linux: In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix host stage-2 PGD refcount The K...
CVE-2021-47450 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47450, released May 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix host stage-2 PGD refcount The KVM page-table library refcounts the pages of concatenated stage-2 PGDs individually. However, when running KVM in protected mode, the host's stage-2 PGD is currently managed by EL2 as a single high-order compound page, which can cause the refcount of the tail pages to reach 0 when they shouldn't, hence corrupting the page-table. Fix this by introducing a new hyp_split_page() helper in the EL2 page allocator (matching the kernel's split_page() function), and make use of it from host_s2_zalloc_pages_exact().
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 5.15.3-1 | DEBIAN-CVE-2021-47450 | May 22, 2024 |
| linux · Debian 13.5 (trixie) | 5.15.3-1 | DEBIAN-CVE-2021-47450 | May 22, 2024 |
| linux · Debian 14 | 5.15.3-1 | DEBIAN-CVE-2021-47450 | May 22, 2024 |
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