media: v4l2-async: avoid deleting unlinked ASC entry on link error
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 1 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: media: v4l2-async: avoid deleting unlinked ASC entry on link error v4l2_async_match_notify() creates ancillary media links before adding asc->asc_subdev_entry to sd->asc_list. If ancillary link creation fails, the function jumps to err_call_unbind while asc_subdev_entry has not been linked yet. Async connections are zero-allocated, so the list entry still has NULL next and prev pointers on this path. Calling list_del() on it can therefore dereference NULL instead of returning the original link creation error. Do not delete asc_subdev_entry from err_call_unbind. There is no list insertion to undo on this path; the bound callback and sub-device registration are the operations that need to be rolled back.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.6.157, 6.12.110, 6.18.51, 7.2.5, 7.3
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
Not affected: 6 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89874
- 2026-10-03 Alias added: GHSA-rmqv-gxqc-vfx4
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Affected versions changed · Red Hat
- 2026-10-21 CVSS score added · Red Hat
- 2026-11-07 Affected versions changed · Red Hat
References
Other 5
- https://git.kernel.org/stable/c/d273571e531405426983c6a45ec635c7d0415eed
- https://git.kernel.org/stable/c/caac13f518d83974e9884d1eeda3d4cc3bb92978
- https://git.kernel.org/stable/c/3345746e0957bce6c53644838e4955710a82a962
- https://git.kernel.org/stable/c/a57d94026cb4fd7b3d258f0db2ad391cbccfaba5
- https://git.kernel.org/stable/c/47d82b605351c0e04f6365e42c8ffe2fcfdba615
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Sources
- CVE-2026-89874 · CVE Program
- CVE-2026-89874 · NVD
- FIRST EPSS
- GHSA-rmqv-gxqc-vfx4 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89874 · Red Hat security data · CC BY 4.0
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