CVE-2026-43380

Local kernel memory corruption via swapped bin2hex buffers

Published May 8, 2026 · Updated May 8, 2026

Stack buffer overflow in Linux Kernel 5.11 and later affected branches allows local users to corrupt kernel memory through a debugfs read. q54sj108a2_debugfs_read passes the 34-byte data buffer as bin2hex's destination, so a 32-byte input produces 64 output bytes and overwrites 30 stack bytes. Reachability requires local access to the q54sj108a2 driver's debugfs entry; the resulting corruption can disclose or alter kernel memory or crash the system.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack buffer overflow in Linux Kernel 5.11 and later affected branches allows local users to corrupt kernel memory through a debugfs read. q54sj108a2_debugfs_read passes the 34-byte data buffer as bin2hex's destination, so a 32-byte input produces 64 output bytes and overwrites 30 stack bytes. Reachability requires local access to the q54sj108a2 driver's debugfs entry; the resulting corruption can disclose or alter kernel memory or crash the system.

The record

CVE
CVE-2026-43380
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.11
  2. Affected versionversion=d014538aa38561cd24c5eb228223585f26c5ec71 <24a7b9daa103fa963b3fd37d8805b23e01621976
  3. Affected versionversion=d014538aa38561cd24c5eb228223585f26c5ec71 <25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43
  4. Affected versionversion=d014538aa38561cd24c5eb228223585f26c5ec71 <52db5ef163c96f916d424e472fb17aadc35a9f7a
  5. Affected versionversion=d014538aa38561cd24c5eb228223585f26c5ec71 <73a7a345816946d276ad2c46c8bb771de67cfc46
  6. Affected versionversion=d014538aa38561cd24c5eb228223585f26c5ec71 <a0fc1b9c738fba231f190ab960c83202722efee5
  7. Affected versionversion=d014538aa38561cd24c5eb228223585f26c5ec71 <b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b
  8. Affected versionversion=d014538aa38561cd24c5eb228223585f26c5ec71 <c59090c50f62a17129fc4c5407bc4071305a9e82

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.11; version=d014538aa38561cd24c5eb228223585f26c5ec71 <24a7b9daa103fa963b3fd37d8805b23e01621976; version=d014538aa38561cd24c5eb228223585f26c5ec71 <25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43; version=d014538aa38561cd24c5eb228223585f26c5ec71 <52db5ef163c96f916d424e472fb17aadc35a9f7a; version=d014538aa38561cd24c5eb228223585f26c5ec71 <73a7a345816946d276ad2c46c8bb771de67cfc46; version=d014538aa38561cd24c5eb228223585f26c5ec71 <a0fc1b9c738fba231f190ab960c83202722efee5; version=d014538aa38561cd24c5eb228223585f26c5ec71 <b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b; version=d014538aa38561cd24c5eb228223585f26c5ec71 <c59090c50f62a17129fc4c5407bc4071305a9e82

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo