CVE-2026-64070 (GCVE-0-2026-64070)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-11-06 16:34
VLAI
Title
powerpc/hv-gpci: fix preempt count leak in sysfs show paths
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/hv-gpci: fix preempt count leak in sysfs show paths Four sysfs show() callbacks in hv-gpci take get_cpu_var(hv_gpci_reqb) (which calls preempt_disable()) but only call the matching put_cpu_var() on the error path under the 'out:' label. Every successful read leaks one preempt_disable(): processor_bus_topology_show() processor_config_show() affinity_domain_via_virtual_processor_show() affinity_domain_via_domain_show() (affinity_domain_via_partition_show() was already correct.) On a CONFIG_PREEMPT=y kernel, repeated reads raise preempt_count and eventually return to userspace with preemption still disabled. The next user-mode page fault then hits faulthandler_disabled() == 1, gets forced to SIGSEGV, and the resulting coredump trips 'BUG: scheduling while atomic' in call_usermodehelper_exec -> wait_for_completion_state -> schedule: BUG: scheduling while atomic: <task>/<pid>/0x00000004 ... __schedule_bug+0x6c/0x90 __schedule+0x58c/0x13a0 schedule+0x48/0x1a0 schedule_timeout+0x104/0x170 wait_for_completion_state+0x16c/0x330 call_usermodehelper_exec+0x254/0x2d0 vfs_coredump+0x1050/0x2590 get_signal+0xb9c/0xc80 do_notify_resume+0xf8/0x470 Add an out_success label that calls put_cpu_var() before returning the byte count, mirroring affinity_domain_via_partition_show().
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:29 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 , < b300312562fd6e4729697adb9f777f00ca0429f3 (git)
Affected: 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 , < 45afabe7f99c5d8746434ee41c86584c01d70147 (git)
Affected: 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 , < b61ebb2826ca1852c2bbd92a676fb622c358cab4 (git)
Affected: 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 , < 903409000a07ac8e31ffedeb8516f4f8d67150c8 (git)
Affected: 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 , < dbc30a57bd8e026995e9fa8e8c31cffd18542c01 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "44",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: powerpc/hv-gpci: fix preempt count leak in sysfs show paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64070.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-14T02:57:45Z",
      "cve": "CVE-2026-64070",
      "id": "CVE-2026-64070",
      "initial_release_date": "2026-07-21T13:00:15Z",
      "product_status:known_affected": "488",
      "product_status:known_not_affected": "251",
      "product_status:recommended": "340",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64070",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-64070.json",
      "version": "12"
    },
    "vulnrichment": {
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              {
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                  "content": {
                    "id": "CVE-2026-64070",
                    "options": [
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                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-11-06T16:29:37.174523Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-11-06T16:29:38.847Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "arch/powerpc/perf/hv-gpci.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
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                  "status": "affected",
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                {
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                  "versionType": "git"
                },
                {
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                  "versionType": "git"
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              ]
            },
            {
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              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.6"
                },
                {
                  "lessThan": "6.6",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.156",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.108",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.49",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.0.*",
                  "status": "unaffected",
                  "version": "7.0.11",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.1",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
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                  "cpeMatch": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.156",
                      "versionStartIncluding": "6.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.108",
                      "versionStartIncluding": "6.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.49",
                      "versionStartIncluding": "6.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0.11",
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                      "vulnerable": true
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                    {
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                      "vulnerable": true
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                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/hv-gpci: fix preempt count leak in sysfs show paths\n\nFour sysfs show() callbacks in hv-gpci take get_cpu_var(hv_gpci_reqb)\n(which calls preempt_disable()) but only call the matching put_cpu_var()\non the error path under the \u0027out:\u0027 label. Every successful read leaks\none preempt_disable():\n\n  processor_bus_topology_show()\n  processor_config_show()\n  affinity_domain_via_virtual_processor_show()\n  affinity_domain_via_domain_show()\n\n(affinity_domain_via_partition_show() was already correct.)\n\nOn a CONFIG_PREEMPT=y kernel, repeated reads raise preempt_count and\neventually return to userspace with preemption still disabled. The\nnext user-mode page fault then hits faulthandler_disabled() == 1,\ngets forced to SIGSEGV, and the resulting coredump trips\n\u0027BUG: scheduling while atomic\u0027 in call_usermodehelper_exec -\u003e\nwait_for_completion_state -\u003e schedule:\n\n  BUG: scheduling while atomic: \u003ctask\u003e/\u003cpid\u003e/0x00000004\n  ...\n  __schedule_bug+0x6c/0x90\n  __schedule+0x58c/0x13a0\n  schedule+0x48/0x1a0\n  schedule_timeout+0x104/0x170\n  wait_for_completion_state+0x16c/0x330\n  call_usermodehelper_exec+0x254/0x2d0\n  vfs_coredump+0x1050/0x2590\n  get_signal+0xb9c/0xc80\n  do_notify_resume+0xf8/0x470\n\nAdd an out_success label that calls put_cpu_var() before returning\nthe byte count, mirroring affinity_domain_via_partition_show()."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-02T12:49:39.984Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
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              "url": "https://git.kernel.org/stable/c/b300312562fd6e4729697adb9f777f00ca0429f3"
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            },
            {
              "url": "https://git.kernel.org/stable/c/dbc30a57bd8e026995e9fa8e8c31cffd18542c01"
            }
          ],
          "title": "powerpc/hv-gpci: fix preempt count leak in sysfs show paths",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
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      },
      "cveMetadata": {
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64070",
        "datePublished": "2026-07-19T15:39:46.536Z",
        "dateReserved": "2026-07-19T07:54:57.030Z",
        "dateUpdated": "2026-11-06T16:34:25.359Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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