CVE-2024-46763

Host crash via FOU GRO teardown race

Published Sep 18, 2024 · Updated Aug 5, 2026

NULL pointer dereference in the Linux FOU GRO path allows local users to crash a host during tunnel or network-namespace teardown. fou_release clears sk_user_data before an in-flight udp4_gro_receive call can finish, and fou_gro_receive dereferences the cleared pointer. Exploitation requires low-privilege local access and precise overlap with teardown; the documented consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux FOU GRO path allows local users to crash a host during tunnel or network-namespace teardown. fou_release clears sk_user_data before an in-flight udp4_gro_receive call can finish, and fou_gro_receive dereferences the cleared pointer. Exploitation requires low-privilege local access and precise overlap with teardown; the documented consequence is a kernel crash.

The record

CVE
CVE-2024-46763
Published
Sep 18, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 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=4.7
  2. Affected versionversion=d92283e338f6d6503b7417536bf3478f466cbc01 <1df42be305fe478ded1ee0c1d775f4ece713483b
  3. Affected versionversion=d92283e338f6d6503b7417536bf3478f466cbc01 <231c235d2f7a66f018f172e26ffd47c363f244ef
  4. Affected versionversion=d92283e338f6d6503b7417536bf3478f466cbc01 <4494bccb52ffda22ce5a1163a776d970e6229e08
  5. Affected versionversion=d92283e338f6d6503b7417536bf3478f466cbc01 <7e4196935069947d8b70b09c1660b67b067e75cb
  6. Affected versionversion=d92283e338f6d6503b7417536bf3478f466cbc01 <c46cd6aaca81040deaea3500ba75126963294bd9
  7. Affected versionversion=d92283e338f6d6503b7417536bf3478f466cbc01 <d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.7; version=d92283e338f6d6503b7417536bf3478f466cbc01 <1df42be305fe478ded1ee0c1d775f4ece713483b; version=d92283e338f6d6503b7417536bf3478f466cbc01 <231c235d2f7a66f018f172e26ffd47c363f244ef; version=d92283e338f6d6503b7417536bf3478f466cbc01 <4494bccb52ffda22ce5a1163a776d970e6229e08; version=d92283e338f6d6503b7417536bf3478f466cbc01 <7e4196935069947d8b70b09c1660b67b067e75cb; version=d92283e338f6d6503b7417536bf3478f466cbc01 <c46cd6aaca81040deaea3500ba75126963294bd9; version=d92283e338f6d6503b7417536bf3478f466cbc01 <d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3

Published CVSS scores

5.5Canonical UbuntuCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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