CVE-2022-49612 (GCVE-0-2022-49612)
Vulnerability from cvelistv5
Published
2025-02-26 02:23
Modified
2025-05-04 08:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
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"nvd": "{\"cve\":{\"id\":\"CVE-2022-49612\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:36.653\",\"lastModified\":\"2025-02-26T07:01:36.653\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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\u003etable[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 l\u00edneas \\\"high = i - 1\\\" y \\\"high = i\\\" en ocv2cap tienen el orden incorrecto en comparaci\u00f3n con temp2resist. Como consecuencia, ocv2cap establece high=-1 si ocv\u0026gt;table[0].ocv, lo que provoca una lectura fuera de los l\u00edmites. Segundo, la l\u00f3gica de temp2resist tampoco es correcta. Considere el caso table[] = {{20, 100}, {10, 80}, {0, 60}}. Para temp=5, esperamos una resistencia del 70 % por interpolaci\u00f3n. Sin embargo, temp2resist establece high=low=2 y devuelve 60.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/093d27bb6f2d1963f927ef59c9a2d37059175426\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a762cee5d933fe4e2e1b773d60fc74fb8248d8c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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