CVE-2023-54186

Kernel memory corruption via negative buffer index

Published Dec 30, 2025 · Updated Dec 30, 2025

Out-of-bounds write in the USB-C DisplayPort Alt Mode handler in Linux 4.19 through 6.3.3 allows local users to corrupt kernel memory. When get_current_pin_assignments returns zero, pin_assignment_show leaves len at zero and writes a newline to buf[len - 1], before the output buffer. Triggering the defect requires a local read of the pin_assignment sysfs attribute while the attached partner offers no compatible assignment; the demonstrated result is a KASAN-detected kernel memory fault.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the USB-C DisplayPort Alt Mode handler in Linux 4.19 through 6.3.3 allows local users to corrupt kernel memory. When get_current_pin_assignments returns zero, pin_assignment_show leaves len at zero and writes a newline to buf[len - 1], before the output buffer. Triggering the defect requires a local read of the pin_assignment sysfs attribute while the attached partner offers no compatible assignment; the demonstrated result is a KASAN-detected kernel memory fault.

The record

CVE
CVE-2023-54186
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record 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=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <08bd1be1c716fd50a7df48f82dcbc59a103082b5
  2. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <0e61a7432fcd4bca06f05b7f1c7d7cb461880fe2
  3. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <4f9c0a7c272626cb6716ffc7800e8c73260cdce6
  4. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <54ee23e4ab263a495ace1eed43d3883212ece17f
  5. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <d8f28269dd4bf9b55c3fb376ae31512730a96fce
  6. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <fc0e18f95c88435bd8a1ceb540243cd7fbcd9781
  7. Affected versionversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <ff466f77d0a56719979c4234abd412abd98eae8f
  8. Affected versionversion=4.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <08bd1be1c716fd50a7df48f82dcbc59a103082b5; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <0e61a7432fcd4bca06f05b7f1c7d7cb461880fe2; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <4f9c0a7c272626cb6716ffc7800e8c73260cdce6; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <54ee23e4ab263a495ace1eed43d3883212ece17f; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <d8f28269dd4bf9b55c3fb376ae31512730a96fce; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <fc0e18f95c88435bd8a1ceb540243cd7fbcd9781; version=0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 <ff466f77d0a56719979c4234abd412abd98eae8f; version=4.19

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5Amazon LinuxCVSS: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

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

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Your stack

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