جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Re-translate VNCR before injecting abort KVM faults in the VNCR page with FOLL_WRITE whenever the guest aborts for a write, similar to how a regular stage-2 mapping is handled. It is entirely possible that the guest reads from the VNCR before writing to it, in which case the PFN could only be read-only. Invalidate the VNCR TLB and re-fetch the translation upon taking a VNCR abort, allowing the host mapping to be faulted in for write the second time around. Interestingly enough, this also satisfies the ordering requirements of FEAT_ETS2/3 between descriptor updates and MMU faults.

• https://git.kernel.org/stable/c/ea7a76d7d614b5f82b4d0785f9af3550e860a71a
• https://git.kernel.org/stable/c/0a5dd8cf4d58ea28da132c2097cd1c525302ac48
• https://git.kernel.org/stable/c/bb645aa0a4caeaf7f9cd32e9a948594d434c1a8f