CVE-2022-50536

Host crash via repeated TCP socket release

Published Oct 7, 2025 · Updated Oct 7, 2025

Double release in Linux kernel BPF sockmap code allows local users to crash the host through a continued redirected message. In tcp_bpf_send_verdict(), an uncleared __SK_REDIRECT verdict makes the more_data loop call sock_put() repeatedly for the same TCP socket, causing a use-after-free. Exploitation requires CAP_BPF or CAP_SYS_ADMIN in the initial user namespace to create the sockmap and load its BPF program.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double release in Linux kernel BPF sockmap code allows local users to crash the host through a continued redirected message. In tcp_bpf_send_verdict(), an uncleared __SK_REDIRECT verdict makes the more_data loop call sock_put() repeatedly for the same TCP socket, causing a use-after-free. Exploitation requires CAP_BPF or CAP_SYS_ADMIN in the initial user namespace to create the sockmap and load its BPF program.

The record

CVE
CVE-2022-50536
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1341, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=15dec6d8f8642a26d6a272af2d7f9877df8f02b8 <28e4a763cd4a2b1a78852216ef4bd7df3a05cec6
  2. Affected versionversion=5.15
  3. Affected versionversion=5f0bfe21c853917aae4bc5a70fe57ddb4054443e <7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10
  4. Affected versionversion=6f226ffe4458ea3b8c33287cb8c86f87dc198dce
  5. Affected versionversion=cd9733f5d75c94a32544d6ce5be47e14194cf137 <113236e8f49f262f318c00ebb14b15f4834e87c1
  6. Affected versionversion=cd9733f5d75c94a32544d6ce5be47e14194cf137 <578a7628b838a3ac8ad61deaab5a816ff032ac13
  7. Affected versionversion=cd9733f5d75c94a32544d6ce5be47e14194cf137 <7a9841ca025275b5b0edfb0b618934abb6ceec15
  8. Affected versionversion=cd9733f5d75c94a32544d6ce5be47e14194cf137 <8786bde11a4f31b63b3036731df0b47337a7a245

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=15dec6d8f8642a26d6a272af2d7f9877df8f02b8 <28e4a763cd4a2b1a78852216ef4bd7df3a05cec6; version=5.15; version=5f0bfe21c853917aae4bc5a70fe57ddb4054443e <7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10; version=6f226ffe4458ea3b8c33287cb8c86f87dc198dce; version=cd9733f5d75c94a32544d6ce5be47e14194cf137 <113236e8f49f262f318c00ebb14b15f4834e87c1; version=cd9733f5d75c94a32544d6ce5be47e14194cf137 <578a7628b838a3ac8ad61deaab5a816ff032ac13; version=cd9733f5d75c94a32544d6ce5be47e14194cf137 <7a9841ca025275b5b0edfb0b618934abb6ceec15; version=cd9733f5d75c94a32544d6ce5be47e14194cf137 <8786bde11a4f31b63b3036731df0b47337a7a245

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1341Multiple Releases of Same Resource or Handle
T1499.004Application or System Exploitation

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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