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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 60b59beafba875aef6d378078bce0baf2287ae14, < 4aab89603b637a2e441b38808c4f6fe7d1184df6; >= 60b59beafba875aef6d378078bce0baf2287ae14, < 4fda0d6b45faad44926dd3e4f55f118d899b2e27; >= 60b59beafba875aef6d378078bce0baf2287ae14, < 2a40f8bc9bb713329f1c35ffc199ee961a7135b0; >= 60b59beafba875aef6d378078bce0baf2287ae14, < 2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066; >= 60b59beafba875aef6d378078bce0baf2287ae14, < 25c2b77bc463f29ee71a54b883548baf9386a0db; >= 60b59beafba875aef6d378078bce0baf2287ae14, < a0aafb421dd15e935d81543152617f2742cefa70; >= 60b59beafba875aef6d378078bce0baf2287ae14, < 9ded47ad003f09a94b6a710b5c47f4aa5ceb7429 |
| Linux | Linux | 2.6.22 |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | < * |
References
- https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0dbPatch
- https://git.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0Patch
- https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066Patch
- https://git.kernel.org/stable/c/4aab89603b637a2e441b38808c4f6fe7d1184df6Patch
- https://git.kernel.org/stable/c/4fda0d6b45faad44926dd3e4f55f118d899b2e27Patch
- https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429Patch
- https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70Patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Timeline
- Published
- May 27, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Undergoing Analysis