Vulnerability-Lookup

GHSA-2RQC-J7RG-XG47

Vulnerability from github – Published: 2026-07-24 18:31 – Updated: 2026-07-27 06:30

Details

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

KVM: x86: hyper-v: Bound the bank index when querying sparse banks

When checking if a VP ID is included in a sparse bank set, explicitly check that the ID can actually be contained in a sparse bank (the TLFS allows for a maximum of 64 banks of 64 vCPUs each). When handling a paravirtual TLB flush for L2, the VP ID is copied verbatim from the enlightened VMCS, without any bounds check, i.e. isn't guaranteed to be under the limit of 4096.

Failure to check the bounds of the VP ID leads to an out-of-bounds read when testing the sparse bank, and super strictly speaking could lead to KVM performing an unnecessary TLB flush for an L2 vCPU.

================================================================== BUG: KASAN: use-after-free in hv_is_vp_in_sparse_set+0x85/0x100 [kvm] Read of size 8 at addr ffff88811ba5f598 by task hyperv_evmcs/2802

CPU: 12 UID: 1000 PID: 2802 Comm: hyperv_evmcs Not tainted 7.1.0-rc2 #7 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 Call Trace: dump_stack_lvl+0x51/0x60 print_report+0xcb/0x5d0 kasan_report+0xb4/0xe0 kasan_check_range+0x35/0x1b0 hv_is_vp_in_sparse_set+0x85/0x100 [kvm] kvm_hv_flush_tlb+0xe9e/0x16c0 [kvm] kvm_hv_hypercall+0xe6b/0x1e60 [kvm] vmx_handle_exit+0x485/0x1b60 [kvm_intel] kvm_arch_vcpu_ioctl_run+0x22e3/0x5070 [kvm] kvm_vcpu_ioctl+0x5d0/0x10c0 [kvm] __x64_sys_ioctl+0x129/0x1a0 do_syscall_64+0xb9/0xcf0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f0e62d1a9bf

The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x11ba5f flags: 0x4000000000000000(zone=1) raw: 4000000000000000 0000000000000000 00000000ffffffff 0000000000000000 raw: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected

Memory state around the buggy address: ffff88811ba5f480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811ba5f500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ffff88811ba5f580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811ba5f600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811ba5f680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Disabling lock debugging due to kernel taint

Opportunistically add a compile time assertion to ensure the maximum number of sparse banks exactly matches the number of possible bits in the passed in mask.

[sean: add KASAN splat, drop comment, add assert, massage changelog]

Severity

8.4 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64247"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-24T16:16:54Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: hyper-v: Bound the bank index when querying sparse banks\n\nWhen checking if a VP ID is included in a sparse bank set, explicitly check\nthat the ID can actually be contained in a sparse bank (the TLFS allows for\na maximum of 64 banks of 64 vCPUs each).  When handling a paravirtual TLB\nflush for L2, the VP ID is copied verbatim from the enlightened VMCS,\nwithout any bounds check, i.e. isn\u0027t guaranteed to be under the limit of\n4096.\n\nFailure to check the bounds of the VP ID leads to an out-of-bounds read\nwhen testing the sparse bank, and super strictly speaking could lead to KVM\nperforming an unnecessary TLB flush for an L2 vCPU.\n\n  ==================================================================\n  BUG: KASAN: use-after-free in hv_is_vp_in_sparse_set+0x85/0x100 [kvm]\n  Read of size 8 at addr ffff88811ba5f598 by task hyperv_evmcs/2802\n\n  CPU: 12 UID: 1000 PID: 2802 Comm: hyperv_evmcs Not tainted 7.1.0-rc2 #7 PREEMPT\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x51/0x60\n   print_report+0xcb/0x5d0\n   kasan_report+0xb4/0xe0\n   kasan_check_range+0x35/0x1b0\n   hv_is_vp_in_sparse_set+0x85/0x100 [kvm]\n   kvm_hv_flush_tlb+0xe9e/0x16c0 [kvm]\n   kvm_hv_hypercall+0xe6b/0x1e60 [kvm]\n   vmx_handle_exit+0x485/0x1b60 [kvm_intel]\n   kvm_arch_vcpu_ioctl_run+0x22e3/0x5070 [kvm]\n   kvm_vcpu_ioctl+0x5d0/0x10c0 [kvm]\n   __x64_sys_ioctl+0x129/0x1a0\n   do_syscall_64+0xb9/0xcf0\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n  RIP: 0033:0x7f0e62d1a9bf\n   \u003c/TASK\u003e\n\n  The buggy address belongs to the physical page:\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x11ba5f\n  flags: 0x4000000000000000(zone=1)\n  raw: 4000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n  raw: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000\n  page dumped because: kasan: bad access detected\n\n  Memory state around the buggy address:\n   ffff88811ba5f480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n   ffff88811ba5f500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n  \u003effff88811ba5f580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n                              ^\n   ffff88811ba5f600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n   ffff88811ba5f680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n  ==================================================================\n  Disabling lock debugging due to kernel taint\n\nOpportunistically add a compile time assertion to ensure the maximum number\nof sparse banks exactly matches the number of possible bits in the passed\nin mask.\n\n[sean: add KASAN splat, drop comment, add assert, massage changelog]",
  "id": "GHSA-2rqc-j7rg-xg47",
  "modified": "2026-07-27T06:30:30Z",
  "published": "2026-07-24T18:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64247"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4721f8160f17554b003e8928bb61e6c9b2fe92a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83c2f52c6a78b1590034e955cff3fe0b052fe4ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d18756b12aab30d07794446445c93112e5c69a2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e36095d8d922bb26ce860231aacf0cd14edea07c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f636cf6a1e7b7f40d48d8d08bd5f152aa61dd130"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-64247 (GCVE-0-2026-64247)

