{"id":"CVE-2026-98440","title":"KVM: arm64: nv: Delay freeing of shadow S2 structures until VM destruction","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Delay freeing of shadow S2 structures until VM destruction\n\nWe free the shadow S2 structures from kvm_arch_flush_shadow_all(), which\nis a Bad Idea(tm). …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 < 876049f026b4dfaca0cc78ec81be0e639ca8525d","Linux >= 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 < 22e82acec93a681071ed36f70eabe2d0c4e0bebd","Linux >= 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 < 5bf1c9175e657b3c2dc1cf77403031ac7aadcf66","Linux >= 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 < e5843f4effaa2ffac3e789ecd4456403564961d4","Linux 6.11"],"published":"2026-10-18","updated":"2026-10-19","sourceUpdated":"2026-10-19T09:19:36.072Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98440","references":[{"url":"https://git.kernel.org/stable/c/876049f026b4dfaca0cc78ec81be0e639ca8525d"},{"url":"https://git.kernel.org/stable/c/22e82acec93a681071ed36f70eabe2d0c4e0bebd"},{"url":"https://git.kernel.org/stable/c/5bf1c9175e657b3c2dc1cf77403031ac7aadcf66"},{"url":"https://git.kernel.org/stable/c/e5843f4effaa2ffac3e789ecd4456403564961d4"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T15:45:12.307Z","slug":"CVE-2026-98440","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Delay freeing of shadow S2 structures until VM destruction\n\nWe free the shadow S2 structures from kvm_arch_flush_shadow_all(), which\nis a Bad Idea(tm). Freeing the page tables is fair game (this is what\nthis callback is for), but freeing the container that could still be\nreferenced by another part of the system is not great.\n\nInstead, grow separate destructors that gets called when we tear the VM\ndown for good. From there, we can nuke both the individual MMUs as well\nas the global array that points to them, safe in the knowledge that the\nvcpus themselves have been destroyed already.\n\n## Affected\n\n- `Linux >= 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 < 876049f026b4dfaca0cc78ec81be0e639ca8525d`\n- `Linux >= 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 < 22e82acec93a681071ed36f70eabe2d0c4e0bebd`\n- `Linux >= 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 < 5bf1c9175e657b3c2dc1cf77403031ac7aadcf66`\n- `Linux >= 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 < e5843f4effaa2ffac3e789ecd4456403564961d4`\n- `Linux 6.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}