CVE-2026-46065

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux60b59beafba875aef6d378078bce0baf2287ae14 < 4aab89603b637a2e441b38808c4f6fe7d1184df6affected
LinuxLinux60b59beafba875aef6d378078bce0baf2287ae14 < 4fda0d6b45faad44926dd3e4f55f118d899b2e27affected
LinuxLinux60b59beafba875aef6d378078bce0baf2287ae14 < 2a40f8bc9bb713329f1c35ffc199ee961a7135b0affected
LinuxLinux60b59beafba875aef6d378078bce0baf2287ae14 < 2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066affected
LinuxLinux60b59beafba875aef6d378078bce0baf2287ae14 < 25c2b77bc463f29ee71a54b883548baf9386a0dbaffected
LinuxLinux60b59beafba875aef6d378078bce0baf2287ae14 < a0aafb421dd15e935d81543152617f2742cefa70affected
LinuxLinux60b59beafba875aef6d378078bce0baf2287ae14 < 9ded47ad003f09a94b6a710b5c47f4aa5ceb7429affected
LinuxLinux2.6.22affected
LinuxLinux0 < 2.6.22unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.88 <= 6.12.*unaffected
LinuxLinux6.18.30 <= 6.18.*unaffected
LinuxLinux7.0.4 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References