CVE-2026-43238

System crash via skbedit range-size wraparound

Published May 6, 2026 · Updated May 6, 2026

Divide-by-zero in affected Linux Kernel releases allows local users to crash the system via a crafted skbedit queue range. The tcf_skbedit_hash() path stores the inclusive TX-queue range size in a 16-bit mapping_mod field, so a full 65,536-value range wraps to zero before a packet hash is reduced modulo that value. Exploitation requires local low-privilege access to configure the skbedit action; triggering the affected path causes a kernel crash without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in affected Linux Kernel releases allows local users to crash the system via a crafted skbedit queue range. The tcf_skbedit_hash() path stores the inclusive TX-queue range size in a 16-bit mapping_mod field, so a full 65,536-value range wraps to zero before a packet hash is reduced modulo that value. Exploitation requires local low-privilege access to configure the skbedit action; triggering the affected path causes a kernel crash without reported data disclosure or modification.

The record

CVE
CVE-2026-43238
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-369, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=38a6f0865796e26fc38fff4858f681d9ae76fa0f <015cebdfcb97b5347fb7f598ea712a281cb35840
  2. Affected versionversion=38a6f0865796e26fc38fff4858f681d9ae76fa0f <3c2b95b26860bd6f8e2310d31ea1200d3f8f173e
  3. Affected versionversion=38a6f0865796e26fc38fff4858f681d9ae76fa0f <4ece5eb4836f8ff03b9004dc2430a7169f282851
  4. Affected versionversion=38a6f0865796e26fc38fff4858f681d9ae76fa0f <59809fda4da7730cfe84a948033f47eb45db073d
  5. Affected versionversion=38a6f0865796e26fc38fff4858f681d9ae76fa0f <9c735a7d98c982a786b0db71eb6566ee00aaa04f
  6. Affected versionversion=38a6f0865796e26fc38fff4858f681d9ae76fa0f <be054cc66f739a9ba615dba9012a07fab8e7dd6f
  7. Affected versionversion=5.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=38a6f0865796e26fc38fff4858f681d9ae76fa0f <015cebdfcb97b5347fb7f598ea712a281cb35840; version=38a6f0865796e26fc38fff4858f681d9ae76fa0f <3c2b95b26860bd6f8e2310d31ea1200d3f8f173e; version=38a6f0865796e26fc38fff4858f681d9ae76fa0f <4ece5eb4836f8ff03b9004dc2430a7169f282851; version=38a6f0865796e26fc38fff4858f681d9ae76fa0f <59809fda4da7730cfe84a948033f47eb45db073d; version=38a6f0865796e26fc38fff4858f681d9ae76fa0f <9c735a7d98c982a786b0db71eb6566ee00aaa04f; version=38a6f0865796e26fc38fff4858f681d9ae76fa0f <be054cc66f739a9ba615dba9012a07fab8e7dd6f; version=5.19

Published CVSS scores

5.5NISTCVSS: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

CWE-369Divide By Zero
T1499Endpoint Denial of Service

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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