Unknown

CVE-2026-89901 — media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref

In the Linux kernel, the following vulnerability has been resolved: media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref airspy_disconnect() clears s->udev under v4l2_lock, but airspy_stop_streaming() unconditionally calls airspy_ctrl_msg() and airspy_free_stream_bufs() afterwards. If a streaming user closes the device after disconnect, stop_streaming() runs and dereferences the NULL s->udev: airspy_stop_streaming() airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0) usb_sndctrlpipe(s->udev, 0) /* NULL deref */ airspy_free_stream_bufs(s) usb_free_coherent(s->udev, ...) /* NULL deref */ The airspy driver uses vb2_fop_release() in its file_operations, so replace video_unregister_device(&s->vdev) with vb2_video_unregister_device(&s->vdev) and move it before clearing s->udev. vb2_video_unregister_device() releases the vb2 queue, which synchronously runs airspy_stop_streaming() if streaming is active, so the URBs, coherent DMA stream buffers and the hardware stop control message all execute while s->udev is still valid. vb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock) internally, and stop_streaming() locks v4l2_lock, so the previous outer mutex_lock(&s->vb_queue_lock) / mutex_lock(&s->v4l2_lock) pair around the unregister sequence would self-deadlock and has been removed. A short v4l2_lock critical section around s->udev = NULL remains so any ioctl path that still holds the file descriptor sees coherent state. Issue identified by automated review of the INV-003 series at https://sashiko.dev/

Published Sep 16, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.21%

ahead of 11% of scored CVEs · Oct 19, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 634fe5033951b80ef4b98d8f047cb1083d29170d and < c9081e2655188d2d134a741aec837dc70439d505≥ 634fe5033951b80ef4b98d8f047cb1083d29170d and < 75089cea32e5055773bd13116236d08fdc98678a≥ 634fe5033951b80ef4b98d8f047cb1083d29170d and < 155d0378ae0d6305cc4840583a6b42d2d0595bff≥ 634fe5033951b80ef4b98d8f047cb1083d29170d and < 6e4ea90fdc6608cd5fac342e146ab6ae15d430bc≥ 634fe5033951b80ef4b98d8f047cb1083d29170d and < a9a8c37ddda9fa3687b142be9098e1c37b8faf35≥ 634fe5033951b80ef4b98d8f047cb1083d29170d and < 297fee023f46d771a844520675692ea089d80d9d≥ 634fe5033951b80ef4b98d8f047cb1083d29170d and < c6749ac8f59cc80eb1b2d52f167fdf13e12655cc≥ 634fe5033951b80ef4b98d8f047cb1083d29170d and < 2f378dc45e685fc825d2dd08e7864666d6fcc009 and 1 more version 3.17	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 19, 2026 · 4 reading(s) · max 0.21%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 16, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

10 on the record

github.com/advisories/GHSA-wfp4-jcv3-wqgx
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2026-89901
GitHub Security Advisories
git.kernel.org/stable/c/297fee023f46d771a844520675692ea089d80d9d
NIST National Vulnerability Database
git.kernel.org/stable/c/6e4ea90fdc6608cd5fac342e146ab6ae15d430bc
NIST National Vulnerability Database
git.kernel.org/stable/c/155d0378ae0d6305cc4840583a6b42d2d0595bff
NIST National Vulnerability Database
git.kernel.org/stable/c/c6749ac8f59cc80eb1b2d52f167fdf13e12655cc
NIST National Vulnerability Database
git.kernel.org/stable/c/75089cea32e5055773bd13116236d08fdc98678a
NIST National Vulnerability Database
git.kernel.org/stable/c/c9081e2655188d2d134a741aec837dc70439d505
NIST National Vulnerability Database
git.kernel.org/stable/c/2f378dc45e685fc825d2dd08e7864666d6fcc009
NIST National Vulnerability Database
git.kernel.org/stable/c/a9a8c37ddda9fa3687b142be9098e1c37b8faf35
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 2d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 2d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 2d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 2d
Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 2d
Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89901 is "media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.21% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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