Vulnerability from cvelistv5 – Published: 2026-07-24 15:31 – Updated: 2026-07-27 04:59

Title

KVM: x86: hyper-v: Bound the bank index when querying sparse banks

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: hyper-v: Bound the bank index when querying sparse banks When checking if a VP ID is included in a sparse bank set, explicitly check that the ID can actually be contained in a sparse bank (the TLFS allows for a maximum of 64 banks of 64 vCPUs each). When handling a paravirtual TLB flush for L2, the VP ID is copied verbatim from the enlightened VMCS, without any bounds check, i.e. isn't guaranteed to be under the limit of 4096. Failure to check the bounds of the VP ID leads to an out-of-bounds read when testing the sparse bank, and super strictly speaking could lead to KVM performing an unnecessary TLB flush for an L2 vCPU. ================================================================== BUG: KASAN: use-after-free in hv_is_vp_in_sparse_set+0x85/0x100 [kvm] Read of size 8 at addr ffff88811ba5f598 by task hyperv_evmcs/2802 CPU: 12 UID: 1000 PID: 2802 Comm: hyperv_evmcs Not tainted 7.1.0-rc2 #7 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 Call Trace: <TASK> dump_stack_lvl+0x51/0x60 print_report+0xcb/0x5d0 kasan_report+0xb4/0xe0 kasan_check_range+0x35/0x1b0 hv_is_vp_in_sparse_set+0x85/0x100 [kvm] kvm_hv_flush_tlb+0xe9e/0x16c0 [kvm] kvm_hv_hypercall+0xe6b/0x1e60 [kvm] vmx_handle_exit+0x485/0x1b60 [kvm_intel] kvm_arch_vcpu_ioctl_run+0x22e3/0x5070 [kvm] kvm_vcpu_ioctl+0x5d0/0x10c0 [kvm] __x64_sys_ioctl+0x129/0x1a0 do_syscall_64+0xb9/0xcf0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f0e62d1a9bf </TASK> The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x11ba5f flags: 0x4000000000000000(zone=1) raw: 4000000000000000 0000000000000000 00000000ffffffff 0000000000000000 raw: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88811ba5f480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811ba5f500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88811ba5f580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811ba5f600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811ba5f680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Disabling lock debugging due to kernel taint Opportunistically add a compile time assertion to ensure the maximum number of sparse banks exactly matches the number of possible bits in the passed in mask. [sean: add KASAN splat, drop comment, add assert, massage changelog]

Severity

8.4 (High)


