CVE-2023-53333Network attack vector

Remote kernel crash via undersized DCCP header copy

Published Sep 16, 2025 · Updated Aug 5, 2026

Out-of-bounds reads in Linux DCCP connection tracking allow remote attackers to crash affected kernels with crafted DCCP packets. nf_conntrack_dccp_packet copies only the 12-byte basic header into _dh, then dccp_ack_seq reads sequence data beyond that stack buffer. Reachability requires active DCCP conntrack hooks; crafted traffic can disclose a small bounded stack value or trigger a kernel crash.

CVSS severity8.2
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in Linux DCCP connection tracking allow remote attackers to crash affected kernels with crafted DCCP packets. nf_conntrack_dccp_packet copies only the 12-byte basic header into _dh, then dccp_ack_seq reads sequence data beyond that stack buffer. Reachability requires active DCCP conntrack hooks; crafted traffic can disclose a small bounded stack value or trigger a kernel crash.

The record

CVE
CVE-2023-53333
Published
Sep 16, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.26
  2. Affected versionversion=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <26bd1f210d3783a691052c51d76bb8a8bbd24c67
  3. Affected versionversion=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <337fdce450637ea663bc816edc2ba81e5cdad02e
  4. Affected versionversion=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <5c618daa5038712c4a4ef8923905a2ea1b8836a1
  5. Affected versionversion=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <8c0980493beed3a80d6329c44ab293dc8c032927
  6. Affected versionversion=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8
  7. Affected versionversion=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <c052797ac36813419ad3bfa54cb8615db4b41f15
  8. Affected versionversion=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.26; version=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <26bd1f210d3783a691052c51d76bb8a8bbd24c67; version=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <337fdce450637ea663bc816edc2ba81e5cdad02e; version=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <5c618daa5038712c4a4ef8923905a2ea1b8836a1; version=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <8c0980493beed3a80d6329c44ab293dc8c032927; version=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8; version=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <c052797ac36813419ad3bfa54cb8615db4b41f15; version=2bc780499aa33311ec0f3e42624dfaa7be0ade5e <ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.2kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
7.1CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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