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

Vulnerability from cvelistv5 – Published: 2026-09-29 12:02 – Updated: 2026-09-29 12:02
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
No CVSS data available.
Assigner
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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        }
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    "dateReserved": "2026-09-25T10:25:14.321Z",
    "dateUpdated": "2026-09-29T12:02:12.574Z",
    "state": "PUBLISHED"
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          }
        ],
        "id": "CVE-2026-98164",
        "lastModified": "2026-09-30T14:10:59.253",
        "metrics": {},
        "published": "2026-09-29T13:17:53.710",
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      "current_release_date": "2026-09-29T14:08:32+00:00",
      "cve": "CVE-2026-98164",
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      "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"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.