Vulnerability-Lookup

GHSA-PJC6-4Q26-FRJF

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2

It is entirely possible for a guest to write to the ZCR_EL2 sysreg alias while in a nested context, as it is expected if FEAT_NV2 is advertised to the L1 hypervisor.

Get rid of the bogus WARN which, since the hyp vectors were installed at this point, has the effect of a hyp_panic...

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72280"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:58Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2\n\nIt is entirely possible for a guest to write to the ZCR_EL2 sysreg alias\nwhile in a nested context, as it is expected if FEAT_NV2 is advertised\nto the L1 hypervisor.\n\nGet rid of the bogus WARN which, since the hyp vectors were installed at\nthis point, has the effect of a hyp_panic...",
  "id": "GHSA-pjc6-4q26-frjf",
  "modified": "2026-08-17T06:33:21Z",
  "published": "2026-08-15T06:32:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72280"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5000bcae71c869cba6674c326fec2d8ad659ae3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6561597dba97e3e8479a9919bda172cf43eb902c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7deadbc5dab5b8e2316364603bc6281129c8461c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f1667098c6ae7ec81a9a56859cfdacb822aa0d0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72280 (GCVE-0-2026-72280)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42

Title

KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2 It is entirely possible for a guest to write to the ZCR_EL2 sysreg alias while in a nested context, as it is expected if FEAT_NV2 is advertised to the L1 hypervisor. Get rid of the bogus WARN which, since the hyp vectors were installed at this point, has the effect of a hyp_panic...

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/6561597dba97e3e84…
https://git.kernel.org/stable/c/5000bcae71c869cba…
https://git.kernel.org/stable/c/7deadbc5dab5b8e23…
https://git.kernel.org/stable/c/9f1667098c6ae7ec8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f , < 6561597dba97e3e8479a9919bda172cf43eb902c (git) Affected: 0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f , < 5000bcae71c869cba6674c326fec2d8ad659ae3a (git) Affected: 0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f , < 7deadbc5dab5b8e2316364603bc6281129c8461c (git) Affected: 0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f , < 9f1667098c6ae7ec81a9a56859cfdacb822aa0d0 (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/hyp/include/hyp/switch.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6561597dba97e3e8479a9919bda172cf43eb902c",
              "status": "affected",
              "version": "0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f",
              "versionType": "git"
            },
            {
              "lessThan": "5000bcae71c869cba6674c326fec2d8ad659ae3a",
              "status": "affected",
              "version": "0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f",
              "versionType": "git"
            },
            {
              "lessThan": "7deadbc5dab5b8e2316364603bc6281129c8461c",
              "status": "affected",
              "version": "0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f",
              "versionType": "git"
            },
            {
              "lessThan": "9f1667098c6ae7ec81a9a56859cfdacb822aa0d0",
              "status": "affected",
              "version": "0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/hyp/include/hyp/switch.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2\n\nIt is entirely possible for a guest to write to the ZCR_EL2 sysreg alias\nwhile in a nested context, as it is expected if FEAT_NV2 is advertised\nto the L1 hypervisor.\n\nGet rid of the bogus WARN which, since the hyp vectors were installed at\nthis point, has the effect of a hyp_panic..."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached when guest code in a nested KVM context executes an MSR/MRS to ZCR_EL2 that traps to EL2, traversing KVM_RUN \u2192 hyp fast-path kvm_hyp_handle_zcr_el2() \u2192 kvm_hyp_handle_fpsimd(); this requires local guest execution on an arm64 VHE KVM host, not remote network input.\nAC:L - On arm64 VHE hosts with nested virtualization (FEAT_NV2) and SVE enabled, a tenant guest in nested context (L1 non-hyp or L2) can deterministically issue the ZCR_EL2 access that hits the bogus WARN; the attacker controls the trap timing and FP/SVE lazy-switch preconditions without uncontrollable host races.\nPR:N - No host root or init-namespace capabilities are required\u2014exploitation needs only code execution inside an assigned KVM guest with nested virtualization and SVE enabled (typical nested-virt ARM cloud tenant), not privileged access on the physical host itself.\nUI:N - No victim user or administrator action is required beyond the attacker operating their own nested/SVE-enabled guest workload; triggering is fully automated via a single guest MSR to ZCR_EL2 that traps into the hypervisor fast path.\nS:C - A guest-triggered WARN in EL2 hypervisor code escalates to hyp_panic(), crashing the host kernel and denying all co-resident VMs\u2014crossing the guest-to-host KVM virtualization security boundary even though exploitation is denial-of-service rather than memory corruption.\nC:N - The failure mode is WARN_ON_ONCE \u2192 hyp_panic with no out-of-bounds access, use-after-free, or memory corruption; it is a deterministic hypervisor assertion panic without an information disclosure or memory-read primitive.\nI:N - No guest-controlled kernel memory write or control-flow hijack occurs; the bogus WARN aborts via hyp_panic before any exploitable state mutation beyond crashing the host, and the removed check was incorrectly rejecting a legitimate nested ZCR_EL2 write path.\nA:H - WARN_ON_ONCE in EL2 with hyp vectors installed invokes hyp_panic() and host panic(), immediately denying availability of the hypervisor and every VM on the affected arm64 KVM host; the attack is repeatable on each ZCR_EL2 trap while nested virt and SVE remain enabled."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:42:15.995Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6561597dba97e3e8479a9919bda172cf43eb902c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5000bcae71c869cba6674c326fec2d8ad659ae3a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7deadbc5dab5b8e2316364603bc6281129c8461c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f1667098c6ae7ec81a9a56859cfdacb822aa0d0"
        }
      ],
      "title": "KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72280",
    "datePublished": "2026-08-15T05:55:04.969Z",
    "dateReserved": "2026-08-09T03:40:39.916Z",
    "dateUpdated": "2026-08-17T05:42:15.995Z",
    "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-PJC6-4Q26-FRJF

CVE-2026-72280 (GCVE-0-2026-72280)

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Sightings

Nomenclature