CVE-2026-89893 - Vulnerability Details

- media: cx23885: cancel NetUP CI work before teardown

Description

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.

Published: 2026-09-16

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability is a classic use‑after‑free error in the Linux kernel driver for cx23885. The driver frees a netup_ci_state object while a work queue still holds a reference to it. When the work queue executes the pending task, it dereferences the freed memory, allowing an attacker to tamper with kernel memory or cause a crash. This flaw can be exploited to compromise system integrity and potentially gain privileged execution.

Affected Systems

The issue affects the Linux kernel and all kernel versions that contain the cx23885 media driver without the described fix. The exact kernel package names are not listed, but any installation that ships the vulnerable media driver is at risk.

Risk and Exploitability

The CVSS score of 7.8 indicates high severity. The EPSS score is below 1%, suggesting low current exploitation probability. The vulnerability is not yet listed in CISA’s KEV catalog. The likely attack vector is local: an attacker must be able to trigger the netup_ci_driver through userspace or hardware interaction, after which the kernel can crash or execute arbitrary code. The impact scope is system‑wide, affecting all processes running on the kernel. Routine updates are the recommended mitigation, as the kernel patch removes the race condition by cancelling work before freeing the state.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`c184dcd282337c09695a4c1761d7ac77fdc8fb7d`	affected	< aaf76794b870b0f391eff339252a2e2e22f33a4a
`c184dcd282337c09695a4c1761d7ac77fdc8fb7d`	affected	< f7ff5adb63c1b277565afa54ccc0924d841b4a52
`c184dcd282337c09695a4c1761d7ac77fdc8fb7d`	affected	< 140ecbcbf978fbe60f83f8d4f8b1199029a5c763
`c184dcd282337c09695a4c1761d7ac77fdc8fb7d`	affected	< ec82b0cf7f75fd95802592dcc9560fc7f529bba4
`c184dcd282337c09695a4c1761d7ac77fdc8fb7d`	affected	< 5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5
`c184dcd282337c09695a4c1761d7ac77fdc8fb7d`	affected	< bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146
`c184dcd282337c09695a4c1761d7ac77fdc8fb7d`	affected	< 99cd62b9b1c818d6d01a87be9a8e5796314150a2
`c184dcd282337c09695a4c1761d7ac77fdc8fb7d`	affected	< 4e143d662ca94888b494b2427fc9e34494eb933a

Linux

affected

Version	Status	Constraints
`2.6.30`	affected	—
`0`	unaffected	< 2.6.30
`5.10.270`	unaffected	≤ 5.10.*
`5.15.221`	unaffected	≤ 5.15.*
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.51`	unaffected	≤ 6.18.*
`7.2.5`	unaffected	≤ 7.2.*
`7.3-rc1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[c184dcd282337c09695a4c1761d7ac77fdc8fb7d,aaf76794b870b0f391eff339252a2e2e22f33a4a)`	affected	code_commit	—
`[c184dcd282337c09695a4c1761d7ac77fdc8fb7d,f7ff5adb63c1b277565afa54ccc0924d841b4a52)`	affected	code_commit	—
`[c184dcd282337c09695a4c1761d7ac77fdc8fb7d,140ecbcbf978fbe60f83f8d4f8b1199029a5c763)`	affected	code_commit	—
`[c184dcd282337c09695a4c1761d7ac77fdc8fb7d,ec82b0cf7f75fd95802592dcc9560fc7f529bba4)`	affected	code_commit	—
`[c184dcd282337c09695a4c1761d7ac77fdc8fb7d,5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5)`	affected	code_commit	—
`[c184dcd282337c09695a4c1761d7ac77fdc8fb7d,bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146)`	affected	code_commit	—
`[c184dcd282337c09695a4c1761d7ac77fdc8fb7d,99cd62b9b1c818d6d01a87be9a8e5796314150a2)`	affected	code_commit	—
`[c184dcd282337c09695a4c1761d7ac77fdc8fb7d,4e143d662ca94888b494b2427fc9e34494eb933a)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`2.6.30`	affected	semver	—
`[0,2.6.30)`	unaffected	semver	—
`[5.10.270,5.11.0)`	unaffected	semver	—
`[5.15.221,5.16.0)`	unaffected	semver	—
`[6.1.188,6.2.0)`	unaffected	semver	—
`[6.6.157,6.7.0)`	unaffected	semver	—
`[6.12.110,6.13.0)`	unaffected	semver	—
`[6.18.51,6.19.0)`	unaffected	semver	—
`[7.2.5,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	generic	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade to the latest Linux kernel version that incorporates the fix for cx23885.
If upgrade is not possible, apply the patch from the Linux kernel repositories to cancel work items before freeing the state. (See the merge commits linked in the references.)
As an interim measure, ensure that any custom drivers or applications that use the cx23885 module call cancel_work_sync on pending work before cleanup operations.

Generated by OpenCVE AI on September 18, 2026 at 09:24 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DSA	DSA-6528-1	linux security update

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00176.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/140ecbcbf978fbe60f83f8d4f8b1199029a5c763
https://git.kernel.org/stable/c/4e143d662ca94888b494b2427fc9e34494eb933a
https://git.kernel.org/stable/c/5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5
https://git.kernel.org/stable/c/99cd62b9b1c818d6d01a87be9a8e5796314150a2
https://git.kernel.org/stable/c/aaf76794b870b0f391eff339252a2e2e22f33a4a
https://git.kernel.org/stable/c/bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146
https://git.kernel.org/stable/c/ec82b0cf7f75fd95802592dcc9560fc7f529bba4
https://git.kernel.org/stable/c/f7ff5adb63c1b277565afa54ccc0924d841b4a52

History

Fri, 18 Sep 2026 09:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-416

Wed, 16 Sep 2026 14:45:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Wed, 16 Sep 2026 10:45:00 +0000

Type	Values Removed	Values Added
Description		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.
Title		media: cx23885: cancel NetUP CI work before teardown
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/140ecbcbf978fbe60f83f8d4f8b1199029a5c763 https://git.kernel.org/stable/c/4e143d662ca94888b494b2427fc9e34494eb933a https://git.kernel.org/stable/c/5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5 https://git.kernel.org/stable/c/99cd62b9b1c818d6d01a87be9a8e5796314150a2 https://git.kernel.org/stable/c/aaf76794b870b0f391eff339252a2e2e22f33a4a https://git.kernel.org/stable/c/bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146 https://git.kernel.org/stable/c/ec82b0cf7f75fd95802592dcc9560fc7f529bba4 https://git.kernel.org/stable/c/f7ff5adb63c1b277565afa54ccc0924d841b4a52

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-09-16T10:31:55.374Z

Updated: 2026-09-16T14:39:43.386Z

Reserved: 2026-09-11T19:38:34.773Z

Link: CVE-2026-89893

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-16T11:16:58.000

Modified: 2026-09-16T15:18:15.647

Link: CVE-2026-89893

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-18T20:15:14Z

Weaknesses

CWE-416
Use After Free

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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