CVE-2024-38544

Kernel crash via RXE response use-after-free

Published Jun 19, 2024 · Updated Aug 5, 2026

Use-after-free in Linux 4.12 and later allows attackers to crash the kernel during RDMA RXE response packet processing. The rxe_comp_queue_pkt function enqueues an incoming response skb before incrementing its hardware counter, allowing a concurrent completer thread to free the skb before that dereference. The race requires RXE traffic and concurrent completer execution and was observed only infrequently during high-scale testing; success causes a kernel segmentation fault.

CVSS severity9.8
Critical
EPSS probability0.81%
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 Linux 4.12 and later allows attackers to crash the kernel during RDMA RXE response packet processing. The rxe_comp_queue_pkt function enqueues an incoming response skb before incrementing its hardware counter, allowing a concurrent completer thread to free the skb before that dereference. The race requires RXE traffic and concurrent completer execution and was observed only infrequently during high-scale testing; success causes a kernel segmentation fault.

The record

CVE
CVE-2024-38544
Published
Jun 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 19, 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=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <21b4c6d4d89030fd4657a8e7c8110fd941049794
  2. Affected versionversion=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <2b23b6097303ed0ba5f4bc036a1c07b6027af5c6
  3. Affected versionversion=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <30df4bef8b8e183333e9b6e9d4509d552c7da6eb
  4. Affected versionversion=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <bbad88f111a1829f366c189aa48e7e58e57553fc
  5. Affected versionversion=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <c91fb72a2ca6480d8d77262eef52dc5b178463a3
  6. Affected versionversion=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <de5a059e36657442b5637cc16df5163e435b9cb4
  7. Affected versionversion=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <e0e14dd35d4242340c7346aac60c7ff8fbf87ffc
  8. Affected versionversion=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19
  9. Affected versionversion=4.12

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <21b4c6d4d89030fd4657a8e7c8110fd941049794; version=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <2b23b6097303ed0ba5f4bc036a1c07b6027af5c6; version=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <30df4bef8b8e183333e9b6e9d4509d552c7da6eb; version=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <bbad88f111a1829f366c189aa48e7e58e57553fc; version=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <c91fb72a2ca6480d8d77262eef52dc5b178463a3; version=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <de5a059e36657442b5637cc16df5163e435b9cb4; version=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <e0e14dd35d4242340c7346aac60c7ff8fbf87ffc; version=0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 <faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19; version=4.12

Published CVSS scores

6.3CISA-ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
6.3NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
9.8kernel.org CNACVSS:3.1/AV:N/AC:L/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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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