Vulnerability-Lookup

GHSA-G73P-24RG-VMH3

Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts

When {de,en}crypting memory of an SEV or SEV-ES guest on an SNP-enabled host via a temporary buffer, allocate a full 4KiB page for the buffer to ensure the page containing the buffer is wholly owned by KVM, i.e. won't be concurrently allocated and accessed by other kernel code while KVM is using the buffer to {de,en}crypt memory. On SNP-enabled platforms, when sending SEV/SEV-ES commands that trigger firmware writes to memory, the to-be-written page(s) must be (temporarily) assigned to Firmware (as required by the SNP architecture, to guard against using such commands as gadgets to attack SNP guests). See snp_map_cmd_buf_desc() and friends.

Unfortunately, transferring ownership of a page to Firmware makes the page inaccessible to software, and thus writes generate RMP #PF violations. If KVM uses a sub-page allocation for its temporary buffer, some other actor in the kernel can allocate and use the other portions of the page, and thus trigger unexpected (and seemingly spurious) RMP #PF violations due to software attempting to access a Firmware-owned page.

BUG: unable to handle page fault for address: ffff906ae30f0300 #PF: supervisor write access in kernel mode #PF: error_code(0x80000003) - RMP violation PGD 6b1b80d067 P4D 6b1b80d067 PUD 100231e2063 PMD 10055a88063 PTE 80000100630f0163 SEV-SNP: PFN 0x100630f0 unassigned, dumping non-zero entries in 2M PFN region: [0x10063000 - 0x10063200] Oops: Oops: 0003 [#1] SMP CPU: 70 UID: 0 PID: 10658 Comm: svw_WaiterThrea Tainted: G U W O 7.1.0-smp--c22293789940-seanjc-next #1 PREEMPTLAZY Tainted: [U]=USER, [W]=WARN, [O]=OOT_MODULE Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 34.86.0-102 01/25/2026 RIP: 0010:memset+0xf/0x20 Call Trace: __kvmalloc_node_noprof+0x2a4/0x710 do_getxattr+0x4e/0x130 path_getxattrat+0x125/0x1b0 do_syscall_64+0x10a/0x480 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f3a22cb6daa Modules linked in: kvm_amd kvm irqbypass vfat fat ccp k10temp sha3 libsha3 i2c_piix4 gq(O) cdc_acm xhci_pci xhci_hcd gsmi: Log Shutdown Reason 0x03 CR2: ffff906ae30f0300 ---[ end trace 0000000000000000 ]--- RIP: 0010:memset+0xf/0x20 Kernel panic - not syncing: Fatal exception Kernel Offset: 0x39e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) gsmi: Log Shutdown Reason 0x02

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80853"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T16:18:14Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts\n\nWhen {de,en}crypting memory of an SEV or SEV-ES guest on an SNP-enabled\nhost via a temporary buffer, allocate a full 4KiB page for the buffer to\nensure the page containing the buffer is wholly owned by KVM, i.e. won\u0027t\nbe concurrently allocated and accessed by other kernel code while KVM is\nusing the buffer to {de,en}crypt memory.  On SNP-enabled platforms, when\nsending SEV/SEV-ES commands that trigger firmware writes to memory, the\nto-be-written page(s) must be (temporarily) assigned to Firmware (as\nrequired by the SNP architecture, to guard against using such commands as\ngadgets to attack SNP guests).  See snp_map_cmd_buf_desc() and friends.\n\nUnfortunately, transferring ownership of a page to Firmware makes the page\ninaccessible to software, and thus writes generate RMP #PF violations.  If\nKVM uses a sub-page allocation for its temporary buffer, some other actor\nin the kernel can allocate and use the other portions of the page, and thus\ntrigger unexpected (and seemingly spurious) RMP #PF violations due to\nsoftware attempting to access a Firmware-owned page.\n\n  BUG: unable to handle page fault for address: ffff906ae30f0300\n  #PF: supervisor write access in kernel mode\n  #PF: error_code(0x80000003) - RMP violation\n  PGD 6b1b80d067 P4D 6b1b80d067 PUD 100231e2063 PMD 10055a88063 PTE 80000100630f0163\n  SEV-SNP: PFN 0x100630f0 unassigned, dumping non-zero entries in 2M PFN region: [0x10063000 - 0x10063200]\n  Oops: Oops: 0003 [#1] SMP\n  CPU: 70 UID: 0 PID: 10658 Comm: svw_WaiterThrea Tainted: G     U  W  O        7.1.0-smp--c22293789940-seanjc-next #1 PREEMPTLAZY\n  Tainted: [U]=USER, [W]=WARN, [O]=OOT_MODULE\n  Hardware name: Google, Inc.                                                       Arcadia_IT_80/Arcadia_IT_80, BIOS 34.86.0-102 01/25/2026\n  RIP: 0010:memset+0xf/0x20\n  Call Trace:\n   \u003cTASK\u003e\n   __kvmalloc_node_noprof+0x2a4/0x710\n   do_getxattr+0x4e/0x130\n   path_getxattrat+0x125/0x1b0\n   do_syscall_64+0x10a/0x480\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n  RIP: 0033:0x7f3a22cb6daa\n   \u003c/TASK\u003e\n  Modules linked in: kvm_amd kvm irqbypass vfat fat ccp k10temp sha3 libsha3 i2c_piix4 gq(O) cdc_acm xhci_pci xhci_hcd\n  gsmi: Log Shutdown Reason 0x03\n  CR2: ffff906ae30f0300\n  ---[ end trace 0000000000000000 ]---\n  RIP: 0010:memset+0xf/0x20\n  Kernel panic - not syncing: Fatal exception\n  Kernel Offset: 0x39e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)\n  gsmi: Log Shutdown Reason 0x02",
  "id": "GHSA-g73p-24rg-vmh3",
  "modified": "2026-09-04T18:31:29Z",
  "published": "2026-09-04T18:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80853"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97f6402f5950ca3450541287c4b3664f3acda976"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a33c40b93ccf5177e042253807d40e0b92e7f206"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80853 (GCVE-0-2026-80853)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:55 – Updated: 2026-09-04 15:55

