CVE-2023-53595

Kernel crash via misordered MACsec teardown

Published Oct 4, 2025 · Updated Oct 4, 2025

NULL pointer dereferences in Linux kernel 6.1 through 6.1.28, 6.2 through 6.2.15, and 6.3 through 6.3.2 allow local users to crash the kernel. During otx2_remove(), MACsec stop and security-association deletion callbacks access driver state after the OcteonTX2 PF MCS teardown has invalidated it. The host must use the OcteonTX2 PF MCS driver, have a MACsec interface configured, and enter reboot; the resulting crash interrupts service without reported data exposure or modification.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereferences in Linux kernel 6.1 through 6.1.28, 6.2 through 6.2.15, and 6.3 through 6.3.2 allow local users to crash the kernel. During otx2_remove(), MACsec stop and security-association deletion callbacks access driver state after the OcteonTX2 PF MCS teardown has invalidated it. The host must use the OcteonTX2 PF MCS driver, have a MACsec interface configured, and enter reboot; the resulting crash interrupts service without reported data exposure or modification.

The record

CVE
CVE-2023-53595
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1529
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 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=6.1
  2. Affected versionversion=c54ffc73601c0a239e55911923a6e23a2a74f143 <1152c0f947b76e7731e039185cbd00fdb4389f00
  3. Affected versionversion=c54ffc73601c0a239e55911923a6e23a2a74f143 <13ff119b17e5e2916435ce01a0156c8698ad9e16
  4. Affected versionversion=c54ffc73601c0a239e55911923a6e23a2a74f143 <699af748c61574125d269db260dabbe20436d74e
  5. Affected versionversion=c54ffc73601c0a239e55911923a6e23a2a74f143 <a3dcc45eca017fca82ac47dbde6f41af960657e5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=c54ffc73601c0a239e55911923a6e23a2a74f143 <1152c0f947b76e7731e039185cbd00fdb4389f00; version=c54ffc73601c0a239e55911923a6e23a2a74f143 <13ff119b17e5e2916435ce01a0156c8698ad9e16; version=c54ffc73601c0a239e55911923a6e23a2a74f143 <699af748c61574125d269db260dabbe20436d74e; version=c54ffc73601c0a239e55911923a6e23a2a74f143 <a3dcc45eca017fca82ac47dbde6f41af960657e5

Published CVSS scores

5.5Canonical UbuntuCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1529System Shutdown/Reboot

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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