cve-2024-35985
Vulnerability from cvelistv5
Published
2024-05-20 09:47
Modified
2024-09-11 17:32
Severity
Summary
sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website


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                "id": "CVE-2024-35985",
                "options": [
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                    "Exploitation": "none"
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    "cna": {
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()\n\nIt was possible to have pick_eevdf() return NULL, which then causes a\nNULL-deref. This turned out to be due to entity_eligible() returning\nfalsely negative because of a s64 multiplcation overflow.\n\nSpecifically, reweight_eevdf() computes the vlag without considering\nthe limit placed upon vlag as update_entity_lag() does, and then the\nscaling multiplication (remember that weight is 20bit fixed point) can\noverflow. This then leads to the new vruntime being weird which then\ncauses the above entity_eligible() to go side-ways and claim nothing\nis eligible.\n\nThus limit the range of vlag accordingly.\n\nAll this was quite rare, but fatal when it does happen."
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          "url": "https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe"
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      "title": "sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-35985",
    "datePublished": "2024-05-20T09:47:52.389Z",
    "dateReserved": "2024-05-17T13:50:33.145Z",
    "dateUpdated": "2024-09-11T17:32:48.299Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-35985\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-20T10:15:12.920\",\"lastModified\":\"2024-05-20T13:00:04.957\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()\\n\\nIt was possible to have pick_eevdf() return NULL, which then causes a\\nNULL-deref. This turned out to be due to entity_eligible() returning\\nfalsely negative because of a s64 multiplcation overflow.\\n\\nSpecifically, reweight_eevdf() computes the vlag without considering\\nthe limit placed upon vlag as update_entity_lag() does, and then the\\nscaling multiplication (remember that weight is 20bit fixed point) can\\noverflow. This then leads to the new vruntime being weird which then\\ncauses the above entity_eligible() to go side-ways and claim nothing\\nis eligible.\\n\\nThus limit the range of vlag accordingly.\\n\\nAll this was quite rare, but fatal when it does happen.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: sched/eevdf: evita que vlag se salga de los l\u00edmites en reweight_eevdf(). Era posible que pick_eevdf() devolviera NULL, lo que luego causa un NULL-deref. Esto result\u00f3 ser debido a que entidad_eligible() devolvi\u00f3 un resultado falso negativo debido a un desbordamiento de multiplicaci\u00f3n s64. Espec\u00edficamente, reweight_eevdf() calcula el vlag sin considerar el l\u00edmite impuesto a vlag como lo hace update_entity_lag(), y luego la multiplicaci\u00f3n de escala (recuerde que el peso es un punto fijo de 20 bits) puede desbordarse. Esto luego lleva a que el nuevo vruntime sea extra\u00f1o, lo que luego hace que la entidad_eligible() anterior se desv\u00ede y afirme que nada es elegible. Por lo tanto, limite el rango de vlag en consecuencia. Todo esto fue bastante raro, pero fatal cuando sucede.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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