CVE-2022-48819

Local service interruption via inconsistent TCP zero-copy accounting

Published Jul 16, 2024 · Updated May 11, 2026

TCP accounting flaw in Linux 5.16 through 5.16.9 allows local users to interrupt service via mixed zero-copy socket sends. The sendpage path fails to downgrade a pure zero-copy skb when it gains pipe-backed data, leaving sk_forward_alloc out of sync. A low-privileged local process must mix splice or sendpage with MSG_ZEROCOPY on one TCP socket; the documented result is a kernel warning and availability loss.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TCP accounting flaw in Linux 5.16 through 5.16.9 allows local users to interrupt service via mixed zero-copy socket sends. The sendpage path fails to downgrade a pure zero-copy skb when it gains pipe-backed data, leaving sk_forward_alloc out of sync. A low-privileged local process must mix splice or sendpage with MSG_ZEROCOPY on one TCP socket; the documented result is a kernel warning and availability loss.

The record

CVE
CVE-2022-48819
Published
Jul 16, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.16
  2. Affected versionversion=9b65b17db72313b7a4fe9bc9502928c88be57986 <47f3860c4931175f112f28dcac66eacca9b1040f
  3. Affected versionversion=9b65b17db72313b7a4fe9bc9502928c88be57986 <f8d9d938514f46c4892aff6bfe32f425e84d81cc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=9b65b17db72313b7a4fe9bc9502928c88be57986 <47f3860c4931175f112f28dcac66eacca9b1040f; version=9b65b17db72313b7a4fe9bc9502928c88be57986 <f8d9d938514f46c4892aff6bfe32f425e84d81cc

Published CVSS scores

5.5NIST NVDCVSS: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

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 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

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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