Linux Kernel up to 6.12.91/6.18.33/7.0.10 sched_ext scx_root_enable_workfn use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.7$5k-$25k0.00

Summaryinfo

A vulnerability described as very critical has been identified in Linux Kernel up to 6.12.91/6.18.33/7.0.10. Affected by this vulnerability is the function scx_root_enable_workfn of the component sched_ext. Executing a manipulation can lead to use after free. The identification of this vulnerability is CVE-2026-64226. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.12.91/6.18.33/7.0.10 and classified as very critical. This vulnerability affects the function scx_root_enable_workfn of the component sched_ext. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path In scx_root_enable_workfn(), put_task_struct(p) is called before scx_error() dereferences p->comm and p->pid. If the iterator's reference is the last drop, the task is freed synchronously and the deref becomes a UAF. Move put_task_struct() past scx_error().

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-64226 since 07/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/30/2026).

Upgrading to version 6.12.92, 6.18.34 or 7.0.11 eliminates this vulnerability. Applying the patch cf396941901858b0de426cdcd3974eea6a02c98c/45c7c4e3db8b700307313c035ea08be829a7f21b/57e19ba3f58a67eb924022a5a60b67fd08e5cbbd/9a415cc53711f2238e0f0ca8a6bcc796c003b127 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-2527). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Red Hat OpenShift
  • RESF Rocky Linux
  • SUSE Linux
  • Ubuntu Linux
  • Oracle Linux
  • Open Source Linux Kernel

Productinfo

Type

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.9
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.92/6.18.34/7.0.11
Patch: cf396941901858b0de426cdcd3974eea6a02c98c/45c7c4e3db8b700307313c035ea08be829a7f21b/57e19ba3f58a67eb924022a5a60b67fd08e5cbbd/9a415cc53711f2238e0f0ca8a6bcc796c003b127

Timelineinfo

07/19/2026 CVE reserved
07/24/2026 +5 days Advisory disclosed
07/24/2026 +0 days VulDB entry created
08/30/2026 +37 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64226 (🔒)
GCVE (CVE): GCVE-0-2026-64226
GCVE (VulDB): GCVE-100-382954
CERT Bund: WID-SEC-2026-2527 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 07/24/2026 18:20
Updated: 08/30/2026 20:29
Changes: 07/24/2026 18:20 (59), 07/28/2026 02:52 (7), 07/29/2026 22:51 (1), 08/17/2026 02:44 (11), 08/30/2026 20:29 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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