CVE-2026-89893

media: cx23885: cancel NetUP CI work before teardown

State: Published
Severity: 7.8 High
Published: Sep 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before aaf76794b870b0f391eff339252a2e2e22f33a4aAffected c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before f7ff5adb63c1b277565afa54ccc0924d841b4a52Affected c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before 140ecbcbf978fbe60f83f8d4f8b1199029a5c763Affected c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before ec82b0cf7f75fd95802592dcc9560fc7f529bba4Affected c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before 5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5Affected c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146Affected c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before 99cd62b9b1c818d6d01a87be9a8e5796314150a2Affected c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before 4e143d662ca94888b494b2427fc9e34494eb933aAffected
LinuxLinux	2.6.30Affected before 2.6.30Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before aaf76794b870b0f391eff339252a2e2e22f33a4aAffected
c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before f7ff5adb63c1b277565afa54ccc0924d841b4a52Affected
c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before 140ecbcbf978fbe60f83f8d4f8b1199029a5c763Affected
c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before ec82b0cf7f75fd95802592dcc9560fc7f529bba4Affected
c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before 5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5Affected
c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146Affected
c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before 99cd62b9b1c818d6d01a87be9a8e5796314150a2Affected
c184dcd282337c09695a4c1761d7ac77fdc8fb7d to before 4e143d662ca94888b494b2427fc9e34494eb933aAffected

LinuxLinux

2.6.30Affected
before 2.6.30Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.5 through 7.2.*Not affected
7.3 and laterNot affected

References

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