CVE-2023-53831

Kernel warning via socket-family race

Published Dec 9, 2025 · Updated May 11, 2026

Race condition in affected Linux kernel branches allows local users to trigger a kernel warning through concurrent socket-family changes. sk_mc_loop() repeatedly read sk->sk_family while IPV6_ADDRFORM could change that field concurrently, letting one call observe inconsistent address families until a single READ_ONCE() access was introduced. Reaching the warning requires local socket operations, IPv6 support, and the affected networking path; the upstream record documents a WARN_ON_ONCE, not privilege escalation or memory corruption.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in affected Linux kernel branches allows local users to trigger a kernel warning through concurrent socket-family changes. sk_mc_loop() repeatedly read sk->sk_family while IPV6_ADDRFORM could change that field concurrently, letting one call observe inconsistent address families until a single READ_ONCE() access was introduced. Reaching the warning requires local socket operations, IPv6 support, and the affected networking path; the upstream record documents a WARN_ON_ONCE, not privilege escalation or memory corruption.

The record

CVE
CVE-2023-53831
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.33
  2. Affected versionversion=7ad6848c7e81a603605fad3f3575841aab004eea <41f10a4d78fe69d685a3172e6884297f233dcf95
  3. Affected versionversion=7ad6848c7e81a603605fad3f3575841aab004eea <7586a66b9c4f1b8a825ea1dfa3a91aad5cc7b89b
  4. Affected versionversion=7ad6848c7e81a603605fad3f3575841aab004eea <895dc4c47171a20035cdaa8d74c1c1e97f2fc974
  5. Affected versionversion=7ad6848c7e81a603605fad3f3575841aab004eea <9036b6342fcdab190d6edce3dd447859c1de90fc
  6. Affected versionversion=7ad6848c7e81a603605fad3f3575841aab004eea <a3e0fdf71bbe031de845e8e08ed7fba49f9c702c
  7. Affected versionversion=7ad6848c7e81a603605fad3f3575841aab004eea <b1f5b890b89cb38a6c0bac91984d56cd69808e8c
  8. Affected versionversion=7ad6848c7e81a603605fad3f3575841aab004eea <e918d0211ffbaf039447334c3460cafee1ce0157
  9. Affected versionversion=7ad6848c7e81a603605fad3f3575841aab004eea <ed4e0adfa407ab65dd73b8862ebf2f308a0349d2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=7ad6848c7e81a603605fad3f3575841aab004eea <41f10a4d78fe69d685a3172e6884297f233dcf95; version=7ad6848c7e81a603605fad3f3575841aab004eea <7586a66b9c4f1b8a825ea1dfa3a91aad5cc7b89b; version=7ad6848c7e81a603605fad3f3575841aab004eea <895dc4c47171a20035cdaa8d74c1c1e97f2fc974; version=7ad6848c7e81a603605fad3f3575841aab004eea <9036b6342fcdab190d6edce3dd447859c1de90fc; version=7ad6848c7e81a603605fad3f3575841aab004eea <a3e0fdf71bbe031de845e8e08ed7fba49f9c702c; version=7ad6848c7e81a603605fad3f3575841aab004eea <b1f5b890b89cb38a6c0bac91984d56cd69808e8c; version=7ad6848c7e81a603605fad3f3575841aab004eea <e918d0211ffbaf039447334c3460cafee1ce0157; version=7ad6848c7e81a603605fad3f3575841aab004eea <ed4e0adfa407ab65dd73b8862ebf2f308a0349d2

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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