CVE-2021-47202 (GCVE-0-2021-47202)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2026-05-11 13:49
VLAI
Title
thermal: Fix NULL pointer dereferences in of_thermal_ functions
Summary
In the Linux kernel, the following vulnerability has been resolved: thermal: Fix NULL pointer dereferences in of_thermal_ functions of_parse_thermal_zones() parses the thermal-zones node and registers a thermal_zone device for each subnode. However, if a thermal zone is consuming a thermal sensor and that thermal sensor device hasn't probed yet, an attempt to set trip_point_*_temp for that thermal zone device can cause a NULL pointer dereference. Fix it. console:/sys/class/thermal/thermal_zone87 # echo 120000 > trip_point_0_temp ... Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 ... Call trace: of_thermal_set_trip_temp+0x40/0xc4 trip_point_temp_store+0xc0/0x1dc dev_attr_store+0x38/0x88 sysfs_kf_write+0x64/0xc0 kernfs_fop_write_iter+0x108/0x1d0 vfs_write+0x2f4/0x368 ksys_write+0x7c/0xec __arm64_sys_write+0x20/0x30 el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc do_el0_svc+0x28/0xa0 el0_svc+0x14/0x24 el0_sync_handler+0x88/0xec el0_sync+0x1c0/0x200 While at it, fix the possible NULL pointer dereference in other functions as well: of_thermal_get_temp(), of_thermal_set_emul_temp(), of_thermal_get_trend().
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2251aef64a38db60f4ae7a4a83f9203c6791f196 , < 828f4c31684da94ecf0b44a2cbd35bbede04f0bd (git)
Affected: 2251aef64a38db60f4ae7a4a83f9203c6791f196 , < 6a315471cb6a07f651e1d3adc8962730f4fcccac (git)
Affected: 2251aef64a38db60f4ae7a4a83f9203c6791f196 , < 0750f769b95841b34a9fe8c418dd792ff526bf86 (git)
Affected: 2251aef64a38db60f4ae7a4a83f9203c6791f196 , < ef2590a5305e0b8e9342f84c2214aa478ee7f28e (git)
Affected: 2251aef64a38db60f4ae7a4a83f9203c6791f196 , < 96cfe05051fd8543cdedd6807ec59a0e6c409195 (git)
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Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.4.210 , ≤ 5.4.* (semver)
Unaffected: 5.10.81 , ≤ 5.10.* (semver)
Unaffected: 5.14.21 , ≤ 5.14.* (semver)
Unaffected: 5.15.4 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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Fix it.\\n\\n console:/sys/class/thermal/thermal_zone87 # echo 120000 \u003e trip_point_0_temp\\n ...\\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020\\n ...\\n Call trace:\\n  of_thermal_set_trip_temp+0x40/0xc4\\n  trip_point_temp_store+0xc0/0x1dc\\n  dev_attr_store+0x38/0x88\\n  sysfs_kf_write+0x64/0xc0\\n  kernfs_fop_write_iter+0x108/0x1d0\\n  vfs_write+0x2f4/0x368\\n  ksys_write+0x7c/0xec\\n  __arm64_sys_write+0x20/0x30\\n  el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc\\n  do_el0_svc+0x28/0xa0\\n  el0_svc+0x14/0x24\\n  el0_sync_handler+0x88/0xec\\n  el0_sync+0x1c0/0x200\\n\\nWhile at it, fix the possible NULL pointer dereference in other\\nfunctions as well: of_thermal_get_temp(), of_thermal_set_emul_temp(),\\nof_thermal_get_trend().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: thermal: Fix NULL pointer dereferences in of_thermal_ functions of_parse_thermal_zones() analiza el nodo thermal-zones y registra un dispositivo thermal_zone para cada subnodo. Sin embargo, si una zona t\u00e9rmica est\u00e1 consumiendo un sensor t\u00e9rmico y ese dispositivo de sensor t\u00e9rmico a\u00fan no ha realizado la prueba, un intento de establecer trip_point_*_temp para ese dispositivo de zona t\u00e9rmica puede provocar una desreferencia de puntero NULL. Arr\u00e9glelo. console:/sys/class/thermal/thermal_zone87 # echo 120000 \u0026gt; trip_point_0_temp ... No se puede manejar la desreferencia del puntero NULL del n\u00facleo en la direcci\u00f3n virtual 0000000000000020 ... Seguimiento de llamadas: of_thermal_set_trip_temp+0x40/0xc4 trip_point_temp_store+0xc0/0x1dc dev_attr_store+0x38/0x88 sysfs_kf_write+0x64/0xc0 kernfs_fop_write_iter+0x108/0x1d0 vfs_write+0x2f4/0x368 ksys_write+0x7c/0xec __arm64_sys_write+0x20/0x30 el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc do_el0_svc+0x28/0xa0 el0_svc+0x14/0x24 el0_sync_handler+0x88/0xec el0_sync+0x1c0/0x200 Mientras tanto, corrija tambi\u00e9n la posible desreferencia del puntero NULL en otras funciones: of_thermal_get_temp(), of_thermal_set_emul_temp(), 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However, if a thermal zone is\\nconsuming a thermal sensor and that thermal sensor device hasn\u0027t probed\\nyet, an attempt to set trip_point_*_temp for that thermal zone device\\ncan cause a NULL pointer dereference. 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      "dataType": "CVE_RECORD",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.