CVE-2023-52637

Local privilege escalation via J1939 filter race

Published Apr 3, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel J1939 socket filter subsystem allows local users to gain kernel privileges via a concurrent race. The j1939_sk_setsockopt path frees or replaces jsk->filters while receive-side matching reads the same array without holding the socket lock. An unprivileged local user with access to an active CAN or virtual CAN interface can race filter replacement against packet reception, enabling kernel memory disclosure, modification, or a crash.

CVSS severity7.8
High
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

Use-after-free in the Linux kernel J1939 socket filter subsystem allows local users to gain kernel privileges via a concurrent race. The j1939_sk_setsockopt path frees or replaces jsk->filters while receive-side matching reads the same array without holding the socket lock. An unprivileged local user with access to an active CAN or virtual CAN interface can race filter replacement against packet reception, enabling kernel memory disclosure, modification, or a crash.

The record

CVE
CVE-2023-52637
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.4
  2. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <08de58abedf6e69396e1207e4f99ef8904b2b532
  3. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <41ccb5bcbf03f02d820bc6ea8390811859f558f8
  4. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <4dd684d4bb3cd5454e0bf6e2a1bdfbd5c9c872ed
  5. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <978e50ef8c38dc71bd14d1b0143d554ff5d188ba
  6. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <efe7cf828039aedb297c1f9920b638fffee6aabc
  7. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <f84e7534457dcd7835be743517c35378bb4e7c50
  8. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <fc74b9cb789cae061bbca7b203a3842e059f6b5d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=9d71dd0c70099914fcd063135da3c580865e924c <08de58abedf6e69396e1207e4f99ef8904b2b532; version=9d71dd0c70099914fcd063135da3c580865e924c <41ccb5bcbf03f02d820bc6ea8390811859f558f8; version=9d71dd0c70099914fcd063135da3c580865e924c <4dd684d4bb3cd5454e0bf6e2a1bdfbd5c9c872ed; version=9d71dd0c70099914fcd063135da3c580865e924c <978e50ef8c38dc71bd14d1b0143d554ff5d188ba; version=9d71dd0c70099914fcd063135da3c580865e924c <efe7cf828039aedb297c1f9920b638fffee6aabc; version=9d71dd0c70099914fcd063135da3c580865e924c <f84e7534457dcd7835be743517c35378bb4e7c50; version=9d71dd0c70099914fcd063135da3c580865e924c <fc74b9cb789cae061bbca7b203a3842e059f6b5d

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-416Use After Free
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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