CVE-2024-56687

Rx endpoint lockup via in-queue completion callback

Published Dec 28, 2024 · Updated May 11, 2026

Improper locking in the Linux kernel MUSB gadget driver from 5.18 allows local users to lock an Rx endpoint through crafted USB traffic. The MUSB receive path invokes a completion callback from usb_ep_queue() while RXPKTRDY remains set after an empty-queue interrupt, violating the callback's locking contract. When USB Ethernet brings the interface up after a packet arrived while it was down, callback IRQ re-enablement can leave the endpoint unable to receive further host packets.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux kernel MUSB gadget driver from 5.18 allows local users to lock an Rx endpoint through crafted USB traffic. The MUSB receive path invokes a completion callback from usb_ep_queue() while RXPKTRDY remains set after an empty-queue interrupt, violating the callback's locking contract. When USB Ethernet brings the interface up after a packet arrived while it was down, callback IRQ re-enablement can leave the endpoint unable to receive further host packets.

The record

CVE
CVE-2024-56687
Published
Dec 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 28, 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=5.18
  2. Affected versionversion=baebdf48c360080710f80699eea3affbb13d6c65 <0c89445e6d475b78d37b64ae520831cd43af7db4
  3. Affected versionversion=baebdf48c360080710f80699eea3affbb13d6c65 <3fc137386c4620305bbc2a216868c53f9245670a
  4. Affected versionversion=baebdf48c360080710f80699eea3affbb13d6c65 <5906ee3693674d734177df13a519a21bb03f730d
  5. Affected versionversion=baebdf48c360080710f80699eea3affbb13d6c65 <c749500b28cae67410792096133ee7f282439c51
  6. Affected versionversion=baebdf48c360080710f80699eea3affbb13d6c65 <f05ad9755bb294328c3d0f429164ac6d4d08c548

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=baebdf48c360080710f80699eea3affbb13d6c65 <0c89445e6d475b78d37b64ae520831cd43af7db4; version=baebdf48c360080710f80699eea3affbb13d6c65 <3fc137386c4620305bbc2a216868c53f9245670a; version=baebdf48c360080710f80699eea3affbb13d6c65 <5906ee3693674d734177df13a519a21bb03f730d; version=baebdf48c360080710f80699eea3affbb13d6c65 <c749500b28cae67410792096133ee7f282439c51; version=baebdf48c360080710f80699eea3affbb13d6c65 <f05ad9755bb294328c3d0f429164ac6d4d08c548

Published CVSS scores

5.5CISACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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-667Improper Locking
T1499.004Application or System Exploitation

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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