CVE-2022-49865

Kernel memory disclosure via uninitialized address-label field

Published May 1, 2025 · Updated May 11, 2026

Information disclosure in the Linux kernel IPv6 address-label code allows local users to read one byte of kernel memory through a netlink reply. The ip6addrlbl_get path copies struct ifaddrlblmsg without initializing its __ifal_reserved field, placing stale kernel data in the reply. The path requires low-privileged local access to request address-label data, and each affected reply discloses one byte.

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 IPv6 address-label code allows local users to read one byte of kernel memory through a netlink reply. The ip6addrlbl_get path copies struct ifaddrlblmsg without initializing its __ifal_reserved field, placing stale kernel data in the reply. The path requires low-privileged local access to request address-label data, and each affected reply discloses one byte.

The record

CVE
CVE-2022-49865
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-909
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE 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=2.6.25
  2. Affected versionversion=2a8cc6c89039e0530a3335954253b76ed0f9339a <0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf
  3. Affected versionversion=2a8cc6c89039e0530a3335954253b76ed0f9339a <2acb2779b147decd300c117683d5a32ce61c75d6
  4. Affected versionversion=2a8cc6c89039e0530a3335954253b76ed0f9339a <49e92ba5ecd7d72ba369dde2ccff738edd028a47
  5. Affected versionversion=2a8cc6c89039e0530a3335954253b76ed0f9339a <568a47ff756f913e8b374c2af9d22cd2c772c744
  6. Affected versionversion=2a8cc6c89039e0530a3335954253b76ed0f9339a <58cd7fdc8c1e6c7873acc08f190069fed88d1c12
  7. Affected versionversion=2a8cc6c89039e0530a3335954253b76ed0f9339a <6d26d0587abccb9835382a0b53faa7b9b1cd83e3
  8. Affected versionversion=2a8cc6c89039e0530a3335954253b76ed0f9339a <a033b86c7f7621fde31f0364af8986f43b44914f
  9. Affected versionversion=2a8cc6c89039e0530a3335954253b76ed0f9339a <c23fb2c82267638f9d206cb96bb93e1f93ad7828

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.25; version=2a8cc6c89039e0530a3335954253b76ed0f9339a <0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf; version=2a8cc6c89039e0530a3335954253b76ed0f9339a <2acb2779b147decd300c117683d5a32ce61c75d6; version=2a8cc6c89039e0530a3335954253b76ed0f9339a <49e92ba5ecd7d72ba369dde2ccff738edd028a47; version=2a8cc6c89039e0530a3335954253b76ed0f9339a <568a47ff756f913e8b374c2af9d22cd2c772c744; version=2a8cc6c89039e0530a3335954253b76ed0f9339a <58cd7fdc8c1e6c7873acc08f190069fed88d1c12; version=2a8cc6c89039e0530a3335954253b76ed0f9339a <6d26d0587abccb9835382a0b53faa7b9b1cd83e3; version=2a8cc6c89039e0530a3335954253b76ed0f9339a <a033b86c7f7621fde31f0364af8986f43b44914f; version=2a8cc6c89039e0530a3335954253b76ed0f9339a <c23fb2c82267638f9d206cb96bb93e1f93ad7828

Published CVSS scores

7.1NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-909Missing Initialization of Resource

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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