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CVE Vulnerability Details :
CVE-2026-43096
PUBLISHED
More InfoOfficial Page
Assigner-Linux
Assigner Org ID-416baaa9-dc9f-4396-8d5f-8c081fb06d67
View Known Exploited Vulnerability (KEV) details
Published At-06 May, 2026 | 07:40
Updated At-06 May, 2026 | 07:40
Rejected At-
▼CVE Numbering Authority (CNA)
mshv: Fix infinite fault loop on permission-denied GPA intercepts

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.

Affected Products
Vendor
Linux Kernel Organization, IncLinux
Product
Linux
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Program Files
  • drivers/hv/mshv_root_main.c
  • include/hyperv/hvgdk_mini.h
  • include/hyperv/hvhdk.h
Default Status
unaffected
Versions
Affected
  • From b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 before 02226839079ccc558820a3b25c4c46812927b4ba (git)
  • From b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 before 16cbec24897624051b324aa3a85859c38ca65fde (git)
Vendor
Linux Kernel Organization, IncLinux
Product
Linux
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Program Files
  • drivers/hv/mshv_root_main.c
  • include/hyperv/hvgdk_mini.h
  • include/hyperv/hvhdk.h
Default Status
affected
Versions
Affected
  • 6.19
Unaffected
  • From 0 before 6.19 (semver)
  • From 6.19.14 through 6.19.* (semver)
  • From 7.0 through * (original_commit_for_fix)
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

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Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://git.kernel.org/stable/c/02226839079ccc558820a3b25c4c46812927b4ba
N/A
https://git.kernel.org/stable/c/16cbec24897624051b324aa3a85859c38ca65fde
N/A
Hyperlink: https://git.kernel.org/stable/c/02226839079ccc558820a3b25c4c46812927b4ba
Resource: N/A
Hyperlink: https://git.kernel.org/stable/c/16cbec24897624051b324aa3a85859c38ca65fde
Resource: N/A
Details not found