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NVD / CVE Program· CNA Linux

CVE-2026-89893: media: cx23885: cancel NetUP CI work before teardown

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 140ecbcbf978fbe60f83f8d4f8b1199029a5c763, 4e143d662ca94888b494b2427fc9e34494eb933a, 5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 140ecbcbf978fbe60f83f8d4f8b1199029a5c763, 4e143d662ca94888b494b2427fc9e34494eb933a, 5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 16, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.30affected
    • c184dcd282337c09695a4c1761d7ac77fdc8fb7d and later · before aaf76794b870b0f391eff339252a2e2e22f33a4aaffected · git
    • c184dcd282337c09695a4c1761d7ac77fdc8fb7d and later · before f7ff5adb63c1b277565afa54ccc0924d841b4a52affected · git
    • c184dcd282337c09695a4c1761d7ac77fdc8fb7d and later · before 140ecbcbf978fbe60f83f8d4f8b1199029a5c763affected · git
    • c184dcd282337c09695a4c1761d7ac77fdc8fb7d and later · before ec82b0cf7f75fd95802592dcc9560fc7f529bba4affected · git
    • c184dcd282337c09695a4c1761d7ac77fdc8fb7d and later · before 5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5affected · git
    • c184dcd282337c09695a4c1761d7ac77fdc8fb7d and later · before bf3f49273d5bf6acbdad18ff44c01ffcf7a7a146affected · git
    • c184dcd282337c09695a4c1761d7ac77fdc8fb7d and later · before 99cd62b9b1c818d6d01a87be9a8e5796314150a2affected · git
    • c184dcd282337c09695a4c1761d7ac77fdc8fb7d and later · before 4e143d662ca94888b494b2427fc9e34494eb933aaffected · git
    • before 2.6.30not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-89891Sep 16, 2026 · media: em28xx: fix use-after-free of dev_next->devlist on disconnect
    0Monitor
  • ← EarlierCVE-2026-89892Sep 16, 2026 · media: em28xx: defer audio-only extension registration
    0Monitor
  • Later →CVE-2026-89894Sep 16, 2026 · media: cx231xx: reject geometry changes while the VBI queue is busy
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux140ecbcbf978fbe60f83f8d4f8b1199029a5c763Vendor (CNA)
Linux Linux4e143d662ca94888b494b2427fc9e34494eb933aVendor (CNA)
Linux Linux5deec890ecfa04d21cfa9bb9a2fe5e9dc98db5c5Vendor (CNA)
Linux Linux99cd62b9b1c818d6d01a87be9a8e5796314150a2Vendor (CNA)
Linux Linuxaaf76794b870b0f391eff339252a2e2e22f33a4aVendor (CNA)
Linux Linuxbf3f49273d5bf6acbdad18ff44c01ffcf7a7a146Vendor (CNA)
Linux Linuxec82b0cf7f75fd95802592dcc9560fc7f529bba4Vendor (CNA)
Linux Linuxf7ff5adb63c1b277565afa54ccc0924d841b4a52Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records