CVE-2026-68338

Local denial of service via stale fanout hook

Published Aug 10, 2026 · Updated Aug 10, 2026

A race condition in the Linux net/packet subsystem allows local users to cause a denial of service during packet-ring reconfiguration. packet_set_ring() drops po->bind_lock, then can re-register a one-member fanout hook from stale was_running state after NETDEV_UNREGISTER invalidates the device binding. Exploitation requires low-privileged local access and a concurrent device-unregister event; the resulting inconsistent hook state interrupts the system.

CVSS severity7.0
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in the Linux net/packet subsystem allows local users to cause a denial of service during packet-ring reconfiguration. packet_set_ring() drops po->bind_lock, then can re-register a one-member fanout hook from stale was_running state after NETDEV_UNREGISTER invalidates the device binding. Exploitation requires low-privileged local access and a concurrent device-unregister event; the resulting inconsistent hook state interrupts the system.

The record

CVE
CVE-2026-68338
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1499
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

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=3.1
  2. Affected versionversion=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <0a052e0808e015e68144a9877e6ef42b952c49fa
  3. Affected versionversion=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <1bc55c29cd85818e9052f17deb287d5a11fb817f
  4. Affected versionversion=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <50aff80475abd3533eef4320477037e6fcc6b56e
  5. Affected versionversion=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <80ec024d53a05c60ad1d08968dcf745f10c1665c
  6. Affected versionversion=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <a885387dae7986a55bae5c77a15bdd447f64e9b9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.1; version=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <0a052e0808e015e68144a9877e6ef42b952c49fa; version=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <1bc55c29cd85818e9052f17deb287d5a11fb817f; version=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <50aff80475abd3533eef4320477037e6fcc6b56e; version=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <80ec024d53a05c60ad1d08968dcf745f10c1665c; version=dc99f600698dcac69b8f56dda9a8a00d645c5ffc <a885387dae7986a55bae5c77a15bdd447f64e9b9

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/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.

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

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-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499Endpoint Denial of Service

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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