CVE-2023-52435

Kernel crash via overflowing segmented-packet MSS

Published Feb 20, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel networking stack allows local users to crash the kernel through crafted packet segmentation. skb_segment() multiplies mss by partial_segs without preventing the result from equaling the reserved GSO_BY_FRAGS value, after which later code treats that sentinel as a normal size. A local low-privileged account able to submit packets to the affected segmentation path is required, and successful exploitation interrupts the entire host.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel networking stack allows local users to crash the kernel through crafted packet segmentation. skb_segment() multiplies mss by partial_segs without preventing the result from equaling the reserved GSO_BY_FRAGS value, after which later code treats that sentinel as a normal size. A local low-privileged account able to submit packets to the affected segmentation path is required, and successful exploitation interrupts the entire host.

The record

CVE
CVE-2023-52435
Published
Feb 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-119, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3953c46c3ac7eef31a9935427371c6f54a22f1ba <0d3ffbbf8631d6db0552f46250015648991c856f
  2. Affected versionversion=3953c46c3ac7eef31a9935427371c6f54a22f1ba <23d05d563b7e7b0314e65c8e882bc27eac2da8e7
  3. Affected versionversion=3953c46c3ac7eef31a9935427371c6f54a22f1ba <6c53e8547687d9c767c139cd4b50af566f58c29a
  4. Affected versionversion=3953c46c3ac7eef31a9935427371c6f54a22f1ba <8f8f185643747fbb448de6aab0efa51c679909a3
  5. Affected versionversion=3953c46c3ac7eef31a9935427371c6f54a22f1ba <95b3904a261a9f810205da560e802cc326f50d77
  6. Affected versionversion=3953c46c3ac7eef31a9935427371c6f54a22f1ba <989b0ff35fe5fc9652ee5bafbe8483db6f27b137
  7. Affected versionversion=3953c46c3ac7eef31a9935427371c6f54a22f1ba <cd1022eaf87be8e6151435bd4df4c242c347e083
  8. Affected versionversion=4.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3953c46c3ac7eef31a9935427371c6f54a22f1ba <0d3ffbbf8631d6db0552f46250015648991c856f; version=3953c46c3ac7eef31a9935427371c6f54a22f1ba <23d05d563b7e7b0314e65c8e882bc27eac2da8e7; version=3953c46c3ac7eef31a9935427371c6f54a22f1ba <6c53e8547687d9c767c139cd4b50af566f58c29a; version=3953c46c3ac7eef31a9935427371c6f54a22f1ba <8f8f185643747fbb448de6aab0efa51c679909a3; version=3953c46c3ac7eef31a9935427371c6f54a22f1ba <95b3904a261a9f810205da560e802cc326f50d77; version=3953c46c3ac7eef31a9935427371c6f54a22f1ba <989b0ff35fe5fc9652ee5bafbe8483db6f27b137; version=3953c46c3ac7eef31a9935427371c6f54a22f1ba <cd1022eaf87be8e6151435bd4df4c242c347e083; version=4.8

Published CVSS scores

6.5Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS: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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

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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