CVE-2026-64104 (GCVE-0-2026-64104)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
virt: sev-guest: Explicitly leak pages in unknown state
Summary
In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Explicitly leak pages in unknown state When set_memory_{encrypted,decrypted}() fail, the user cannot know at which point the function failed, meaning that the pages are left in an unknown state from the point of view of the caller. Since the pages may be left in an unencrypted state, they are not suitable for general use, and cannot be returned safely to the buddy allocator. Avoid the issue by never freeing the pages, and then do the proper accounting by calling snp_leak_pages().
Severity
8.7 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3e385c0d6ce88ac9916dcf84267bd5855d830748 , < bee400ad4f4259c9c0758e4f1960a1eed6f6f9f0 (git)
Affected: 3e385c0d6ce88ac9916dcf84267bd5855d830748 , < 3d0cd0065deeb054b4b29236432e851806b7cc81 (git)
Affected: 3e385c0d6ce88ac9916dcf84267bd5855d830748 , < fd948c3f96b18ff9ba7d3e8eae13d196593e1aaf (git)
Affected: 0b16521f95c875e79d657cb8d6911c15080dbb80 (git)
Affected: 6.13.8 , < 6.14 (semver)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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            "drivers/virt/coco/sev-guest/sev-guest.c"
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        }
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    "datePublished": "2026-07-19T15:40:07.994Z",
    "dateReserved": "2026-07-19T07:54:57.034Z",
    "dateUpdated": "2026-07-20T13:43:21.343Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:04:36+00:00",
      "cve": "CVE-2026-64104",
      "id": "CVE-2026-64104",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: virt: sev-guest: Explicitly leak pages in unknown state",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64104.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

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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.


Detection rules are retrieved from Rulezet.