CVE-2024-53206Network attack vector

Remote kernel memory corruption via wrong request release

Published Dec 27, 2024 · Updated Aug 5, 2026

Use-after-free in TCP request handling in affected Linux kernel releases allows remote attackers to corrupt kernel memory via handshake timing. In reqsk_timer_handler(), a failed retry after request-socket migration passes the new req pointer instead of the original oreq pointer to reqsk_put(), prematurely releasing the migrated object. Exploitation requires an open TCP listener using SO_REUSEPORT with tcp_migrate_req enabled; a remote peer can withhold or race the final ACK to trigger disclosure, memory corruption, or a kernel panic.

CVSS severity9.8
Critical
EPSS probability0.63%
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 TCP request handling in affected Linux kernel releases allows remote attackers to corrupt kernel memory via handshake timing. In reqsk_timer_handler(), a failed retry after request-socket migration passes the new req pointer instead of the original oreq pointer to reqsk_put(), prematurely releasing the migrated object. Exploitation requires an open TCP listener using SO_REUSEPORT with tcp_migrate_req enabled; a remote peer can withhold or race the final ACK to trigger disclosure, memory corruption, or a kernel panic.

The record

CVE
CVE-2024-53206
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 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

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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=106e457953315e476b3642ef24be25ed862aaba3
  2. Affected versionversion=5071beb59ee416e8ab456ac8647a4dabcda823b1 <9a3c1ad93e6fba67b3a637cfa95a57a6685e4908
  3. Affected versionversion=5.10.237 <5.11
  4. Affected versionversion=5.15.170 <5.15.174
  5. Affected versionversion=51e34db64f4e43c7b055ccf881b7f3e0c31bb26d <d0eb14cb8c08b00c36a3d5dc57a6f428b301f721
  6. Affected versionversion=5.4.293 <5.5
  7. Affected versionversion=6.1.115 <6.1.120
  8. Affected versionversion=6.11.6 <6.11.11
  9. Affected versionversion=6.12
  10. Affected versionversion=6.6.59 <6.6.64
  11. Affected versionversion=8459d61fbf24967839a70235165673148c7c7f17 <2dcc86fefe09ac853158afd96b60d544af115dc5
  12. Affected versionversion=997ae8da14f1639ce6fb66a063dab54031cd61b3 <65ed89cad1f57034c256b016e89e8c0a4ec7c65b
  13. Affected versionversion=c964bf65f80a14288d767023a1b300b30f5b9cd0
  14. Affected versionversion=e8c526f2bdf1845bedaf6a478816a3d06fa78b8f <6d845028609a4af0ad66f499ee0bd5789122b067
  15. Affected versionversion=e8c526f2bdf1845bedaf6a478816a3d06fa78b8f <c31e72d021db2714df03df6c42855a1db592716c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=106e457953315e476b3642ef24be25ed862aaba3; version=5071beb59ee416e8ab456ac8647a4dabcda823b1 <9a3c1ad93e6fba67b3a637cfa95a57a6685e4908; version=5.10.237 <5.11; version=5.15.170 <5.15.174; version=51e34db64f4e43c7b055ccf881b7f3e0c31bb26d <d0eb14cb8c08b00c36a3d5dc57a6f428b301f721; version=5.4.293 <5.5; version=6.1.115 <6.1.120; version=6.11.6 <6.11.11; version=6.12; version=6.6.59 <6.6.64; version=8459d61fbf24967839a70235165673148c7c7f17 <2dcc86fefe09ac853158afd96b60d544af115dc5; version=997ae8da14f1639ce6fb66a063dab54031cd61b3 <65ed89cad1f57034c256b016e89e8c0a4ec7c65b; version=c964bf65f80a14288d767023a1b300b30f5b9cd0; version=e8c526f2bdf1845bedaf6a478816a3d06fa78b8f <6d845028609a4af0ad66f499ee0bd5789122b067; version=e8c526f2bdf1845bedaf6a478816a3d06fa78b8f <c31e72d021db2714df03df6c42855a1db592716c

Published CVSS scores

7.5OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
9.8Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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 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-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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