Vulnerability Details CVE-2026-43096
In the Linux kernel, the following vulnerability has been resolved:
mshv: Fix infinite fault loop on permission-denied GPA intercepts
Prevent infinite fault loops when guests access memory regions without
proper permissions. Currently, mshv_handle_gpa_intercept() attempts to
remap pages for all faults on movable memory regions, regardless of
whether the access type is permitted. When a guest writes to a read-only
region, the remap succeeds but the region remains read-only, causing
immediate re-fault and spinning the vCPU indefinitely.
Validate intercept access type against region permissions before
attempting remaps. Reject writes to non-writable regions and executes to
non-executable regions early, returning false to let the VMM handle the
intercept appropriately.
This also closes a potential DoS vector where malicious guests could
intentionally trigger these fault loops to consume host resources.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.5%
CVSS Severity
CVSS v3 Score 5.5
References
Products affected by CVE-2026-43096
-
cpe:2.3:o:linux:linux_kernel:6.19
-
cpe:2.3:o:linux:linux_kernel:6.19.1
-
cpe:2.3:o:linux:linux_kernel:6.19.10
-
cpe:2.3:o:linux:linux_kernel:6.19.11
-
cpe:2.3:o:linux:linux_kernel:6.19.12
-
cpe:2.3:o:linux:linux_kernel:6.19.13
-
cpe:2.3:o:linux:linux_kernel:6.19.3
-
cpe:2.3:o:linux:linux_kernel:6.19.4
-
cpe:2.3:o:linux:linux_kernel:6.19.6
-
cpe:2.3:o:linux:linux_kernel:6.19.7
-
cpe:2.3:o:linux:linux_kernel:6.19.8
-
cpe:2.3:o:linux:linux_kernel:6.19.9
-
cpe:2.3:o:linux:linux_kernel:7.0