CVE-2026-53359 (GCVE-0-2026-53359)

Vulnerability from cvelistv5 – Published: 2026-07-04 11:51 – Updated: 2026-08-05 12:35
VLAI
Title
KVM: x86: Fix shadow paging use-after-free due to unexpected role
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a shadow paging mismatch between stored and computed GFNs; the bug could be triggered by changing a PDE mapping from outside the guest, and then deleting a memslot. The rmap_remove() call would miss entries created after the PDE change because the GFN of the leaf SPTE does not match the GFN of the struct kvm_mmu_page. A similar hole however remains if the modified PDE points to a non-leaf page. In this case the gfn can be made to match, but the role does not match: the original large 2MB page creates a kvm_mmu_page with direct=1, while the new 4KB needs a kvm_mmu_page with direct=0. However, kvm_mmu_get_child_sp() does not compare the role, and therefore reuses the page. The next step is installing a leaf (4KB) SPTE on the new path which records an rmap entry under the gfn resolved by the walk. But when that child is zapped its parent kvm_mmu_page has direct=1 and kvm_mmu_page_get_gfn() computes the gfn for the 4KB page as sp->gfn + index instead of using sp->shadowed_translation[] (or sp->gfns[] in older kernels). It therefore fails to remove the recorded entry. When the memslot is dropped the shadow page is freed but the rmap entry survives, as in the scenario that was already fixed. Code that later walks that gfn (dirty logging, MMU notifier invalidation, and so on) dereferences an sptep that lies in the freed page, causing the use-after-free.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < b1337aae5e194324e4810d561764e7793f8b3864 (git)
Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 9291654d69e08542de37755cebe4d5b02c3170d1 (git)
Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 2ad3afa40ac6aa340dada122f9abfa46c0a6eb35 (git)
Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 5e470998a23e4c3d89ed24e8172cb22747e61efa (git)
Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 1ae7d5a6db6c190ce183e3098ca0e0846e14d462 (git)
Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb (git)
Create a notification for this product.
Linux Linux Affected: 2.6.36
Unaffected: 0 , < 2.6.36 (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Fix shadow paging use-after-free due to unexpected role\n\nCommit 0cb2af2ea66ad (\"KVM: x86: Fix shadow paging use-after-free due\nto unexpected GFN\") fixed a shadow paging mismatch between stored and\ncomputed GFNs; the bug could be triggered by changing a PDE mapping from\noutside the guest, and then deleting a memslot.  The rmap_remove()\ncall would miss entries created after the PDE change because the GFN\nof the leaf SPTE does not match the GFN of the struct kvm_mmu_page.\n\nA similar hole however remains if the modified PDE points to a non-leaf\npage.  In this case the gfn can be made to match, but the role does not\nmatch: the original large 2MB page creates a kvm_mmu_page with direct=1,\nwhile the new 4KB needs a kvm_mmu_page with direct=0.  However,\nkvm_mmu_get_child_sp() does not compare the role, and therefore reuses\nthe page.\n\nThe next step is installing a leaf (4KB) SPTE on the new path which\nrecords an rmap entry under the gfn resolved by the walk.  But when\nthat child is zapped its parent kvm_mmu_page has direct=1 and\nkvm_mmu_page_get_gfn() computes the gfn for the 4KB page as\nsp-\u003egfn + index instead of using sp-\u003eshadowed_translation[] (or sp-\u003egfns[]\nin older kernels).  It therefore fails to remove the recorded entry.\n\nWhen the memslot is dropped the shadow page is freed but the rmap\nentry survives, as in the scenario that was already fixed.  Code that\nlater walks that gfn (dirty logging, MMU notifier invalidation, and\nso on) dereferences an sptep that lies in the freed page, causing the\nuse-after-free."
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In this case the gfn can be made to match, but the role does not\\nmatch: the original large 2MB page creates a kvm_mmu_page with direct=1,\\nwhile the new 4KB needs a kvm_mmu_page with direct=0.  However,\\nkvm_mmu_get_child_sp() does not compare the role, and therefore reuses\\nthe page.\\n\\nThe next step is installing a leaf (4KB) SPTE on the new path which\\nrecords an rmap entry under the gfn resolved by the walk.  But when\\nthat child is zapped its parent kvm_mmu_page has direct=1 and\\nkvm_mmu_page_get_gfn() computes the gfn for the 4KB page as\\nsp-\u003egfn + index instead of using sp-\u003eshadowed_translation[] (or sp-\u003egfns[]\\nin older kernels).  It therefore fails to remove the recorded entry.\\n\\nWhen the memslot is dropped the shadow page is freed but the rmap\\nentry survives, as in the scenario that was already fixed.  Code that\\nlater walks that gfn (dirty logging, MMU notifier invalidation, and\\nso on) dereferences an sptep that lies in the freed page, causing 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-31T20:30:03+00:00",
      "cve": "CVE-2026-53359",
      "id": "CVE-2026-53359",
      "initial_release_date": "2026-07-04T00:00:00+00:00",
      "product_status:fixed": "2142",
      "product_status:known_affected": "50",
      "product_status:known_not_affected": "15",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53359.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-07T23:49:15Z",
      "cve": "CVE-2026-53359",
      "id": "CVE-2026-53359",
      "initial_release_date": "2026-07-05T01:58:45Z",
      "product_status:first_fixed": "25",
      "product_status:known_affected": "488",
      "product_status:recommended": "769",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53359",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53359.json",
      "version": "22"
    },
    "vulnrichment": {