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

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/d18756b12aab30d07…
https://git.kernel.org/stable/c/83c2f52c6a78b1590…
https://git.kernel.org/stable/c/e36095d8d922bb26c…
https://git.kernel.org/stable/c/f636cf6a1e7b7f40d…
https://git.kernel.org/stable/c/4721f8160f17554b0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c58a318f6090efe06e6702b8882e2026f44f620e , < d18756b12aab30d07794446445c93112e5c69a2e (git) Affected: c58a318f6090efe06e6702b8882e2026f44f620e , < 83c2f52c6a78b1590034e955cff3fe0b052fe4ae (git) Affected: c58a318f6090efe06e6702b8882e2026f44f620e , < e36095d8d922bb26ce860231aacf0cd14edea07c (git) Affected: c58a318f6090efe06e6702b8882e2026f44f620e , < f636cf6a1e7b7f40d48d8d08bd5f152aa61dd130 (git) Affected: c58a318f6090efe06e6702b8882e2026f44f620e , < 4721f8160f17554b003e8928bb61e6c9b2fe92a3 (git)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (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)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/hyperv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d18756b12aab30d07794446445c93112e5c69a2e",
              "status": "affected",
              "version": "c58a318f6090efe06e6702b8882e2026f44f620e",
              "versionType": "git"
            },
            {
              "lessThan": "83c2f52c6a78b1590034e955cff3fe0b052fe4ae",
              "status": "affected",
              "version": "c58a318f6090efe06e6702b8882e2026f44f620e",
              "versionType": "git"
            },
            {
              "lessThan": "e36095d8d922bb26ce860231aacf0cd14edea07c",
              "status": "affected",
              "version": "c58a318f6090efe06e6702b8882e2026f44f620e",
              "versionType": "git"
            },
            {
              "lessThan": "f636cf6a1e7b7f40d48d8d08bd5f152aa61dd130",
              "status": "affected",
              "version": "c58a318f6090efe06e6702b8882e2026f44f620e",
              "versionType": "git"
            },
            {
              "lessThan": "4721f8160f17554b003e8928bb61e6c9b2fe92a3",
              "status": "affected",
              "version": "c58a318f6090efe06e6702b8882e2026f44f620e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/hyperv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.38",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: hyper-v: Bound the bank index when querying sparse banks\n\nWhen checking if a VP ID is included in a sparse bank set, explicitly check\nthat the ID can actually be contained in a sparse bank (the TLFS allows for\na maximum of 64 banks of 64 vCPUs each).  When handling a paravirtual TLB\nflush for L2, the VP ID is copied verbatim from the enlightened VMCS,\nwithout any bounds check, i.e. isn\u0027t guaranteed to be under the limit of\n4096.\n\nFailure to check the bounds of the VP ID leads to an out-of-bounds read\nwhen testing the sparse bank, and super strictly speaking could lead to KVM\nperforming an unnecessary TLB flush for an L2 vCPU.\n\n  ==================================================================\n  BUG: KASAN: use-after-free in hv_is_vp_in_sparse_set+0x85/0x100 [kvm]\n  Read of size 8 at addr ffff88811ba5f598 by task hyperv_evmcs/2802\n\n  CPU: 12 UID: 1000 PID: 2802 Comm: hyperv_evmcs Not tainted 7.1.0-rc2 #7 PREEMPT\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x51/0x60\n   print_report+0xcb/0x5d0\n   kasan_report+0xb4/0xe0\n   kasan_check_range+0x35/0x1b0\n   hv_is_vp_in_sparse_set+0x85/0x100 [kvm]\n   kvm_hv_flush_tlb+0xe9e/0x16c0 [kvm]\n   kvm_hv_hypercall+0xe6b/0x1e60 [kvm]\n   vmx_handle_exit+0x485/0x1b60 [kvm_intel]\n   kvm_arch_vcpu_ioctl_run+0x22e3/0x5070 [kvm]\n   kvm_vcpu_ioctl+0x5d0/0x10c0 [kvm]\n   __x64_sys_ioctl+0x129/0x1a0\n   do_syscall_64+0xb9/0xcf0\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n  RIP: 0033:0x7f0e62d1a9bf\n   \u003c/TASK\u003e\n\n  The buggy address belongs to the physical page:\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x11ba5f\n  flags: 0x4000000000000000(zone=1)\n  raw: 4000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n  raw: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000\n  page dumped because: kasan: bad access detected\n\n  Memory state around the buggy address:\n   ffff88811ba5f480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n   ffff88811ba5f500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n  \u003effff88811ba5f580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n                              ^\n   ffff88811ba5f600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n   ffff88811ba5f680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n  ==================================================================\n  Disabling lock debugging due to kernel taint\n\nOpportunistically add a compile time assertion to ensure the maximum number\nof sparse banks exactly matches the number of possible bits in the passed\nin mask.\n\n[sean: add KASAN splat, drop comment, add assert, massage changelog]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-27T04:59:07.831Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d18756b12aab30d07794446445c93112e5c69a2e"
        },
        {
          "url": "https://git.kernel.org/stable/c/83c2f52c6a78b1590034e955cff3fe0b052fe4ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/e36095d8d922bb26ce860231aacf0cd14edea07c"
        },
        {
          "url": "https://git.kernel.org/stable/c/f636cf6a1e7b7f40d48d8d08bd5f152aa61dd130"
        },
        {
          "url": "https://git.kernel.org/stable/c/4721f8160f17554b003e8928bb61e6c9b2fe92a3"
        }
      ],
      "title": "KVM: x86: hyper-v: Bound the bank index when querying sparse banks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64247",
    "datePublished": "2026-07-24T15:31:15.304Z",
    "dateReserved": "2026-07-19T15:36:31.772Z",
    "dateUpdated": "2026-07-27T04:59:07.831Z",
    "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.

Action not permitted

GHSA-2RQC-J7RG-XG47

CVE-2026-64247 (GCVE-0-2026-64247)

Tags

Sightings

Nomenclature