CVE-2026-98164 (GCVE-0-2026-98164)

Vulnerability from cvelistv5 – Published: 2026-09-29 12:02 – Updated: 2026-10-07 06:49
VLAI
Title
KVM: x86/mmu: Check write tracking in all address spaces
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Check write tracking in all address spaces kvm_gfn_is_write_tracked() checks only the supplied memslot, but page tracking is per-address-space and shadow pages are shared across all address spaces. With SMM, a GFN can therefore be write-tracked in one address space and appear untracked through the other. Check the supplied slot first, then the slot for the other address space. This ensures all callers honor write tracking regardless of the active address space. In particular, it prevents mmu_try_to_unsync_pages() from marking an upper-level shadow page unsync and eventually triggering the BUG in pte_list_remove(). [invert direction of the conditional. - Paolo]
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 699023e239658e62da6f42f47d31b54788521ec1 , < 09aa68552d2542cc6c23edd1568ac265dc5d886f (git)
Affected: 699023e239658e62da6f42f47d31b54788521ec1 , < 429b6f43b4d8c98988fdca99e02dc156134e3d77 (git)
Affected: 699023e239658e62da6f42f47d31b54788521ec1 , < d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a (git)
Affected: 699023e239658e62da6f42f47d31b54788521ec1 , < c0a9bd5fca0b5f2dea32b0fc31350e71e8648112 (git)
Affected: 699023e239658e62da6f42f47d31b54788521ec1 , < ec8fcaf354c1cbb36755d48e9f5a00c9591349e5 (git)
Affected: 699023e239658e62da6f42f47d31b54788521ec1 , < 0f38453cdb2e17566ccb7c0f3dabd5bd21caca26 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c0a9bd5fca0b5f2dea32b0fc31350e71e8648112"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ec8fcaf354c1cbb36755d48e9f5a00c9591349e5"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-670"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-17T22:02:32+00:00",
      "cve": "CVE-2026-98164",
      "id": "CVE-2026-98164",
      "initial_release_date": "2026-09-29T00:00:00+00:00",
      "product_status:known_affected": "235",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: x86/mmu: Check write tracking in all address spaces",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98164.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:02:18Z",
      "cve": "CVE-2026-98164",
      "id": "CVE-2026-98164",
      "initial_release_date": "2026-09-29T23:43:04Z",
      "product_status:known_affected": "682",
      "product_status:known_not_affected": "34",
      "product_status:recommended": "119",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98164",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98164.json",
      "version": "10"
    }
  }
}



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