CVE-2026-64565
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data() The `ims_pcu_process_data()` processes incoming URB data byte by byte. However, it fails to check if the `read_pos` index exceeds IMS_PCU_BUF_SIZE. If a malicious USB device sends a packet larger than IMS_PCU_BUF_SIZE, `read_pos` will increment indefinitely. Moreover, since `read_pos` is located immediately after `read_buf`, the attacker can overwrite `read_pos` itself to arbitrarily control the index. This manipulated `read_pos` is subsequently used in `ims_pcu_handle_response()` to copy data into `cmd_buf`, leading to a heap buffer overflow. Specifically, an attacker can overwrite the `cmd_done.wait.head` located at offset 136 relative to `cmd_buf` in the `ims_pcu_handle_response()`. Consequently, when the driver calls `complete(&pcu->cmd_done)`, it triggers a control flow hijack by using the manipulated pointer. Fix this by adding a bounds check for `read_pos` before writing to `read_buf`. If the packet is too long, discard it, log a warning, and reset the parser state. [dtor: factor out resetting packet state, reset checksum as well]
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-04 07:16:31.477000
Last modified
2026-10-23 23:10:00.157000
View original CVE JSON
{
"id": "CVE-2026-64565",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-08-04T07:16:31.477",
"lastModified": "2026-10-23T23:10:00.157",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()\n\nThe `ims_pcu_process_data()` processes incoming URB data byte by byte.\nHowever, it fails to check if the `read_pos` index exceeds\nIMS_PCU_BUF_SIZE.\n\nIf a malicious USB device sends a packet larger than IMS_PCU_BUF_SIZE,\n`read_pos` will increment indefinitely. Moreover, since `read_pos` is\nlocated immediately after `read_buf`, the attacker can overwrite\n`read_pos` itself to arbitrarily control the index.\n\nThis manipulated `read_pos` is subsequently used in\n`ims_pcu_handle_response()` to copy data into `cmd_buf`, leading to a\nheap buffer overflow.\n\nSpecifically, an attacker can overwrite the `cmd_done.wait.head` located\nat offset 136 relative to `cmd_buf` in the `ims_pcu_handle_response()`.\nConsequently, when the driver calls `complete(&pcu->cmd_done)`, it\ntriggers a control flow hijack by using the manipulated pointer.\n\nFix this by adding a bounds check for `read_pos` before writing to\n`read_buf`. If the packet is too long, discard it, log a warning,\nand reset the parser state.\n\n[dtor: factor out resetting packet state, reset checksum as well]"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nEntrada: ims-pcu - soluciona desbordamiento de búfer de pila en ims_pcu_process_data()\n\nLa ’ims_pcu_process_data()’ procesa los datos URB entrantes byte a byte.\nSin embargo, no verifica si el índice ’read_pos’ excede ’IMS_PCU_BUF_SIZE’.\n\nSi un dispositivo USB malicioso envía un paquete más grande que ’IMS_PCU_BUF_SIZE’, ’read_pos’ se incrementará indefinidamente. Además, dado que ’read_pos’ se encuentra inmediatamente después de ’read_buf’, el atacante puede sobrescribir el propio ’read_pos’ para controlar arbitrariamente el índice.\n\nEste ’read_pos’ manipulado se utiliza posteriormente en ’ims_pcu_handle_response()’ para copiar datos en ’cmd_buf’, lo que lleva a un desbordamiento de búfer de pila.\n\nEspecíficamente, un atacante puede sobrescribir el ’cmd_done.wait.head’ ubicado en el desplazamiento 136 con respecto a ’cmd_buf’ en ’ims_pcu_handle_response()’. En consecuencia, cuando el controlador llama a ’complete(&pcu -> cmd_done)’, desencadena un secuestro de flujo de control mediante el uso del puntero manipulado.\n\nSolucione esto añadiendo una comprobación de límites para ’read_pos’ antes de escribir en ’read_buf’. Si el paquete es demasiado largo, deséchelo, registre una advertencia y reinicie el estado del analizador.\n\n[dtor: refactorizar el restablecimiento del estado del paquete, restablecer la suma de verificación también]"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/input/misc/ims-pcu.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "628329d52474323938a03826941e166bc7c8eff4",
"lessThan": "06cfff93fd40441292567b999091beab11c74504",
"versionType": "git",
"status": "affected"
},
{
"version": "628329d52474323938a03826941e166bc7c8eff4",
"lessThan": "992a7173364dcf63e30012af43da3c2f279839f9",
"versionType": "git",
"status": "affected"
},
{
"version": "628329d52474323938a03826941e166bc7c8eff4",
"lessThan": "3a801bc75ba1d121d0ed60e7234f93ba5651d87d",
"versionType": "git",
"status": "affected"
},
{
"version": "628329d52474323938a03826941e166bc7c8eff4",
"lessThan": "40bbbf2e91fd60715525bf0405c67876af817edf",
"versionType": "git",
"status": "affected"
},
{
"version": "628329d52474323938a03826941e166bc7c8eff4",
"lessThan": "ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49",
"versionType": "git",
"status": "affected"
},
{
"version": "628329d52474323938a03826941e166bc7c8eff4",
"lessThan": "d03a740e087de7dcb2a26dc1123377bd3d1d84ca",
"versionType": "git",
"status": "affected"
},
{
"version": "628329d52474323938a03826941e166bc7c8eff4",
"lessThan": "875115b82c295277b81b6dfee7debc725f44e854",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/input/misc/ims-pcu.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "3.10",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.10",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.265",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.216",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.183",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.148",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.101",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.42",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.1",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/06cfff93fd40441292567b999091beab11c74504",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3a801bc75ba1d121d0ed60e7234f93ba5651d87d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/40bbbf2e91fd60715525bf0405c67876af817edf",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/875115b82c295277b81b6dfee7debc725f44e854",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/992a7173364dcf63e30012af43da3c2f279839f9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d03a740e087de7dcb2a26dc1123377bd3d1d84ca",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}