CVE-2022-50865Network attack vector

TCP connection interruption via overflowed backlog limit

Published Dec 30, 2025 · Updated Dec 30, 2025

Integer overflow in affected Linux kernel releases allows remote attackers to interrupt TCP connections via inbound segments. The tcp_add_backlog() limit adds signed receive and send buffer sizes plus 64 KiB; overflow produces a tiny unsigned backlog threshold that drops packets prematurely. Reachability requires an established TCP connection and unusually large configured socket-buffer ceilings, but no attacker authentication or local access.

CVSS severity7.5
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in affected Linux kernel releases allows remote attackers to interrupt TCP connections via inbound segments. The tcp_add_backlog() limit adds signed receive and send buffer sizes plus 64 KiB; overflow produces a tiny unsigned backlog threshold that drops packets prematurely. Reachability requires an established TCP connection and unusually large configured socket-buffer ceilings, but no attacker authentication or local access.

The record

CVE
CVE-2022-50865
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

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=4.9
  2. Affected versionversion=c9c3321257e1b95be9b375f811fb250162af8d39 <28addf029417d53b1df062b4c87feb7bc033cb5f
  3. Affected versionversion=c9c3321257e1b95be9b375f811fb250162af8d39 <4f23cb2be530785db284a685d1b1c30224d8a538
  4. Affected versionversion=c9c3321257e1b95be9b375f811fb250162af8d39 <9d04b4d0feee12bce6bfe37f30d8e953d3c30368
  5. Affected versionversion=c9c3321257e1b95be9b375f811fb250162af8d39 <a85d39f14aa8a71e29cfb5eb5de02878a8779898
  6. Affected versionversion=c9c3321257e1b95be9b375f811fb250162af8d39 <ec791d8149ff60c40ad2074af3b92a39c916a03f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.9; version=c9c3321257e1b95be9b375f811fb250162af8d39 <28addf029417d53b1df062b4c87feb7bc033cb5f; version=c9c3321257e1b95be9b375f811fb250162af8d39 <4f23cb2be530785db284a685d1b1c30224d8a538; version=c9c3321257e1b95be9b375f811fb250162af8d39 <9d04b4d0feee12bce6bfe37f30d8e953d3c30368; version=c9c3321257e1b95be9b375f811fb250162af8d39 <a85d39f14aa8a71e29cfb5eb5de02878a8779898; version=c9c3321257e1b95be9b375f811fb250162af8d39 <ec791d8149ff60c40ad2074af3b92a39c916a03f

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5OracleCVSS: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.

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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

T1499.004Application 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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