Title

KVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts When {de,en}crypting memory of an SEV or SEV-ES guest on an SNP-enabled host via a temporary buffer, allocate a full 4KiB page for the buffer to ensure the page containing the buffer is wholly owned by KVM, i.e. won't be concurrently allocated and accessed by other kernel code while KVM is using the buffer to {de,en}crypt memory. On SNP-enabled platforms, when sending SEV/SEV-ES commands that trigger firmware writes to memory, the to-be-written page(s) must be (temporarily) assigned to Firmware (as required by the SNP architecture, to guard against using such commands as gadgets to attack SNP guests). See snp_map_cmd_buf_desc() and friends. Unfortunately, transferring ownership of a page to Firmware makes the page inaccessible to software, and thus writes generate RMP #PF violations. If KVM uses a sub-page allocation for its temporary buffer, some other actor in the kernel can allocate and use the other portions of the page, and thus trigger unexpected (and seemingly spurious) RMP #PF violations due to software attempting to access a Firmware-owned page. BUG: unable to handle page fault for address: ffff906ae30f0300 #PF: supervisor write access in kernel mode #PF: error_code(0x80000003) - RMP violation PGD 6b1b80d067 P4D 6b1b80d067 PUD 100231e2063 PMD 10055a88063 PTE 80000100630f0163 SEV-SNP: PFN 0x100630f0 unassigned, dumping non-zero entries in 2M PFN region: [0x10063000 - 0x10063200] Oops: Oops: 0003 [#1] SMP CPU: 70 UID: 0 PID: 10658 Comm: svw_WaiterThrea Tainted: G U W O 7.1.0-smp--c22293789940-seanjc-next #1 PREEMPTLAZY Tainted: [U]=USER, [W]=WARN, [O]=OOT_MODULE Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 34.86.0-102 01/25/2026 RIP: 0010:memset+0xf/0x20 Call Trace: <TASK> __kvmalloc_node_noprof+0x2a4/0x710 do_getxattr+0x4e/0x130 path_getxattrat+0x125/0x1b0 do_syscall_64+0x10a/0x480 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f3a22cb6daa </TASK> Modules linked in: kvm_amd kvm irqbypass vfat fat ccp k10temp sha3 libsha3 i2c_piix4 gq(O) cdc_acm xhci_pci xhci_hcd gsmi: Log Shutdown Reason 0x03 CR2: ffff906ae30f0300 ---[ end trace 0000000000000000 ]--- RIP: 0010:memset+0xf/0x20 Kernel panic - not syncing: Fatal exception Kernel Offset: 0x39e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) gsmi: Log Shutdown Reason 0x02

