---
id: CVE-2023-3773
title: >-
  A flaw was found in the Linux kernel’s IP framework for transforming packets
  (XFRM subsystem)
summary: >-
  A flaw was found in the Linux kernel’s IP framework for transforming packets
  (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN
  privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when
  parsing n…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-125
vendor: redhat
product: enterprise_linux
affected:
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - fedora
  - linux_kernel
  - debian_linux = 10.0
  - debian_linux = 12.0
published: '2023-07-25'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:17:15.747'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-3773'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2023:6583'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2023-3773'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2218944'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2023:6583'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/security/cve/CVE-2023-3773'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2218944'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2023/dsa-5492'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.0025
epssPercentile: 0.15219
ingestedAt: '2026-10-14T23:00:02.000Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-03-05T18:33:27.598158Z'
---

## Overview

A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.

## Affected

- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `fedora`
- `linux_kernel`
- `debian_linux = 10.0`
- `debian_linux = 12.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.