CVE-2023-54306Network attack vector

Remote service interruption via zero-window tx_lock stall

Published Dec 30, 2025 · Updated Dec 30, 2025

Denial of service in Linux kernel 5.4 through 6.2 allows remote attackers to hang kTLS transmitters via a zero TCP receive window. In net/tls/tls_sw.c, a sending thread sleeps while holding tx_lock when the peer advertises no receive window, preventing other transmitters from acquiring the lock for hours. A network peer only needs to stop reading from a kTLS socket; the bounded consequence is a prolonged service interrupt for work sharing that transmit lock.

CVSS severity7.5
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 5.4 through 6.2 allows remote attackers to hang kTLS transmitters via a zero TCP receive window. In net/tls/tls_sw.c, a sending thread sleeps while holding tx_lock when the peer advertises no receive window, preventing other transmitters from acquiring the lock for hours. A network peer only needs to stop reading from a kTLS socket; the bounded consequence is a prolonged service interrupt for work sharing that transmit lock.

The record

CVE
CVE-2023-54306
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

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=5.4
  2. Affected versionversion=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <1f800f6aae57d2d8f63d32fff383017cbc11cf65
  3. Affected versionversion=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <7123a4337bf73132bbfb5437e4dc83ba864a9a1e
  4. Affected versionversion=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <bde541a57b4204d0a800afbbd3d1c06c9cdb133f
  5. Affected versionversion=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <be5d5d0637fd88c18ee76024bdb22649a1de00d6
  6. Affected versionversion=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <ccf1ccdc5926907befbe880b562b2a4b5f44c087
  7. Affected versionversion=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <f3221361dc85d4de22586ce8441ec2c67b454f5d
  8. Affected versionversion=c8d6817345f4ba228d07380e571676405e112872

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <1f800f6aae57d2d8f63d32fff383017cbc11cf65; version=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <7123a4337bf73132bbfb5437e4dc83ba864a9a1e; version=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <bde541a57b4204d0a800afbbd3d1c06c9cdb133f; version=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <be5d5d0637fd88c18ee76024bdb22649a1de00d6; version=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <ccf1ccdc5926907befbe880b562b2a4b5f44c087; version=79ffe6087e9145d2377385cac48d0d6a6b4225a5 <f3221361dc85d4de22586ce8441ec2c67b454f5d; version=c8d6817345f4ba228d07380e571676405e112872

Published CVSS scores

7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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