Linux Kernel up to 7.2.4 drm drm_dev_register race condition

CVSS Meta Temp Score
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CTI Interest Score
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8.6$0-$5k0.00+

Summaryinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 7.2.4. This affects the function drm_dev_register of the component drm. Such manipulation leads to race condition. This vulnerability is listed as CVE-2026-89823. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.4. It has been rated as very critical. Affected by this issue is the function drm_dev_register of the component drm. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: drm: fix race between partial drm_dev_register() failure and ioctl If drm_dev_register() fails after registering a minor (e.g. render minor registered, primary minor fails), userspace could have opened the first minor and entered a drm_dev_enter() critical section. Since the unplugged flag was never set, the ioctl proceeds while the error path tears down device resources. Fix this by introducing drm_dev_synchronize_unplug(), which sets the unplugged flag and waits for the SRCU barrier, ensuring all in-flight drm_dev_enter() critical sections complete before cleanup proceeds; call it on the error path of drm_dev_register().

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-89823 since 09/11/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/16/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5 or 7.3-rc1 eliminates this vulnerability. Applying the patch 26d9162213952927cd59c0d94b7e0e992b347bec/24d28d15c0f7f7d4a1c229f8730314f0f8758810/6729990df9e70623bf53f855b521ae71ca9cb278/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c/19dbfe4d586aecfed121cb3fa62281761d9d341f/79d09cfe90304ff4f195e47d569800f5e0f8b854/2d1215a72159d00001e08dee162e27718934bee9/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.0
VulDB Meta Temp Score: 8.6

VulDB Base Score: 9.0
VulDB Temp Score: 8.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
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 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.51/7.2.5/7.3-rc1
Patch: 26d9162213952927cd59c0d94b7e0e992b347bec/24d28d15c0f7f7d4a1c229f8730314f0f8758810/6729990df9e70623bf53f855b521ae71ca9cb278/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c/19dbfe4d586aecfed121cb3fa62281761d9d341f/79d09cfe90304ff4f195e47d569800f5e0f8b854/2d1215a72159d00001e08dee162e27718934bee9/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e

Timelineinfo

09/11/2026 CVE reserved
09/16/2026 +5 days Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/16/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-89823 (🔒)
GCVE (CVE): GCVE-0-2026-89823
GCVE (VulDB): GCVE-100-405638

Entryinfo

Created: 09/16/2026 13:09
Changes: 09/16/2026 13:09 (59)
Complete: 🔍
Cache ID: 216::103

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