Vulnerability Details CVE-2021-47450
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().
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.1%
CVSS Severity
CVSS v3 Score 5.5
References
Products affected by CVE-2021-47450
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cpe:2.3:o:linux:linux_kernel:5.13
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cpe:2.3:o:linux:linux_kernel:5.13.0-52
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cpe:2.3:o:linux:linux_kernel:5.13.1
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cpe:2.3:o:linux:linux_kernel:5.13.10
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cpe:2.3:o:linux:linux_kernel:5.13.11
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cpe:2.3:o:linux:linux_kernel:5.13.12
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cpe:2.3:o:linux:linux_kernel:5.13.13
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cpe:2.3:o:linux:linux_kernel:5.13.14
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cpe:2.3:o:linux:linux_kernel:5.13.15
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cpe:2.3:o:linux:linux_kernel:5.13.16
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cpe:2.3:o:linux:linux_kernel:5.13.17
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cpe:2.3:o:linux:linux_kernel:5.13.18
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cpe:2.3:o:linux:linux_kernel:5.13.19
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cpe:2.3:o:linux:linux_kernel:5.13.2
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cpe:2.3:o:linux:linux_kernel:5.13.3
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cpe:2.3:o:linux:linux_kernel:5.13.4
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cpe:2.3:o:linux:linux_kernel:5.13.5
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cpe:2.3:o:linux:linux_kernel:5.13.6
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cpe:2.3:o:linux:linux_kernel:5.13.7
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cpe:2.3:o:linux:linux_kernel:5.13.8
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cpe:2.3:o:linux:linux_kernel:5.13.9
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cpe:2.3:o:linux:linux_kernel:5.14
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cpe:2.3:o:linux:linux_kernel:5.14.1
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cpe:2.3:o:linux:linux_kernel:5.14.10
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cpe:2.3:o:linux:linux_kernel:5.14.11
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cpe:2.3:o:linux:linux_kernel:5.14.12
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cpe:2.3:o:linux:linux_kernel:5.14.13
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cpe:2.3:o:linux:linux_kernel:5.14.14
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cpe:2.3:o:linux:linux_kernel:5.14.2
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cpe:2.3:o:linux:linux_kernel:5.14.3
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cpe:2.3:o:linux:linux_kernel:5.14.4
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cpe:2.3:o:linux:linux_kernel:5.14.5
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cpe:2.3:o:linux:linux_kernel:5.14.6
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cpe:2.3:o:linux:linux_kernel:5.14.7
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cpe:2.3:o:linux:linux_kernel:5.14.8
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cpe:2.3:o:linux:linux_kernel:5.14.9
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cpe:2.3:o:linux:linux_kernel:5.15