Description
In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Check write tracking in all address spaces kvm_gfn_is_write_tracked() checks only the supplied memslot, but page tracking is per-address-space and shadow pages are shared across all address spaces. With SMM, a GFN can therefore be write-tracked in one address space and appear untracked through the other. Check the supplied slot first, then the slot for the other address space. This ensures all callers honor write tracking regardless of the active address space. In particular, it prevents mmu_try_to_unsync_pages() from marking an upper-level shadow page unsync and eventually triggering the BUG in pte_list_remove(). [invert direction of the conditional. - Paolo]
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
699023e239658e62da6f42f47d31b54788521ec1 to < 09aa68552d2542cc6c23edd1568ac265dc5d886faffected699023e239658e62da6f42f47d31b54788521ec1 to < 429b6f43b4d8c98988fdca99e02dc156134e3d77affected699023e239658e62da6f42f47d31b54788521ec1 to < d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212aaffected699023e239658e62da6f42f47d31b54788521ec1 to < c0a9bd5fca0b5f2dea32b0fc31350e71e8648112affected699023e239658e62da6f42f47d31b54788521ec1 to < ec8fcaf354c1cbb36755d48e9f5a00c9591349e5affected699023e239658e62da6f42f47d31b54788521ec1 to < 0f38453cdb2e17566ccb7c0f3dabd5bd21caca26affected
Linux Linux
Default version status: affected
4.2affected0 to < 4.2unaffected6.1.187 to ≤ 6.1.*unaffected6.6.156 to ≤ 6.6.*unaffected6.12.108 to ≤ 6.12.*unaffected6.18.49 to ≤ 6.18.*unaffected7.1.13 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/09aa68552d2542cc6c23edd1568ac265dc5d886f ↗
- https://git.kernel.org/stable/c/429b6f43b4d8c98988fdca99e02dc156134e3d77 ↗
- https://git.kernel.org/stable/c/d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a ↗
- https://git.kernel.org/stable/c/c0a9bd5fca0b5f2dea32b0fc31350e71e8648112 ↗
- https://git.kernel.org/stable/c/ec8fcaf354c1cbb36755d48e9f5a00c9591349e5 ↗
- https://git.kernel.org/stable/c/0f38453cdb2e17566ccb7c0f3dabd5bd21caca26 ↗