CVE-2022-48757

Cross-namespace packet-socket disclosure via unfiltered proc output

Published Jun 20, 2024 · Updated May 11, 2026

Information disclosure in the Linux kernel allows local users to observe packet-socket registrations across network namespaces. The ptype_seq_show function renders packet_type entries in /proc/net/ptype without filtering them by their owning network namespace. A local user who can read the proc file can learn that another namespace created an unbound packet socket, but the disclosed entry does not expose packet contents.

CVSS severity7.1
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel allows local users to observe packet-socket registrations across network namespaces. The ptype_seq_show function renders packet_type entries in /proc/net/ptype without filtering them by their owning network namespace. A local user who can read the proc file can learn that another namespace created an unbound packet socket, but the disclosed entry does not expose packet contents.

The record

CVE
CVE-2022-48757
Published
Jun 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-668, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 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=2.6.26
  2. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <47934e06b65637c88a762d9c98329ae6e3238888
  3. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <839ec7039513a4f84bfbaff953a9393471176bee
  4. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <8f88c78d24f6f346919007cd459fd7e51a8c7779
  5. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <b67ad6170c0ea87391bb253f35d1f78857736e54
  6. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <be1ca30331c7923c6f376610c1bd6059be9b1908
  7. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <c38023032a598ec6263e008d62c7f02def72d5c7
  8. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <db044d97460ea792110eb8b971e82569ded536c6
  9. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <e372ecd455b6ebc7720f52bf4b5f5d44d02f2092
  10. Affected versionversion=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <e43669c77cb3a742b7d84ecdc7c68c4167a7709b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.26; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <47934e06b65637c88a762d9c98329ae6e3238888; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <839ec7039513a4f84bfbaff953a9393471176bee; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <8f88c78d24f6f346919007cd459fd7e51a8c7779; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <b67ad6170c0ea87391bb253f35d1f78857736e54; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <be1ca30331c7923c6f376610c1bd6059be9b1908; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <c38023032a598ec6263e008d62c7f02def72d5c7; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <db044d97460ea792110eb8b971e82569ded536c6; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <e372ecd455b6ebc7720f52bf4b5f5d44d02f2092; version=2feb27dbe00cbb4f7d31f90acf6bd0d751dd0a50 <e43669c77cb3a742b7d84ecdc7c68c4167a7709b

Published CVSS scores

7.1NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

CWE-668Exposure of Resource to Wrong Sphere
T1005Data from Local System

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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