CVE-2026-64012

Kernel panic via inconsistent child dequeue

Published Jul 19, 2026 · Updated Jul 19, 2026

Denial of service in the Linux kernel's sch_sfb scheduler allows local users to trigger a kernel panic through a crafted qdisc hierarchy. After a child peek places a packet in the qdisc gso_skb queue, sfb_dequeue calls the child's direct dequeue operation instead of consuming the previously peeked packet. The trigger requires SFB to contain a child using qdisc_peek_dequeued within a parent scheduler, and the bounded consequence is a host-wide crash.

CVSS severity5.5
Medium
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

Denial of service in the Linux kernel's sch_sfb scheduler allows local users to trigger a kernel panic through a crafted qdisc hierarchy. After a child peek places a packet in the qdisc gso_skb queue, sfb_dequeue calls the child's direct dequeue operation instead of consuming the previously peeked packet. The trigger requires SFB to contain a child using qdisc_peek_dequeued within a parent scheduler, and the bounded consequence is a host-wide crash.

The record

CVE
CVE-2026-64012
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=2.6.39
  2. Affected versionversion=e13e02a3c68d899169c78d9a18689bd73491d59a <1b9bc71153b01dbde8045b9edede4240f4f5520e
  3. Affected versionversion=e13e02a3c68d899169c78d9a18689bd73491d59a <1e70274d3b81de28973bcdbce40a512bcb181ff9
  4. Affected versionversion=e13e02a3c68d899169c78d9a18689bd73491d59a <6c153d97c100f5b282c424101d8ff63122306997
  5. Affected versionversion=e13e02a3c68d899169c78d9a18689bd73491d59a <84bfbfc0c48731bcce74cdf4f9c497547ec525e0
  6. Affected versionversion=e13e02a3c68d899169c78d9a18689bd73491d59a <9ad3288632c859cf84183199832d822e7a70bdae
  7. Affected versionversion=e13e02a3c68d899169c78d9a18689bd73491d59a <dbc560858da8b77dd9e4ef0cd93d421e0e4d7e0e
  8. Affected versionversion=e13e02a3c68d899169c78d9a18689bd73491d59a <e125f5980b730c67c92a30cf150ec8c3d6777318
  9. Affected versionversion=e13e02a3c68d899169c78d9a18689bd73491d59a <e5ea51e5f3fbba41d50cd84a530f33bc1c8f4d57

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.39; version=e13e02a3c68d899169c78d9a18689bd73491d59a <1b9bc71153b01dbde8045b9edede4240f4f5520e; version=e13e02a3c68d899169c78d9a18689bd73491d59a <1e70274d3b81de28973bcdbce40a512bcb181ff9; version=e13e02a3c68d899169c78d9a18689bd73491d59a <6c153d97c100f5b282c424101d8ff63122306997; version=e13e02a3c68d899169c78d9a18689bd73491d59a <84bfbfc0c48731bcce74cdf4f9c497547ec525e0; version=e13e02a3c68d899169c78d9a18689bd73491d59a <9ad3288632c859cf84183199832d822e7a70bdae; version=e13e02a3c68d899169c78d9a18689bd73491d59a <dbc560858da8b77dd9e4ef0cd93d421e0e4d7e0e; version=e13e02a3c68d899169c78d9a18689bd73491d59a <e125f5980b730c67c92a30cf150ec8c3d6777318; version=e13e02a3c68d899169c78d9a18689bd73491d59a <e5ea51e5f3fbba41d50cd84a530f33bc1c8f4d57

Published CVSS scores

5.5TenableCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9TenableAV:L/AC:L/Au:N/C:N/I:N/A:C

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

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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