CVE-2024-27393

Guest crash via xen-netfront receive-buffer leak

Published May 9, 2024 · Updated Aug 5, 2026

A memory leak in Linux xen-netfront 5.9 and later allows local users to exhaust guest-kernel memory and crash the guest. xennet_alloc_one_rx_buffer() omits the required page-pool cleanup or recycling step for receive buffers, leaving pages unreclaimed. The flaw is reachable only in Linux guests using Xen PV network devices; the Xen team confirms guest-userspace triggering but reports remote triggering as unknown.

CVSS severity7.5
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory leak in Linux xen-netfront 5.9 and later allows local users to exhaust guest-kernel memory and crash the guest. xennet_alloc_one_rx_buffer() omits the required page-pool cleanup or recycling step for receive buffers, leaving pages unreclaimed. The flaw is reachable only in Linux guests using Xen PV network devices; the Xen team confirms guest-userspace triggering but reports remote triggering as unknown.

The record

CVE
CVE-2024-27393
Published
May 9, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.9
  2. Affected versionversion=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <037965402a010898d34f4e35327d22c0a95cd51f
  3. Affected versionversion=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <27aa3e4b3088426b7e34584274ad45b5afaf7629
  4. Affected versionversion=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <4143b9479caa29bb2380f3620dcbe16ea84eb3b1
  5. Affected versionversion=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <7c1250796b6c262b505a46192f4716b8c6a6a8c6
  6. Affected versionversion=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <c8b7b2f158d9d4fb89cd2f68244af154f7549bb4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <037965402a010898d34f4e35327d22c0a95cd51f; version=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <27aa3e4b3088426b7e34584274ad45b5afaf7629; version=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <4143b9479caa29bb2380f3620dcbe16ea84eb3b1; version=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <7c1250796b6c262b505a46192f4716b8c6a6a8c6; version=6c5aa6fc4defc2a0977a2c59e4710d50fa1e834c <c8b7b2f158d9d4fb89cd2f68244af154f7549bb4

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.001Endpoint Denial of Service: OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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