CVE-2022-48855

Local kernel-memory disclosure via uninitialized SCTP diagnostics

Published Jul 16, 2024 · Updated May 11, 2026

Information disclosure in affected Linux kernel releases allows local users to read four uninitialized bytes via SCTP diagnostics. inet_sctp_diag_fill() leaves idiag_expires and related inet_diag response fields uninitialized before Netlink copies the response to userspace. A local account able to query the SCTP socket diagnostic Netlink interface is required, and the reported disclosure is limited to four bytes.

CVSS severity7.1
High
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

Information disclosure in affected Linux kernel releases allows local users to read four uninitialized bytes via SCTP diagnostics. inet_sctp_diag_fill() leaves idiag_expires and related inet_diag response fields uninitialized before Netlink copies the response to userspace. A local account able to query the SCTP socket diagnostic Netlink interface is required, and the reported disclosure is limited to four bytes.

The record

CVE
CVE-2022-48855
Published
Jul 16, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1005
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

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=4.7
  2. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <1502f15b9f29c41883a6139f2923523873282a83
  3. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <2d8fa3fdf4542a2174a72d92018f488d65d848c5
  4. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <3fc0fd724d199e061432b66a8d85b7d48fe485f7
  5. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <41a2864cf719c17294f417726edd411643462ab8
  6. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <633593a808980f82d251d0ca89730d8bb8b0220c
  7. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <b7e4d9ba2ddb78801488b4c623875b81fb46b545
  8. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <bbf59d7ae558940cfa2b36a287fd1e88d83f89f8
  9. Affected versionversion=8f840e47f190cbe61a96945c13e9551048d42cef <d828b0fe6631f3ae8709ac9a10c77c5836c76a08

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.7; version=8f840e47f190cbe61a96945c13e9551048d42cef <1502f15b9f29c41883a6139f2923523873282a83; version=8f840e47f190cbe61a96945c13e9551048d42cef <2d8fa3fdf4542a2174a72d92018f488d65d848c5; version=8f840e47f190cbe61a96945c13e9551048d42cef <3fc0fd724d199e061432b66a8d85b7d48fe485f7; version=8f840e47f190cbe61a96945c13e9551048d42cef <41a2864cf719c17294f417726edd411643462ab8; version=8f840e47f190cbe61a96945c13e9551048d42cef <633593a808980f82d251d0ca89730d8bb8b0220c; version=8f840e47f190cbe61a96945c13e9551048d42cef <b7e4d9ba2ddb78801488b4c623875b81fb46b545; version=8f840e47f190cbe61a96945c13e9551048d42cef <bbf59d7ae558940cfa2b36a287fd1e88d83f89f8; version=8f840e47f190cbe61a96945c13e9551048d42cef <d828b0fe6631f3ae8709ac9a10c77c5836c76a08

Published CVSS scores

7.1NVDCVSS: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-401Missing Release of Memory after Effective Lifetime
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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