Linux Kernel up to 7.2.4 video-i2c start_streaming kthread_vid_cap denial of service

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.45

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel up to 7.2.4. Affected by this issue is the function start_streaming of the component video-i2c. This manipulation of the argument kthread_vid_cap causes denial of service. This vulnerability appears as CVE-2026-89871. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Linux Kernel up to 7.2.4. Affected by this vulnerability is the function start_streaming of the component video-i2c. The manipulation of the argument kthread_vid_cap with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure kthread_run() returns an ERR_PTR on failure, not NULL. When start_streaming() fails, data->kthread_vid_cap is left holding this error pointer instead of being cleared. This causes two subsequent bugs: 1. A future call to start_streaming() sees a non-NULL kthread_vid_cap and returns 0 (success) immediately, without actually starting the capture thread. 2. A call to stop_streaming() checks 'kthread_vid_cap == NULL' which is false for an error pointer, and proceeds to call kthread_stop() on the error pointer, leading to a kernel crash. Fix this by resetting kthread_vid_cap to NULL on failure before jumping to the error path.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-89871 since 09/11/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/16/2026). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

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 db0f4531aa55cfb0171684ebfffe3ff04b79d5a8/0fac63cac6689588da530764ccb6ba55ee8e4d8b/5c35d380bea60503c4fe0986fe1de6a3263282b3/3d1b10d81fe54852ed953f4129577b733bbd6907/968c5213e34c48d35febdfd09cf3dc58ad039140/52fd9d80c0cea7bf09e7ee36cad316e5c39b7fe6/0e7f2cd72a4f9268ee09a13b13f3339e7cc71557/76e379754ba618989f6215be608d5c04774a611d is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.4
VulDB Temp Score: 5.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: CWE-404
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: db0f4531aa55cfb0171684ebfffe3ff04b79d5a8/0fac63cac6689588da530764ccb6ba55ee8e4d8b/5c35d380bea60503c4fe0986fe1de6a3263282b3/3d1b10d81fe54852ed953f4129577b733bbd6907/968c5213e34c48d35febdfd09cf3dc58ad039140/52fd9d80c0cea7bf09e7ee36cad316e5c39b7fe6/0e7f2cd72a4f9268ee09a13b13f3339e7cc71557/76e379754ba618989f6215be608d5c04774a611d

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-2026-89871 (🔒)
GCVE (CVE): GCVE-0-2026-89871
GCVE (VulDB): GCVE-100-405703

Entryinfo

Created: 09/16/2026 13:59
Changes: 09/16/2026 13:59 (60)
Complete: 🔍
Cache ID: 216::103

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