CVE-2026-68397

System crash via AF_IUCV socket reference race

Published Aug 10, 2026 · Updated Aug 10, 2026

Use-after-free in the Linux kernel AF_IUCV networking code allows local users to crash the system by racing socket closure. The afiucv_hs_rcv() path drops iucv_sk_list.lock without first holding a reference, so iucv_sock_kill() can free the socket before an afiucv_hs_callback_*() handler dereferences it. Exploitation requires access to create and close AF_IUCV sockets and winning the close-versus-receive race; a successful attempt interrupts the system through a kernel crash.

CVSS severity8.8
High
EPSS probability0.27%
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 networking code allows local users to crash the system by racing socket closure. The afiucv_hs_rcv() path drops iucv_sk_list.lock without first holding a reference, so iucv_sock_kill() can free the socket before an afiucv_hs_callback_*() handler dereferences it. Exploitation requires access to create and close AF_IUCV sockets and winning the close-versus-receive race; a successful attempt interrupts the system through a kernel crash.

The record

CVE
CVE-2026-68397
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=3.2
  2. Affected versionversion=3881ac441f642d56503818123446f7298442236b <1801cb20a5025a787d6853e19c38db138344b4b4
  3. Affected versionversion=3881ac441f642d56503818123446f7298442236b <4dc0e63abf8bc7ba8892e617c1fb8b204361e022
  4. Affected versionversion=3881ac441f642d56503818123446f7298442236b <4fa349156043dc119721d067329714179f501749
  5. Affected versionversion=3881ac441f642d56503818123446f7298442236b <5595ea59cdf29182cf6a270cacc1426c57b603de
  6. Affected versionversion=3881ac441f642d56503818123446f7298442236b <c75a950e77356e526672cba4584080c6c8b793b6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=3881ac441f642d56503818123446f7298442236b <1801cb20a5025a787d6853e19c38db138344b4b4; version=3881ac441f642d56503818123446f7298442236b <4dc0e63abf8bc7ba8892e617c1fb8b204361e022; version=3881ac441f642d56503818123446f7298442236b <4fa349156043dc119721d067329714179f501749; version=3881ac441f642d56503818123446f7298442236b <5595ea59cdf29182cf6a270cacc1426c57b603de; version=3881ac441f642d56503818123446f7298442236b <c75a950e77356e526672cba4584080c6c8b793b6

Published CVSS scores

8.8Linux Kernel CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/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 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-825Expired Pointer Dereference
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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