hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()

{
  "id": "e331b5777451c3ba5b0b70ac5ced938b46022d75b4383287a3702c07ad2ef33c",
  "url": "https://osv.dev/vulnerability/CVE-2026-98200",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show() nsensor->current_state is dynamically replaced as the sensor's state changes. update_numeric_sensor_from_wobj() does this by freeing the old string and installing a new one: if (strcmp(trimmed, nsensor->current_state)) { new_string = hp_wmi_strdup(dev, trimmed); if (new_string) { devm_kfree(dev, nsensor->current_state); nsensor->current_state = new_string; } } This function is only ever called from hp_wmi_update_info() while state->lock is held, so the free-and-replace itself is properly serialized against concurrent updates. fungible_show(), however, reads the same pointer after the lock has already been dropped: err = hp_wmi_update_info(state, info); if (err) return err; switch (prop) { ... case HP_WMI_PROPERTY_CURRENT_STATE: seq_printf(seqf, \"%s\\n\", nsensor->current_state); break; hp_wmi_update_info() takes state->lock internally and releases it before returning, so by the time fungible_show() dereferences nsensor->current_state in seq_printf(), no lock is held. Two processes reading a sensor's current_state debugfs entry at overlapping times (or one reading it while another read of the same sensor triggers a refresh) can race: one thread's seq_printf() can be part-way through printing the string at the moment another thread's call into update_numeric_sensor_from_wobj() frees it with devm_kfree() and installs a new pointer, causing a use-after-f",
    "evidence": "osv:CVE-2026-98200",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98200",
      "aliases": [
        "CVE-2026-98200"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "23902f98f8d4811ab84dde6419569a5b374f8122"
                },
                {
                  "fixed": "b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795"
                },
                {
                  "fixed": "f59ecfd2c58bace39538f3fff7f43788b3fdb539"
                },
                {
                  "fixed": "72c85149794a1ccf8d718ffed1521106b5d31968"
                },
                {
                  "fixed": "9c1e65bc79ff104914b11e6ad972139296ec86fe"
                },
                {
                  "fixed": "e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98200.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.5.0"
                },
                {
                  "fixed": "6.6.158"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.54"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98200.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.974365466Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/72c85149794a1ccf8d718ffed1521106b5d31968",
        "https://git.kernel.org/stable/c/9c1e65bc79ff104914b11e6ad972139296ec86fe",
        "https://git.kernel.org/stable/c/b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795",
        "https://git.kernel.org/stable/c/e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69",
        "https://git.kernel.org/stable/c/f59ecfd2c58bace39538f3fff7f43788b3fdb539",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98200.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98200",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98200.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98200",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 491645,
  "published_at": "2026-10-06T08:44:38.289+00:00"
}