CVE-2023-54193

Kernel memory corruption via stale traffic-control callback

Published Dec 30, 2025 · Updated Dec 30, 2025

Use-after-free in the Linux kernel 5.3 through 6.3 allows local users to corrupt kernel memory through tc qdisc configuration. The tcf_block_bind error path frees callback objects after ndo_setup_tc has linked them into driver_list, leaving dangling entries that flow_block_cb_setup_simple later dereferences. Low-privilege local access with CAP_NET_ADMIN obtainable in a new network namespace is sufficient; exploitation can disclose or modify kernel memory or panic the system.

CVSS severity7.8
High
EPSS probability0.16%
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 5.3 through 6.3 allows local users to corrupt kernel memory through tc qdisc configuration. The tcf_block_bind error path frees callback objects after ndo_setup_tc has linked them into driver_list, leaving dangling entries that flow_block_cb_setup_simple later dereferences. Low-privilege local access with CAP_NET_ADMIN obtainable in a new network namespace is sufficient; exploitation can disclose or modify kernel memory or panic the system.

The record

CVE
CVE-2023-54193
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=5.3
  2. Affected versionversion=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <26aec72429a05e917d574eca0efc5306c63a8862
  3. Affected versionversion=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <55866fe3fded3ce94ac3fc1bb3dfce654282f483
  4. Affected versionversion=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <7311c8be3755611bf6edea4dfbeb190b4bdd489f
  5. Affected versionversion=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <7b7a74ed303d532fb73ae4b1697f16a0fea89cd0
  6. Affected versionversion=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <cb145932fcf6814e7e95e467eb70e7849a845ae9
  7. Affected versionversion=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <cc5fe387c6294d0471cb7ed064efac97fac65ccc
  8. Affected versionversion=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <da94a7781fc3c92e7df7832bc2746f4d39bc624e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <26aec72429a05e917d574eca0efc5306c63a8862; version=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <55866fe3fded3ce94ac3fc1bb3dfce654282f483; version=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <7311c8be3755611bf6edea4dfbeb190b4bdd489f; version=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <7b7a74ed303d532fb73ae4b1697f16a0fea89cd0; version=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <cb145932fcf6814e7e95e467eb70e7849a845ae9; version=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <cc5fe387c6294d0471cb7ed064efac97fac65ccc; version=59094b1e5094c7e50a3d2912202fd30b6a1dadf8 <da94a7781fc3c92e7df7832bc2746f4d39bc624e

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 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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