CVE-2023-54312

BPF sample interruption via oversized comparison

Published Dec 30, 2025 · Updated Dec 30, 2025

An out-of-bounds read in the tcp_basertt BPF sample in Linux allows local users to interrupt the sample through IPv6 socket activity. Its BPF_SOCK_OPS_BASE_RTT handler asks __builtin_memcmp to compare sizeof(nv)+1 bytes against the three-byte nv string, reading one byte past that stack object. Reachability requires the optional sample to be built and attached to a cgroup; the normal kernel networking path does not invoke it by default.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in the tcp_basertt BPF sample in Linux allows local users to interrupt the sample through IPv6 socket activity. Its BPF_SOCK_OPS_BASE_RTT handler asks __builtin_memcmp to compare sizeof(nv)+1 bytes against the three-byte nv string, reading one byte past that stack object. Reachability requires the optional sample to be built and attached to a cgroup; the normal kernel networking path does not invoke it by default.

The record

CVE
CVE-2023-54312
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=4.15
  2. Affected versionversion=c890063e440456e75c2e70f6bcec3797f1771eb6 <56c25f2763a16db4fa1b486e6a21dc246cd992bd
  3. Affected versionversion=c890063e440456e75c2e70f6bcec3797f1771eb6 <7c08d1b0d1f75117cf82aeaef49ba9f861b3fb59
  4. Affected versionversion=c890063e440456e75c2e70f6bcec3797f1771eb6 <bd3e880dce27d225598730d2bbb3dc05b443af22
  5. Affected versionversion=c890063e440456e75c2e70f6bcec3797f1771eb6 <cf7514fedc25675e68b74941df28a883951e70fd
  6. Affected versionversion=c890063e440456e75c2e70f6bcec3797f1771eb6 <dfc004688518d24159606289c74d0c4e123e6436
  7. Affected versionversion=c890063e440456e75c2e70f6bcec3797f1771eb6 <e92f61e0701ea780e57e1be8dbd1fbec5f42c09e
  8. Affected versionversion=c890063e440456e75c2e70f6bcec3797f1771eb6 <f394d204d64095d72ad9f03ff98f3f3743bf743a
  9. Affected versionversion=c890063e440456e75c2e70f6bcec3797f1771eb6 <f4dea9689c5fea3d07170c2cb0703e216f1a0922

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=c890063e440456e75c2e70f6bcec3797f1771eb6 <56c25f2763a16db4fa1b486e6a21dc246cd992bd; version=c890063e440456e75c2e70f6bcec3797f1771eb6 <7c08d1b0d1f75117cf82aeaef49ba9f861b3fb59; version=c890063e440456e75c2e70f6bcec3797f1771eb6 <bd3e880dce27d225598730d2bbb3dc05b443af22; version=c890063e440456e75c2e70f6bcec3797f1771eb6 <cf7514fedc25675e68b74941df28a883951e70fd; version=c890063e440456e75c2e70f6bcec3797f1771eb6 <dfc004688518d24159606289c74d0c4e123e6436; version=c890063e440456e75c2e70f6bcec3797f1771eb6 <e92f61e0701ea780e57e1be8dbd1fbec5f42c09e; version=c890063e440456e75c2e70f6bcec3797f1771eb6 <f394d204d64095d72ad9f03ff98f3f3743bf743a; version=c890063e440456e75c2e70f6bcec3797f1771eb6 <f4dea9689c5fea3d07170c2cb0703e216f1a0922

Published CVSS scores

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

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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