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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
60b59beafba875aef6d378078bce0baf2287ae14 to < 4aab89603b637a2e441b38808c4f6fe7d1184df6affected60b59beafba875aef6d378078bce0baf2287ae14 to < 4fda0d6b45faad44926dd3e4f55f118d899b2e27affected60b59beafba875aef6d378078bce0baf2287ae14 to < 2a40f8bc9bb713329f1c35ffc199ee961a7135b0affected60b59beafba875aef6d378078bce0baf2287ae14 to < 2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066affected60b59beafba875aef6d378078bce0baf2287ae14 to < 25c2b77bc463f29ee71a54b883548baf9386a0dbaffected60b59beafba875aef6d378078bce0baf2287ae14 to < a0aafb421dd15e935d81543152617f2742cefa70affected60b59beafba875aef6d378078bce0baf2287ae14 to < 9ded47ad003f09a94b6a710b5c47f4aa5ceb7429affected
Linux Linux
Default version status: affected
2.6.22affected0 to < 2.6.22unaffected5.15.210 to ≤ 5.15.*unaffected6.1.176 to ≤ 6.1.*unaffected6.6.140 to ≤ 6.6.*unaffected6.12.88 to ≤ 6.12.*unaffected6.18.30 to ≤ 6.18.*unaffected7.0.4 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/4aab89603b637a2e441b38808c4f6fe7d1184df6 ↗
- https://git.kernel.org/stable/c/4fda0d6b45faad44926dd3e4f55f118d899b2e27 ↗
- 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://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