CVE-2024-44986Network attack vector

Kernel memory corruption via IPv6 use-after-free

Published Sep 4, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel IPv6 output path allows remote attackers to read or write kernel memory or crash the host. When skb_expand_head() returns NULL, it frees the socket buffer, but ip6_finish_output2() continues using the associated dst and idev without an RCU read lock. Exploitation requires an atomic allocation failure, concurrent interface teardown, and a timely RCU grace period.

CVSS severity8.1
High
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

Use-after-free in the Linux kernel IPv6 output path allows remote attackers to read or write kernel memory or crash the host. When skb_expand_head() returns NULL, it frees the socket buffer, but ip6_finish_output2() continues using the associated dst and idev without an RCU read lock. Exploitation requires an atomic allocation failure, concurrent interface teardown, and a timely RCU grace period.

The record

CVE
CVE-2024-44986
Published
Sep 4, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2323690eb05865a657709f4d28eb9538ea97bfc2
  2. Affected versionversion=5.10.55 <5.11
  3. Affected versionversion=5.13.7 <5.14
  4. Affected versionversion=5.14
  5. Affected versionversion=5.4.137 <5.5
  6. Affected versionversion=5796015fa968a3349027a27dcd04c71d95c53ba5 <3574d28caf9a09756ae87ad1ea096c6f47b6101e
  7. Affected versionversion=5796015fa968a3349027a27dcd04c71d95c53ba5 <56efc253196751ece1fc535a5b582be127b0578a
  8. Affected versionversion=5796015fa968a3349027a27dcd04c71d95c53ba5 <6ab6bf731354a6fdbaa617d1ec194960db61cf3b
  9. Affected versionversion=5796015fa968a3349027a27dcd04c71d95c53ba5 <da273b377ae0d9bd255281ed3c2adb228321687b
  10. Affected versionversion=5796015fa968a3349027a27dcd04c71d95c53ba5 <e891b36de161fcd96f12ff83667473e5067b9037
  11. Affected versionversion=b34c668a867ffdcf8bd8db4a36512572e82b4a15
  12. Affected versionversion=ded37d03440d0ab346a8287cc2ba88b8dc90ceb0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2323690eb05865a657709f4d28eb9538ea97bfc2; version=5.10.55 <5.11; version=5.13.7 <5.14; version=5.14; version=5.4.137 <5.5; version=5796015fa968a3349027a27dcd04c71d95c53ba5 <3574d28caf9a09756ae87ad1ea096c6f47b6101e; version=5796015fa968a3349027a27dcd04c71d95c53ba5 <56efc253196751ece1fc535a5b582be127b0578a; version=5796015fa968a3349027a27dcd04c71d95c53ba5 <6ab6bf731354a6fdbaa617d1ec194960db61cf3b; version=5796015fa968a3349027a27dcd04c71d95c53ba5 <da273b377ae0d9bd255281ed3c2adb228321687b; version=5796015fa968a3349027a27dcd04c71d95c53ba5 <e891b36de161fcd96f12ff83667473e5067b9037; version=b34c668a867ffdcf8bd8db4a36512572e82b4a15; version=ded37d03440d0ab346a8287cc2ba88b8dc90ceb0

Published CVSS scores

8.1LinuxCVSS:3.1/AV:N/AC:H/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1190Exploit Public-Facing Application

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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