Riskcovery

CVE-2026-98440

KVM: arm64: nv: Delay freeing of shadow S2 structures until VM destruction

State
Published
Severity
7.0 High
Published
Oct 18, 2026
Updated
Oct 24, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: nv: Delay freeing of shadow S2 structures until VM destruction

We free the shadow S2 structures from kvm_arch_flush_shadow_all(), which is a Bad Idea(tm). Freeing the page tables is fair game (this is what this callback is for), but freeing the container that could still be referenced by another part of the system is not great.

Instead, grow separate destructors that gets called when we tear the VM down for good. From there, we can nuke both the individual MMUs as well as the global array that points to them, safe in the knowledge that the vcpus themselves have been destroyed already.

Scores

CVSSScoreVectorSource
3.17.0 HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 to before 876049f026b4dfaca0cc78ec81be0e639ca8525dAffected
  • 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 to before 22e82acec93a681071ed36f70eabe2d0c4e0bebdAffected
  • 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 to before 5bf1c9175e657b3c2dc1cf77403031ac7aadcf66Affected
  • 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 to before e5843f4effaa2ffac3e789ecd4456403564961d4Affected
LinuxLinux
  • 6.11Affected
  • before 6.11Not affected
  • 6.12.113 through 6.12.*Not affected
  • 6.18.56 through 6.18.*Not affected
  • 7.2.9 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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