-1086)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-1086)
- [kernel.dance](https://kernel.dance/f342de4e2f33e0e39165d8639387aa6c19dff660)
- [lists.fedoraproject.org](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7LSPIOMIJYTLZB6QKPQVVAYSUETUWKPF/)
- [github.com](https://github.com/Notselwyn/CVE-2024-1086)
- [news.ycombinator.com](https://news.ycombinator.com/item?id=39828424)
- [pwning.tech](https://pwning.tech/nftables/)
- [openwall.com](http://www.openwall.com/lists/oss-security/2024/04/15/2)
- [openwall.com](http://www.openwall.com/lists/oss-security/2024/04/10/23)
- [openwall.com](http://www.openwall.com/lists/oss-security/2024/04/10/22)
- [openwall.com](http://www.openwall.com/lists/oss-security/2024/04/14/1)
- [openwall.com](http://www.openwall.com/lists/oss-security/2024/04/17/5)
- [security.netapp.com](https://security.netapp.com/advisory/ntap-20240614-0009/)
- [lists.debian.org](https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html)
- [lists.debian.org](https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html)

---
Source page: https://erroneo.us/security/cve/CVE-2024-1086/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt