CVE-2026-46065
Description
In the Linux kernel, the following vulnerability has been resolved: fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info Hold state of deferred I/O in struct fb_deferred_io_state. Allocate an instance as part of initializing deferred I/O and remove it only after the final mapping has been closed. If the fb_info and the contained deferred I/O meanwhile goes away, clear struct fb_deferred_io_state.info to invalidate the mapping. Any access will then result in a SIGBUS signal. Fixes a long-standing problem, where a device hot-unplug happens while user space still has an active mapping of the graphics memory. The hot- unplug frees the instance of struct fb_info. Accessing the memory will operate on undefined state.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 7.0.4-1 |
| debian | sid | fixed | 7.0.4-1 |
| debian | trixie | fixed | 6.12.88-1 |
References
- https://git.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0
- https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066
- https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0db
- https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70
- https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429
- https://security-tracker.debian.org/tracker/CVE-2026-46065
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.