CVE-2024-42271

Local privilege escalation via AF_IUCV teardown race

Published Aug 17, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel AF_IUCV subsystem allows local users to crash the host or escalate privileges through a socket race. iucv_sock_close() tests iucv->path without an atomic compare-and-swap, so a concurrent iucv_callback_connrej() can sever and free the path before the close path dereferences it. An unprivileged user on an s390 system with AF_IUCV support can race socket closes; successful reuse can expose or corrupt kernel memory, while the observed failure is 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 AF_IUCV subsystem allows local users to crash the host or escalate privileges through a socket race. iucv_sock_close() tests iucv->path without an atomic compare-and-swap, so a concurrent iucv_callback_connrej() can sever and free the path before the close path dereferences it. An unprivileged user on an s390 system with AF_IUCV support can race socket closes; successful reuse can expose or corrupt kernel memory, while the observed failure is a kernel panic.

The record

CVE
CVE-2024-42271
Published
Aug 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 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=3.4
  2. Affected versionversion=7d316b9453523498246e9e19a659c423d4c5081e <01437282fd3904810603f3dc98d2cac6b8b6fc84
  3. Affected versionversion=7d316b9453523498246e9e19a659c423d4c5081e <37652fbef9809411cea55ea5fa1a170e299efcd0
  4. Affected versionversion=7d316b9453523498246e9e19a659c423d4c5081e <69620522c48ce8215e5eb55ffbab8cafee8f407d
  5. Affected versionversion=7d316b9453523498246e9e19a659c423d4c5081e <84f40b46787ecb67c7ad08a5bb1376141fa10c01
  6. Affected versionversion=7d316b9453523498246e9e19a659c423d4c5081e <8b424c9e44111c5a76f41c6b741f8d4c4179d876
  7. Affected versionversion=7d316b9453523498246e9e19a659c423d4c5081e <ac758e1f663fe9bc64f6b47212a2aa18697524f5
  8. Affected versionversion=7d316b9453523498246e9e19a659c423d4c5081e <c65f72eec60a34ace031426e04e9aff8e5f04895
  9. Affected versionversion=7d316b9453523498246e9e19a659c423d4c5081e <f558120cd709682b739207b48cf7479fd9568431

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.4; version=7d316b9453523498246e9e19a659c423d4c5081e <01437282fd3904810603f3dc98d2cac6b8b6fc84; version=7d316b9453523498246e9e19a659c423d4c5081e <37652fbef9809411cea55ea5fa1a170e299efcd0; version=7d316b9453523498246e9e19a659c423d4c5081e <69620522c48ce8215e5eb55ffbab8cafee8f407d; version=7d316b9453523498246e9e19a659c423d4c5081e <84f40b46787ecb67c7ad08a5bb1376141fa10c01; version=7d316b9453523498246e9e19a659c423d4c5081e <8b424c9e44111c5a76f41c6b741f8d4c4179d876; version=7d316b9453523498246e9e19a659c423d4c5081e <ac758e1f663fe9bc64f6b47212a2aa18697524f5; version=7d316b9453523498246e9e19a659c423d4c5081e <c65f72eec60a34ace031426e04e9aff8e5f04895; version=7d316b9453523498246e9e19a659c423d4c5081e <f558120cd709682b739207b48cf7479fd9568431

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

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 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

T1068Exploitation for Privilege Escalation

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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