CVE-2022-48639

Service interruption via traffic-control refcount leak

Published Apr 28, 2024 · Updated May 11, 2026

Resource leak in the Linux kernel allows local users to interrupt service through crafted traffic-control filter replacement requests. The tc_new_tfilter() path retains the reference returned by tp->ops->get when template and filter operations differ because it omits tfilter_put(). Local low-privileged access and the mismatched template-chain path are required; repeated requests consume unreleased references and can interrupt service.

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

Resource leak in the Linux kernel allows local users to interrupt service through crafted traffic-control filter replacement requests. The tc_new_tfilter() path retains the reference returned by tp->ops->get when template and filter operations differ because it omits tfilter_put(). Local low-privileged access and the mismatched template-chain path are required; repeated requests consume unreleased references and can interrupt service.

The record

CVE
CVE-2022-48639
Published
Apr 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 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=5.1
  2. Affected versionversion=7d5509fa0d3ddfe252b4418513e493ac98de3317 <0559d91ee3a2cd81b15ad5cd507539d6da867f88
  3. Affected versionversion=7d5509fa0d3ddfe252b4418513e493ac98de3317 <8844c750eeb03452e2b3319c27a526f447b82596
  4. Affected versionversion=7d5509fa0d3ddfe252b4418513e493ac98de3317 <903f7d322c17d8e306d766404b4604e81653902a
  5. Affected versionversion=7d5509fa0d3ddfe252b4418513e493ac98de3317 <c2e1cfefcac35e0eea229e148c8284088ce437b5
  6. Affected versionversion=7d5509fa0d3ddfe252b4418513e493ac98de3317 <f8162aed962be8fa07445b2b5928e84ab40dd8d7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=7d5509fa0d3ddfe252b4418513e493ac98de3317 <0559d91ee3a2cd81b15ad5cd507539d6da867f88; version=7d5509fa0d3ddfe252b4418513e493ac98de3317 <8844c750eeb03452e2b3319c27a526f447b82596; version=7d5509fa0d3ddfe252b4418513e493ac98de3317 <903f7d322c17d8e306d766404b4604e81653902a; version=7d5509fa0d3ddfe252b4418513e493ac98de3317 <c2e1cfefcac35e0eea229e148c8284088ce437b5; version=7d5509fa0d3ddfe252b4418513e493ac98de3317 <f8162aed962be8fa07445b2b5928e84ab40dd8d7

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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