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/97f6402f5950ca345…
https://git.kernel.org/stable/c/a33c40b93ccf5177e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4c735bf1bc22fd6ee66ab4bffe1d7599c3964781 , < 97f6402f5950ca3450541287c4b3664f3acda976 (git) Affected: 4c735bf1bc22fd6ee66ab4bffe1d7599c3964781 , < a33c40b93ccf5177e042253807d40e0b92e7f206 (git)
Linux	Linux	Affected: 7.2 Unaffected: 0 , < 7.2 (semver) Unaffected: 7.2.3 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "97f6402f5950ca3450541287c4b3664f3acda976",
              "status": "affected",
              "version": "4c735bf1bc22fd6ee66ab4bffe1d7599c3964781",
              "versionType": "git"
            },
            {
              "lessThan": "a33c40b93ccf5177e042253807d40e0b92e7f206",
              "status": "affected",
              "version": "4c735bf1bc22fd6ee66ab4bffe1d7599c3964781",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.2"
            },
            {
              "lessThan": "7.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.3",
                  "versionStartIncluding": "7.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "7.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts\n\nWhen {de,en}crypting memory of an SEV or SEV-ES guest on an SNP-enabled\nhost via a temporary buffer, allocate a full 4KiB page for the buffer to\nensure the page containing the buffer is wholly owned by KVM, i.e. won\u0027t\nbe concurrently allocated and accessed by other kernel code while KVM is\nusing the buffer to {de,en}crypt memory.  On SNP-enabled platforms, when\nsending SEV/SEV-ES commands that trigger firmware writes to memory, the\nto-be-written page(s) must be (temporarily) assigned to Firmware (as\nrequired by the SNP architecture, to guard against using such commands as\ngadgets to attack SNP guests).  See snp_map_cmd_buf_desc() and friends.\n\nUnfortunately, transferring ownership of a page to Firmware makes the page\ninaccessible to software, and thus writes generate RMP #PF violations.  If\nKVM uses a sub-page allocation for its temporary buffer, some other actor\nin the kernel can allocate and use the other portions of the page, and thus\ntrigger unexpected (and seemingly spurious) RMP #PF violations due to\nsoftware attempting to access a Firmware-owned page.\n\n  BUG: unable to handle page fault for address: ffff906ae30f0300\n  #PF: supervisor write access in kernel mode\n  #PF: error_code(0x80000003) - RMP violation\n  PGD 6b1b80d067 P4D 6b1b80d067 PUD 100231e2063 PMD 10055a88063 PTE 80000100630f0163\n  SEV-SNP: PFN 0x100630f0 unassigned, dumping non-zero entries in 2M PFN region: [0x10063000 - 0x10063200]\n  Oops: Oops: 0003 [#1] SMP\n  CPU: 70 UID: 0 PID: 10658 Comm: svw_WaiterThrea Tainted: G     U  W  O        7.1.0-smp--c22293789940-seanjc-next #1 PREEMPTLAZY\n  Tainted: [U]=USER, [W]=WARN, [O]=OOT_MODULE\n  Hardware name: Google, Inc.                                                       Arcadia_IT_80/Arcadia_IT_80, BIOS 34.86.0-102 01/25/2026\n  RIP: 0010:memset+0xf/0x20\n  Call Trace:\n   \u003cTASK\u003e\n   __kvmalloc_node_noprof+0x2a4/0x710\n   do_getxattr+0x4e/0x130\n   path_getxattrat+0x125/0x1b0\n   do_syscall_64+0x10a/0x480\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n  RIP: 0033:0x7f3a22cb6daa\n   \u003c/TASK\u003e\n  Modules linked in: kvm_amd kvm irqbypass vfat fat ccp k10temp sha3 libsha3 i2c_piix4 gq(O) cdc_acm xhci_pci xhci_hcd\n  gsmi: Log Shutdown Reason 0x03\n  CR2: ffff906ae30f0300\n  ---[ end trace 0000000000000000 ]---\n  RIP: 0010:memset+0xf/0x20\n  Kernel panic - not syncing: Fatal exception\n  Kernel Offset: 0x39e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)\n  gsmi: Log Shutdown Reason 0x02"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:55:05.021Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/97f6402f5950ca3450541287c4b3664f3acda976"
        },
        {
          "url": "https://git.kernel.org/stable/c/a33c40b93ccf5177e042253807d40e0b92e7f206"
        }
      ],
      "title": "KVM: SEV: Allocate full pages for {DE,EN}CRYPT ops on SNP-enabled hosts",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80853",
    "datePublished": "2026-09-04T15:55:05.021Z",
    "dateReserved": "2026-08-26T14:34:25.797Z",
    "dateUpdated": "2026-09-04T15:55:05.021Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-G73P-24RG-VMH3

CVE-2026-80853 (GCVE-0-2026-80853)

Tags

Sightings

Nomenclature