CVE-2022-49098
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Fix potential crash on module unload The vmbus driver relies on the pan…
Impact
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Fix potential crash on module unload The vmbus driver relies on the panic notifier infrastructure to perform some operations when a panic event is detected. Since vmbus can be built as module, it is required that the driver handles both registering and unregistering such panic notifier callback. After commit 74347a99e73a ("x86/Hyper-V: Unload vmbus channel in hv panic callback") though, the panic notifier registration is done unconditionally in the module initialization routine whereas the unregistering procedure is conditionally guarded and executes only if HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE capability is set. This patch fixes that by unconditionally unregistering the panic notifier in the module's exit routine as well.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 4.19.118 before 4.19.238 from 5.4.35 before 5.4.189 from 5.6.7 before 5.7 from 5.7.1 before 5.10.111 from 5.11 before 5.15.34 from 5.16 before 5.16.20 |
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/2133c422a103cf7c7768c37b9ac382e73b691892
- https://git.kernel.org/stable/c/3d0078f8bddd58d9bb1ad40bbe929f8633abb276
- https://git.kernel.org/stable/c/5ea98d0f5f035c1bcf1517ccec0e024ae35a48b2
- https://git.kernel.org/stable/c/6b4c0149a56147b29169e07000d566162892722a
- https://git.kernel.org/stable/c/792f232d57ff28bbd5f9c4abe0466b23d5879dc8
- https://git.kernel.org/stable/c/cf580d2e3884dbafd6b90269b03a24d661578624
- https://git.kernel.org/stable/c/dcd6b1a624c0ffa21034d8b1e02e9d068458f596