CVE-2026-98200
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:
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:
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.
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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().
Detalles técnicos trazas, registros y código del informe original
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;
}
}
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;CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- 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
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98200",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "23902f98f8d4811ab84dde6419569a5b374f8122",
"lessThan": "b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795",
"versionType": "git"
},
{
"status": "affected",
"version": "23902f98f8d4811ab84dde6419569a5b374f8122",
"lessThan": "f59ecfd2c58bace39538f3fff7f43788b3fdb539",
"versionType": "git"
},
{
"status": "affected",
"version": "23902f98f8d4811ab84dde6419569a5b374f8122",
"lessThan": "72c85149794a1ccf8d718ffed1521106b5d31968",
"versionType": "git"
},
{
"status": "affected",
"version": "23902f98f8d4811ab84dde6419569a5b374f8122",
"lessThan": "9c1e65bc79ff104914b11e6ad972139296ec86fe",
"versionType": "git"
},
{
"status": "affected",
"version": "23902f98f8d4811ab84dde6419569a5b374f8122",
"lessThan": "e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69",
"versionType": "git"
}
],
"programFiles": [
"drivers/hwmon/hp-wmi-sensors.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc4",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/hwmon/hp-wmi-sensors.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-06T09:18:05.747",
"references": [
{
"url": "https://git.kernel.org/stable/c/72c85149794a1ccf8d718ffed1521106b5d31968",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9c1e65bc79ff104914b11e6ad972139296ec86fe",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f59ecfd2c58bace39538f3fff7f43788b3fdb539",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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->current_state is dynamically replaced as the sensor's 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->current_state)) {\n\t\tnew_string = hp_wmi_strdup(dev, trimmed);\n\t\tif (new_string) {\n\t\t\tdevm_kfree(dev, nsensor->current_state);\n\t\t\tnsensor->current_state = new_string;\n\t\t}\n\t}\n\nThis function is only ever called from hp_wmi_update_info() while\nstate->lock 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->current_state);\n\t\tbreak;\n\nhp_wmi_update_info() takes state->lock internally and releases it\nbefore returning, so by the time fungible_show() dereferences\nnsensor->current_state in seq_printf(), no lock is held. Two\nprocesses reading a sensor's 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's seq_printf() can\nbe part-way through printing the string at the moment another\nthread's 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->lock 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()."
}
],
"lastModified": "2026-10-06T09:18:05.747",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}