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CVE-2026-52969 (GCVE-0-2026-52969)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-07-15 02:48
VLAI
Title
KVM: Reject wrapped offset in kvm_reset_dirty_gfn()
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: Reject wrapped offset in kvm_reset_dirty_gfn() kvm_reset_dirty_gfn() guards the gfn range with if (!memslot || (offset + __fls(mask)) >= memslot->npages) return; but offset is u64 and the addition is unchecked. The check can be silently bypassed by a u64 wrap. The dirty ring backing those entries is MAP_SHARED at KVM_DIRTY_LOG_PAGE_OFFSET of the vcpu fd, so the VMM can rewrite the slot and offset fields of any entry between when the kernel pushes them and when KVM_RESET_DIRTY_RINGS consumes them. On reset, kvm_dirty_ring_reset() re-reads the values via READ_ONCE() and feeds them straight back into this check; only the flags handshake is treated as the handover, the slot/offset payload is taken on trust. Crafting two entries entry[i].offset = 0xffffffffffffffc1 entry[i+1].offset = 0 makes the coalescing loop in kvm_dirty_ring_reset() compute delta = (s64)(0 - 0xffffffffffffffc1) = 63 which falls in [0, BITS_PER_LONG), so it folds entry[i+1] into the existing mask by setting bit 63. The trailing kvm_reset_dirty_gfn() call then sees offset = 0xffffffffffffffc1 and __fls(mask) = 63; the sum is 0 in u64 and the bounds check passes. That offset propagates into kvm_arch_mmu_enable_log_dirty_pt_masked() unchanged. On the legacy MMU path -- kvm_memslots_have_rmaps() == true, i.e. shadow paging, any VM that has allocated shadow roots, or a write-tracked slot -- it reaches gfn_to_rmap(), which indexes slot->arch.rmap[0][] with a near-U64_MAX gfn. That is an out-of-bounds load of a kvm_rmap_head, followed by a conditional clear of PT_WRITABLE_MASK in whatever the loaded pointer points at. The path is reachable from any process holding /dev/kvm. Range-check offset on its own first, so the addition cannot wrap. memslot->npages is bounded well below U64_MAX, so once offset < npages holds, offset + __fls(mask) (with __fls(mask) < BITS_PER_LONG) stays in range.
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-190 - Integer Overflow or Wraparound
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fb04a1eddb1a65b6588a021bdc132270d5ae48bb , < 74f1a22f7a80f03d28ad8551a2d25d563433addf (git)
Affected: fb04a1eddb1a65b6588a021bdc132270d5ae48bb , < 0eb281eb95b2d4eea4db1da5fe91023aecc97095 (git)
Affected: fb04a1eddb1a65b6588a021bdc132270d5ae48bb , < 01b71b930f15728aa8599478a7ce90c19dcd9fc2 (git)
Affected: fb04a1eddb1a65b6588a021bdc132270d5ae48bb , < b315b033a877b1ee6d827810b5d7bb4392ffcf8d (git)
Affected: fb04a1eddb1a65b6588a021bdc132270d5ae48bb , < 0d419c23bb11b5c9664de777c47c1f04a235882d (git)
Affected: fb04a1eddb1a65b6588a021bdc132270d5ae48bb , < ecf9b3ea7847fe14f34b8c41f00de1eb95c747da (git)
Affected: fb04a1eddb1a65b6588a021bdc132270d5ae48bb , < 577a8d3bae0531f0e5ccfac919cd8192f920a804 (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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range.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"virt/kvm/dirty_ring.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"fb04a1eddb1a65b6588a021bdc132270d5ae48bb\",\"lessThan\":\"74f1a22f7a80f03d28ad8551a2d25d563433addf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fb04a1eddb1a65b6588a021bdc132270d5ae48bb\",\"lessThan\":\"0eb281eb95b2d4eea4db1da5fe91023aecc97095\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fb04a1eddb1a65b6588a021bdc132270d5ae48bb\",\"lessThan\":\"01b71b930f15728aa8599478a7ce90c19dcd9fc2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fb04a1eddb1a65b6588a021bdc132270d5ae48bb\",\"lessThan\":\"b315b033a877b1ee6d827810b5d7bb4392ffcf8d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fb04a1eddb1a65b6588a021bdc132270d5ae48bb\",\"lessThan\":\"0d419c23bb11b5c9664de777c47c1f04a235882d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fb04a1eddb1a65b6588a021bdc132270d5ae48bb\",\"lessThan\":\"ecf9b3ea7847fe14f34b8c41f00de1eb95c747da\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fb04a1eddb1a65b6588a021bdc132270d5ae48bb\",\"lessThan\":\"577a8d3bae0531f0e5ccfac919cd8192f920a804\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"virt/kvm/dirty_ring.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red 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Party Advisory\"]},{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=2492434\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52969.json\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-15T01:25:51+00:00",
      "cve": "CVE-2026-52969",
      "id": "CVE-2026-52969",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: Reject wrapped offset in kvm_reset_dirty_gfn()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52969.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T16:31:11Z",
      "cve": "CVE-2026-52969",
      "id": "CVE-2026-52969",
      "initial_release_date": "2026-06-26T02:14:26Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "204",
      "product_status:recommended": "442",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52969",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52969.json",
      "version": "11"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.