CVE-2024-26640

Local kernel panic via unchecked zerocopy pages

Published Mar 18, 2024 · Updated Aug 5, 2026

Improper page validation in Linux TCP receive zerocopy allows local users to panic the kernel with filesystem-owned pages. can_map_frag() accepts compound pages or pages with a non-NULL mapping, so sendfile() can place ext4 page-cache pages in a loopback receive queue that TCP_ZEROCOPY_RECEIVE maps. An unprivileged local process can execute the deterministic sequence against its own sockets; the established consequence is a system-wide crash.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper page validation in Linux TCP receive zerocopy allows local users to panic the kernel with filesystem-owned pages. can_map_frag() accepts compound pages or pages with a non-NULL mapping, so sendfile() can place ext4 page-cache pages in a loopback receive queue that TCP_ZEROCOPY_RECEIVE maps. An unprivileged local process can execute the deterministic sequence against its own sockets; the established consequence is a system-wide crash.

The record

CVE
CVE-2024-26640
Published
Mar 18, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 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=4.18
  2. Affected versionversion=93ab6cc69162775201587cc9da00d5016dc890e2 <1b8adcc0e2c584fec778add7777fe28e20781e60
  3. Affected versionversion=93ab6cc69162775201587cc9da00d5016dc890e2 <577e4432f3ac810049cb7e6b71f4d96ec7c6e894
  4. Affected versionversion=93ab6cc69162775201587cc9da00d5016dc890e2 <718f446e60316bf606946f7f42367d691d21541e
  5. Affected versionversion=93ab6cc69162775201587cc9da00d5016dc890e2 <b383d4ea272fe5795877506dcce5aad1f6330e5e
  6. Affected versionversion=93ab6cc69162775201587cc9da00d5016dc890e2 <d15cc0f66884ef2bed28c7ccbb11c102aa3a0760
  7. Affected versionversion=93ab6cc69162775201587cc9da00d5016dc890e2 <f48bf9a83b1666d934247cb58a9887d7b3127b6f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.18; version=93ab6cc69162775201587cc9da00d5016dc890e2 <1b8adcc0e2c584fec778add7777fe28e20781e60; version=93ab6cc69162775201587cc9da00d5016dc890e2 <577e4432f3ac810049cb7e6b71f4d96ec7c6e894; version=93ab6cc69162775201587cc9da00d5016dc890e2 <718f446e60316bf606946f7f42367d691d21541e; version=93ab6cc69162775201587cc9da00d5016dc890e2 <b383d4ea272fe5795877506dcce5aad1f6330e5e; version=93ab6cc69162775201587cc9da00d5016dc890e2 <d15cc0f66884ef2bed28c7ccbb11c102aa3a0760; version=93ab6cc69162775201587cc9da00d5016dc890e2 <f48bf9a83b1666d934247cb58a9887d7b3127b6f

Published CVSS scores

5.5NIST NVDCVSS: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.

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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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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