CVE-2022-49612
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: power: supply: core: Fix boundary conditions in interpolation The functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple handle boundary conditions incorrectly. The change was introduced in a4585ba2050f460f749bbaf2b67bd56c41e30283 ("power: supply: core: Use library interpolation"). There are two issues: First, the lines "high = i - 1" and "high = i" in ocv2cap have the wrong order compared to temp2resist. As a consequence, ocv2cap sets high=-1 if ocv>table[0].ocv, which causes an out-of-bounds read. Second, the logic of temp2resist is also not correct. Consider the case table[] = {{20, 100}, {10, 80}, {0, 60}}. For temp=5, we expect a resistance of 70% by interpolation. However, temp2resist sets high=low=2 and returns 60.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-02-26 07:01:36.653000
Last modified
2026-11-05 20:17:07.647000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-02-26T07:01:36.653",
"lastModified": "2026-11-05T20:17:07.647",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: core: Fix boundary conditions in interpolation\n\nThe functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple\nhandle boundary conditions incorrectly.\nThe change was introduced in a4585ba2050f460f749bbaf2b67bd56c41e30283\n(\"power: supply: core: Use library interpolation\").\nThere are two issues: First, the lines \"high = i - 1\" and \"high = i\" in ocv2cap\nhave the wrong order compared to temp2resist. As a consequence, ocv2cap\nsets high=-1 if ocv>table[0].ocv, which causes an out-of-bounds read.\nSecond, the logic of temp2resist is also not correct.\nConsider the case table[] = {{20, 100}, {10, 80}, {0, 60}}.\nFor temp=5, we expect a resistance of 70% by interpolation.\nHowever, temp2resist sets high=low=2 and returns 60."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: power: supply: core: Fix boundary conditions in interpolation The functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple handle boundary conditions incorrectly. El cambio se introdujo en a4585ba2050f460f749bbaf2b67bd56c41e30283 (\"power: supply: core: Use library interpolation\"). Hay dos problemas: primero, las líneas \"high = i - 1\" y \"high = i\" en ocv2cap tienen el orden incorrecto en comparación con temp2resist. Como consecuencia, ocv2cap establece high=-1 si ocv>table[0].ocv, lo que provoca una lectura fuera de los límites. Segundo, la lógica de temp2resist tampoco es correcta. Considere el caso table[] = {{20, 100}, {10, 80}, {0, 60}}. Para temp=5, esperamos una resistencia del 70 % por interpolación. Sin embargo, temp2resist establece high=low=2 y devuelve 60."
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