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CVE-2026-31600:
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CVE-2026-31600 | High Severity | Armis
CVE-2026-31600:
In the Linux kernel, the following vulnerability has been resolved:
arm64: mm: Handle invalid large leaf mappings correctly
It has been possible for a long time to mark ptes in the linear map as
invalid. This is done for secretmem, kfence, realm dma memory un/share,
and others, by simply clearing the PTE_VALID bit. But until commit
a166563e7ec37 ("arm64: mm: support large block mapping when
rodata=full") large leaf mappings were never made invalid in this way.
It turns out various parts of the code base are not equipped to handle
invalid large leaf mappings (in the way they are currently encoded) and
I've observed a kernel panic while booting a realm guest on a
BBML2_NOABORT system as a result:
A numerical rating that indicates how dangerous this vulnerability is.
7.5High
Published Date:Apr 24, 2026
CISA KEV Date:*No Data*
Industries Affected:20
Threat Predictions
EPSS Score:0.0
EPSS Percentile:11%
Exploitability
Score:3.9
Attack Vector:NETWORK
Attack Complexity:LOW
Privileges Required:NONE
User Interaction:NONE
Scope:UNCHANGED
Impact
Score:3.6
Confidentiality Impact:NONE
Integrity Impact:NONE
Availability Impact:HIGH
Description Preview
In the Linux kernel, the following vulnerability has been resolved:
arm64: mm: Handle invalid large leaf mappings correctly
It has been possible for a long time to mark ptes in the linear map as
invalid. This is done for secretmem, kfence, realm dma memory un/share,
and others, by simply clearing the PTE_VALID bit. But until commit
a166563e7ec37 ("arm64: mm: support large block mapping when
rodata=full") large leaf mappings were never made invalid in this way.
It turns out various parts of the code base are not equipped to handle
invalid large leaf mappings (in the way they are currently encoded) and
I've observed a kernel panic while booting a realm guest on a
BBML2_NOABORT system as a result:
