CVE-2024-26996

Local privilege escalation via stale f_ncm pointer

Published May 1, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel f_ncm USB gadget function allows local users to gain kernel privileges through a stale pointer. After an endpoint enable error, ncm_disable skips gether_disconnect because it checks the disabled endpoint, leaving dev->port_usb bound to the freed ncm object across rebind. Exploitation requires local gadget and network-interface reconfiguration followed by usb0 transmission; dereferencing reclaimed memory allows kernel control-flow hijacking or a kernel panic.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel f_ncm USB gadget function allows local users to gain kernel privileges through a stale pointer. After an endpoint enable error, ncm_disable skips gether_disconnect because it checks the disabled endpoint, leaving dev->port_usb bound to the freed ncm object across rebind. Exploitation requires local gadget and network-interface reconfiguration followed by usb0 transmission; dereferencing reclaimed memory allows kernel control-flow hijacking or a kernel panic.

The record

CVE
CVE-2024-26996
Published
May 1, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=4.4
  2. Affected versionversion=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <0588bbbd718a8130b98c54518f1e0b569ce60a93
  3. Affected versionversion=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <6334b8e4553cc69f51e383c9de545082213d785e
  4. Affected versionversion=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <7250326cbb1f4f90391ac511a126b936cefb5bb7
  5. Affected versionversion=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <7f67c2020cb08499c400abf0fc32c65e4d9a09ca
  6. Affected versionversion=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <f356fd0cbd9c9cbd0854657a80d1608d0d732db3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.4; version=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <0588bbbd718a8130b98c54518f1e0b569ce60a93; version=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <6334b8e4553cc69f51e383c9de545082213d785e; version=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <7250326cbb1f4f90391ac511a126b936cefb5bb7; version=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <7f67c2020cb08499c400abf0fc32c65e4d9a09ca; version=6b4012a2e4d4702f8fb0ee1db1c0f0b17ab7d41b <f356fd0cbd9c9cbd0854657a80d1608d0d732db3

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free
T1068Exploitation for Privilege Escalation

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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