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In the highest reasonable scenario, an attacker runs code in a guest on an x86 KVM host with shadow paging/nested virtualization exposed.\\nAC:L - The bug is a deterministic role-confusion/use-after-free in shadow page reuse, and the attacker can drive the guest mapping changes and later rmap walks needed to hit it. No condition outside attacker influence is required once the vulnerable KVM configuration is present.\\nPR:L - The attacker needs the ability to run code in a KVM guest or otherwise access KVM VM execution interfaces, but does not need host root or administrative privileges. This is low privilege relative to the host security boundary.\\nUI:N - No victim user action is required after the attacker-controlled guest or KVM workload is running. The trigger is caused by guest execution and KVM memory-management operations.\\nS:C - This is a KVM guest-to-host escape class vulnerability, crossing from the guest security authority into the host kernel/hypervisor. Compromise can affect resources outside the guest\\u2019s own scope.\\nC:H - The stale rmap entry dereferences an SPTE pointer in freed shadow-page memory, creating a kernel use-after-free. Such memory corruption can be leveraged for host kernel information disclosure and arbitrary memory access.\\nI:H - The use-after-free can corrupt host kernel shadow-MMU/rmap state and provides a plausible path to host kernel code execution or arbitrary modification. Public analysis treats this as a KVM escape class issue, so high integrity impact is defensible.\\nA:H - At minimum, walking the stale rmap can dereference freed memory and crash or panic the host kernel. A malicious guest can repeatedly trigger the condition, causing high availability impact to the host and colocated guests.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2032a93d66fa282ba0f2ea9152eeff9511fa9a96\", \"lessThan\": \"b1337aae5e194324e4810d561764e7793f8b3864\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2032a93d66fa282ba0f2ea9152eeff9511fa9a96\", \"lessThan\": \"9291654d69e08542de37755cebe4d5b02c3170d1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2032a93d66fa282ba0f2ea9152eeff9511fa9a96\", \"lessThan\": \"2ad3afa40ac6aa340dada122f9abfa46c0a6eb35\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2032a93d66fa282ba0f2ea9152eeff9511fa9a96\", \"lessThan\": \"5e470998a23e4c3d89ed24e8172cb22747e61efa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2032a93d66fa282ba0f2ea9152eeff9511fa9a96\", \"lessThan\": \"1ae7d5a6db6c190ce183e3098ca0e0846e14d462\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2032a93d66fa282ba0f2ea9152eeff9511fa9a96\", \"lessThan\": \"81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb\", \"versionType\": \"git\"}], \"programFiles\": [\"arch/x86/kvm/mmu/mmu.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.36\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.36\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.177\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.144\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.95\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.38\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2-rc1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/x86/kvm/mmu/mmu.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b1337aae5e194324e4810d561764e7793f8b3864\"}, {\"url\": \"https://git.kernel.org/stable/c/9291654d69e08542de37755cebe4d5b02c3170d1\"}, {\"url\": \"https://git.kernel.org/stable/c/2ad3afa40ac6aa340dada122f9abfa46c0a6eb35\"}, {\"url\": \"https://git.kernel.org/stable/c/5e470998a23e4c3d89ed24e8172cb22747e61efa\"}, {\"url\": \"https://git.kernel.org/stable/c/1ae7d5a6db6c190ce183e3098ca0e0846e14d462\"}, {\"url\": \"https://git.kernel.org/stable/c/81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: x86: Fix shadow paging use-after-free due to unexpected role\\n\\nCommit 0cb2af2ea66ad (\\\"KVM: x86: Fix shadow paging use-after-free due\\nto unexpected GFN\\\") fixed a shadow paging mismatch between stored and\\ncomputed GFNs; the bug could be triggered by changing a PDE mapping from\\noutside the guest, and then deleting a memslot.  The rmap_remove()\\ncall would miss entries created after the PDE change because the GFN\\nof the leaf SPTE does not match the GFN of the struct kvm_mmu_page.\\n\\nA similar hole however remains if the modified PDE points to a non-leaf\\npage.  In this case the gfn can be made to match, but the role does not\\nmatch: the original large 2MB page creates a kvm_mmu_page with direct=1,\\nwhile the new 4KB needs a kvm_mmu_page with direct=0.  However,\\nkvm_mmu_get_child_sp() does not compare the role, and therefore reuses\\nthe page.\\n\\nThe next step is installing a leaf (4KB) SPTE on the new path which\\nrecords an rmap entry under the gfn resolved by the walk.  But when\\nthat child is zapped its parent kvm_mmu_page has direct=1 and\\nkvm_mmu_page_get_gfn() computes the gfn for the 4KB page as\\nsp-\u003egfn + index instead of using sp-\u003eshadowed_translation[] (or sp-\u003egfns[]\\nin older kernels).  It therefore fails to remove the recorded entry.\\n\\nWhen the memslot is dropped the shadow page is freed but the rmap\\nentry survives, as in the scenario that was already fixed.  Code that\\nlater walks that gfn (dirty logging, MMU notifier invalidation, and\\nso on) dereferences an sptep that lies in the freed page, causing the\\nuse-after-free.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.177\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.144\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.95\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.38\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.3\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2-rc1\", \"versionStartIncluding\": \"2.6.36\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:35:08.798Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-53359\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T12:35:08.798Z\", \"dateReserved\": \"2026-06-09T07:44:35.400Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-04T11:51:49.052Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.