CVE-2024-56663

Kernel memory disclosure and corruption via link-ID validation

Published Dec 27, 2024 · Updated Aug 5, 2026

An off-by-one error in Linux kernel nl80211 allows local users to disclose or corrupt kernel memory via a crafted MLO link ID. The NL80211_ATTR_MLO_LINK_ID policy accepts IEEE80211_MLD_MAX_NUM_LINKS because netlink range validation is inclusive, then mac80211 indexes link arrays beyond their valid last element. Reaching the flaw requires CAP_NET_ADMIN in the network namespace, obtainable through an unprivileged user namespace, and the resulting wild access can leak memory or panic the kernel.

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

An off-by-one error in Linux kernel nl80211 allows local users to disclose or corrupt kernel memory via a crafted MLO link ID. The NL80211_ATTR_MLO_LINK_ID policy accepts IEEE80211_MLD_MAX_NUM_LINKS because netlink range validation is inclusive, then mac80211 indexes link arrays beyond their valid last element. Reaching the flaw requires CAP_NET_ADMIN in the network namespace, obtainable through an unprivileged user namespace, and the resulting wild access can leak memory or panic the kernel.

The record

CVE
CVE-2024-56663
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-193
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.19.2 <5.20
  2. Affected versionversion=6.0
  3. Affected versionversion=7a53ad13c09150076b7ddde96c2dfc5622c90b45
  4. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <29e640ae641b9f5ffc666049426d2b16c98d9963
  5. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <2e3dbf938656986cce73ac4083500d0bcfbffe24
  6. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <f3412522f78826fef1dfae40ef378a863df2591c
  7. Affected versionversion=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <f850d1d9f1106f528dfc5807565f2d1fa9a397d3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19.2 <5.20; version=6.0; version=7a53ad13c09150076b7ddde96c2dfc5622c90b45; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <29e640ae641b9f5ffc666049426d2b16c98d9963; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <2e3dbf938656986cce73ac4083500d0bcfbffe24; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <f3412522f78826fef1dfae40ef378a863df2591c; version=7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 <f850d1d9f1106f528dfc5807565f2d1fa9a397d3

Published CVSS scores

7.1CISACVSS: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-193Off-by-one Error

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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