CVE-2023-52610Network attack vector

Remote denial of service via leaked fragment references

Published Mar 18, 2024 · Updated Aug 5, 2026

Denial of service in Linux kernel act_ct allows remote attackers to crash hosts or exhaust memory with out-of-order IP fragments. Before defragmentation, act_ct increments skb->users; when fragments arrive out of order, no path releases the last fragment, leaking every fragment. The ingress path must already use act_ct, and the crash additionally requires a cloned, shared skb, as occurs with packet capture or typical act_ct and mirred pipelines.

CVSS severity7.5
High
EPSS probability0.64%
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 act_ct allows remote attackers to crash hosts or exhaust memory with out-of-order IP fragments. Before defragmentation, act_ct increments skb->users; when fragments arrive out of order, no path releases the last fragment, leaking every fragment. The ingress path must already use act_ct, and the crash additionally requires a cloned, shared skb, as occurs with packet capture or typical act_ct and mirred pipelines.

The record

CVE
CVE-2023-52610
Published
Mar 18, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2024CVE 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=5.3
  2. Affected versionversion=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <0b5b831122fc3789fff75be433ba3e4dd7b779d4
  3. Affected versionversion=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <172ba7d46c202e679f3ccb10264c67416aaeb1c4
  4. Affected versionversion=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <3f14b377d01d8357eba032b4cabc8c1149b458b6
  5. Affected versionversion=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <73f7da5fd124f2cda9161e2e46114915e6e82e97
  6. Affected versionversion=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <f5346df0591d10bc948761ca854b1fae6d2ef441

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <0b5b831122fc3789fff75be433ba3e4dd7b779d4; version=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <172ba7d46c202e679f3ccb10264c67416aaeb1c4; version=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <3f14b377d01d8357eba032b4cabc8c1149b458b6; version=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <73f7da5fd124f2cda9161e2e46114915e6e82e97; version=b57dc7c13ea90e09ae15f821d2583fa0231b4935 <f5346df0591d10bc948761ca854b1fae6d2ef441

Published CVSS scores

6.4Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
7.5Linux CNACVSS: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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

T1499Endpoint Denial of Service

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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