Linux Kernel up to 7.2.4 cx23885 netup_ci_exit use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 7.2.4. Impacted is the function netup_ci_exit of the component cx23885. Performing a manipulation results in use after free. This vulnerability is cataloged as CVE-2026-89893. The attack must be initiated from a local position. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.4. This affects the function netup_ci_exit of the component cx23885. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: media: cx23885: cancel NetUP CI work before teardown netup_ci_exit() frees a netup_ci_state while its work item, netup_read_ci_status(), may still be pending or running on the system workqueue. The worker obtains the state with container_of() and dereferences it, so it must not outlive the state. netup_ci_init() queues the initial status read, and CI GPIO interrupts subsequently queue the same work from netup_ci_slot_status(). During remove, cx23885_finidev() calls free_irq() before the CI device is unregistered. free_irq() prevents further IRQ handlers from running, but does not drain work queued previously, so the worker can run after netup_ci_exit() frees the state. Call cancel_work_sync() before dvb_ca_en50221_release() and kfree(). This issue was found by an in-house static analysis tool.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-89893 since 09/11/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around 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 aaf76794b870b0f391eff339252a2e2e22f33a4a/f7ff5adb63c1b277565afa54ccc0924d841b4a52/140ecbcbf978fbe60f83f8d4f8b1199029a5c763/ec82b0cf7f75fd95802592dcc9560fc7f529bba4/5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5/bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146/99cd62b9b1c818d6d01a87be9a8e5796314150a2/4e143d662ca94888b494b2427fc9e34494eb933a is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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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: No

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: aaf76794b870b0f391eff339252a2e2e22f33a4a/f7ff5adb63c1b277565afa54ccc0924d841b4a52/140ecbcbf978fbe60f83f8d4f8b1199029a5c763/ec82b0cf7f75fd95802592dcc9560fc7f529bba4/5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5/bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146/99cd62b9b1c818d6d01a87be9a8e5796314150a2/4e143d662ca94888b494b2427fc9e34494eb933a

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-2026-89893 (🔒)
GCVE (CVE): GCVE-0-2026-89893
GCVE (VulDB): GCVE-100-405729

Entryinfo

Created: 09/16/2026 14:18
Changes: 09/16/2026 14:18 (59)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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