CVE-2026-98200 (GCVE-0-2026-98200)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:44 – Updated: 2026-10-06 08:44
VLAI
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-free read. Take state->lock around the read in fungible_show() as well, so it can never run concurrently with the free-and-replace in update_numeric_sensor_from_wobj().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 23902f98f8d4811ab84dde6419569a5b374f8122 , < b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795 (git)
Affected: 23902f98f8d4811ab84dde6419569a5b374f8122 , < f59ecfd2c58bace39538f3fff7f43788b3fdb539 (git)
Affected: 23902f98f8d4811ab84dde6419569a5b374f8122 , < 72c85149794a1ccf8d718ffed1521106b5d31968 (git)
Affected: 23902f98f8d4811ab84dde6419569a5b374f8122 , < 9c1e65bc79ff104914b11e6ad972139296ec86fe (git)
Affected: 23902f98f8d4811ab84dde6419569a5b374f8122 , < e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69 (git)
Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()\n\nnsensor-\u003ecurrent_state is dynamically replaced as the sensor\u0027s state\nchanges. update_numeric_sensor_from_wobj() does this by freeing the\nold string and installing a new one:\n\n\tif (strcmp(trimmed, nsensor-\u003ecurrent_state)) {\n\t\tnew_string = hp_wmi_strdup(dev, trimmed);\n\t\tif (new_string) {\n\t\t\tdevm_kfree(dev, nsensor-\u003ecurrent_state);\n\t\t\tnsensor-\u003ecurrent_state = new_string;\n\t\t}\n\t}\n\nThis function is only ever called from hp_wmi_update_info() while\nstate-\u003elock is held, so the free-and-replace itself is properly\nserialized against concurrent updates.\n\nfungible_show(), however, reads the same pointer after the lock has\nalready been dropped:\n\n\terr = hp_wmi_update_info(state, info);\n\tif (err)\n\t\treturn err;\n\n\tswitch (prop) {\n\t...\n\tcase HP_WMI_PROPERTY_CURRENT_STATE:\n\t\tseq_printf(seqf, \"%s\\n\", nsensor-\u003ecurrent_state);\n\t\tbreak;\n\nhp_wmi_update_info() takes state-\u003elock internally and releases it\nbefore returning, so by the time fungible_show() dereferences\nnsensor-\u003ecurrent_state in seq_printf(), no lock is held. Two\nprocesses reading a sensor\u0027s current_state debugfs entry at\noverlapping times (or one reading it while another read of the same\nsensor triggers a refresh) can race: one thread\u0027s seq_printf() can\nbe part-way through printing the string at the moment another\nthread\u0027s call into update_numeric_sensor_from_wobj() frees it with\ndevm_kfree() and installs a new pointer, causing a use-after-free\nread.\n\nTake state-\u003elock around the read in fungible_show() as well, so it\ncan never run concurrently with the free-and-replace in\nupdate_numeric_sensor_from_wobj()."
        }
      ],
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        "dateUpdated": "2026-10-06T08:44:38.289Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-10-06T08:44:38.289Z",
    "dateReserved": "2026-09-25T10:25:14.324Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()\n\nnsensor-\u003ecurrent_state is dynamically replaced as the sensor\u0027s state\nchanges. update_numeric_sensor_from_wobj() does this by freeing the\nold string and installing a new one:\n\n\tif (strcmp(trimmed, nsensor-\u003ecurrent_state)) {\n\t\tnew_string = hp_wmi_strdup(dev, trimmed);\n\t\tif (new_string) {\n\t\t\tdevm_kfree(dev, nsensor-\u003ecurrent_state);\n\t\t\tnsensor-\u003ecurrent_state = new_string;\n\t\t}\n\t}\n\nThis function is only ever called from hp_wmi_update_info() while\nstate-\u003elock is held, so the free-and-replace itself is properly\nserialized against concurrent updates.\n\nfungible_show(), however, reads the same pointer after the lock has\nalready been dropped:\n\n\terr = hp_wmi_update_info(state, info);\n\tif (err)\n\t\treturn err;\n\n\tswitch (prop) {\n\t...\n\tcase HP_WMI_PROPERTY_CURRENT_STATE:\n\t\tseq_printf(seqf, \"%s\\n\", nsensor-\u003ecurrent_state);\n\t\tbreak;\n\nhp_wmi_update_info() takes state-\u003elock internally and releases it\nbefore returning, so by the time fungible_show() dereferences\nnsensor-\u003ecurrent_state in seq_printf(), no lock is held. Two\nprocesses reading a sensor\u0027s current_state debugfs entry at\noverlapping times (or one reading it while another read of the same\nsensor triggers a refresh) can race: one thread\u0027s seq_printf() can\nbe part-way through printing the string at the moment another\nthread\u0027s call into update_numeric_sensor_from_wobj() frees it with\ndevm_kfree() and installs a new pointer, causing a use-after-free\nread.\n\nTake state-\u003elock around the read in fungible_show() as well, so it\ncan never run concurrently with the free-and-replace in\nupdate_numeric_sensor_from_wobj()."
          }
        ],
        "id": "CVE-2026-98200",
        "lastModified": "2026-10-06T09:18:05.747",
        "metrics": {},
        "published": "2026-10-06T09:18:05.747",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "current_release_date": "2026-10-08T23:35:29+00:00",
      "cve": "CVE-2026-98200",
      "id": "CVE-2026-98200",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98200.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-08T16:50:47Z",
      "cve": "CVE-2026-98200",
      "id": "CVE-2026-98200",
      "initial_release_date": "2026-10-08T16:50:47Z",
      "product_status:known_not_affected": "347",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98200",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98200.json",
      "version": "2"
    }
  }
}



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