CVE-2025-39936
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Always pass in an error pointer to __sev_platform_shutdown_locked() When 9770b428b1a2 ("crypto: ccp - Move dev_info/err messages for SEV/SNP init and shutdown") moved the error messages dumping so that they don't need to be issued by the callers, it missed the case where __sev_firmware_shutdown() calls __sev_platform_shutdown_locked() with a NULL argument which leads to a NULL ptr deref on the shutdown path, during suspend to disk: #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 0 UID: 0 PID: 983 Comm: hib.sh Not tainted 6.17.0-rc4+ #1 PREEMPT(voluntary) Hardware name: Supermicro Super Server/H12SSL-i, BIOS 2.5 09/08/2022 RIP: 0010:__sev_platform_shutdown_locked.cold+0x0/0x21 [ccp] That rIP is: 00000000000006fd <__sev_platform_shutdown_locked.cold>: 6fd: 8b 13 mov (%rbx),%edx 6ff: 48 8b 7d 00 mov 0x0(%rbp),%rdi 703: 89 c1 mov %eax,%ecx Code: 74 05 31 ff 41 89 3f 49 8b 3e 89 ea 48 c7 c6 a0 8e 54 a0 41 bf 92 ff ff ff e8 e5 2e 09 e1 c6 05 2a d4 38 00 01 e9 26 af ff ff <8b> 13 48 8b 7d 00 89 c1 48 c7 c6 18 90 54 a0 89 44 24 04 e8 c1 2e RSP: 0018:ffffc90005467d00 EFLAGS: 00010282 RAX: 00000000ffffff92 RBX: 0000000000000000 RCX: 0000000000000000 ^^^^^^^^^^^^^^^^ and %rbx is nice and clean. Call Trace: <TASK> __sev_firmware_shutdown.isra.0 sev_dev_destroy psp_dev_destroy sp_destroy pci_device_shutdown device_shutdown kernel_power_off hibernate.cold state_store kernfs_fop_write_iter vfs_write ksys_write do_syscall_64 entry_SYSCALL_64_after_hwframe Pass in a pointer to the function-local error var in the caller. With that addressed, suspending the ccp shows the error properly at least: ccp 0000:47:00.1: sev command 0x2 timed out, disabling PSP ccp 0000:47:00.1: SEV: failed to SHUTDOWN error 0x0, rc -110 SEV-SNP: Leaking PFN range 0x146800-0x146a00 SEV-SNP: PFN 0x146800 unassigned, dumping non-zero entries in 2M PFN region: [0x146800 - 0x146a00] ... ccp 0000:47:00.1: SEV-SNP firmware shutdown failed, rc -16, error 0x0 ACPI: PM: Preparing to enter system sleep state S5 kvm: exiting hardware virtualization reboot: Power down Btw, this driver is crying to be cleaned up to pass in a proper I/O struct which can be used to store information between the different functions, otherwise stuff like that will happen in the future again.
View original CVE JSON
{
"id": "CVE-2025-39936",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-10-04T08:15:46.460",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Always pass in an error pointer to __sev_platform_shutdown_locked()\n\nWhen\n\n 9770b428b1a2 (\"crypto: ccp - Move dev_info/err messages for SEV/SNP init and shutdown\")\n\nmoved the error messages dumping so that they don't need to be issued by\nthe callers, it missed the case where __sev_firmware_shutdown() calls\n__sev_platform_shutdown_locked() with a NULL argument which leads to\na NULL ptr deref on the shutdown path, during suspend to disk:\n\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP NOPTI\n CPU: 0 UID: 0 PID: 983 Comm: hib.sh Not tainted 6.17.0-rc4+ #1 PREEMPT(voluntary)\n Hardware name: Supermicro Super Server/H12SSL-i, BIOS 2.5 09/08/2022\n RIP: 0010:__sev_platform_shutdown_locked.cold+0x0/0x21 [ccp]\n\nThat rIP is:\n\n 00000000000006fd <__sev_platform_shutdown_locked.cold>:\n 6fd: 8b 13 mov (%rbx),%edx\n 6ff: 48 8b 7d 00 mov 0x0(%rbp),%rdi\n 703: 89 c1 mov %eax,%ecx\n\n Code: 74 05 31 ff 41 89 3f 49 8b 3e 89 ea 48 c7 c6 a0 8e 54 a0 41 bf 92 ff ff ff e8 e5 2e 09 e1 c6 05 2a d4 38 00 01 e9 26 af ff ff <8b> 13 48 8b 7d 00 89 c1 48 c7 c6 18 90 54 a0 89 44 24 04 e8 c1 2e\n RSP: 0018:ffffc90005467d00 EFLAGS: 00010282\n RAX: 00000000ffffff92 RBX: 0000000000000000 RCX: 0000000000000000\n \t\t\t ^^^^^^^^^^^^^^^^\nand %rbx is nice and clean.\n\n Call Trace:\n <TASK>\n __sev_firmware_shutdown.isra.0\n sev_dev_destroy\n psp_dev_destroy\n sp_destroy\n pci_device_shutdown\n device_shutdown\n kernel_power_off\n hibernate.cold\n state_store\n kernfs_fop_write_iter\n vfs_write\n ksys_write\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n\nPass in a pointer to the function-local error var in the caller.\n\nWith that addressed, suspending the ccp shows the error properly at\nleast:\n\n ccp 0000:47:00.1: sev command 0x2 timed out, disabling PSP\n ccp 0000:47:00.1: SEV: failed to SHUTDOWN error 0x0, rc -110\n SEV-SNP: Leaking PFN range 0x146800-0x146a00\n SEV-SNP: PFN 0x146800 unassigned, dumping non-zero entries in 2M PFN region: [0x146800 - 0x146a00]\n ...\n ccp 0000:47:00.1: SEV-SNP firmware shutdown failed, rc -16, error 0x0\n ACPI: PM: Preparing to enter system sleep state S5\n kvm: exiting hardware virtualization\n reboot: Power down\n\nBtw, this driver is crying to be cleaned up to pass in a proper I/O\nstruct which can be used to store information between the different\nfunctions, otherwise stuff like that will happen in the future again."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: ccp - Siempre pase un puntero de error a __sev_platform_shutdown_locked()\n\nCuando\n\n 9770b428b1a2 ('crypto: ccp - Mover mensajes dev_info/err para la inicialización y apagado de SEV/SNP')\n\nmovió el volcado de mensajes de error para que no necesiten ser emitidos por los llamadores, se pasó por alto el caso donde __sev_firmware_shutdown() llama a __sev_platform_shutdown_locked() con un argumento NULL, lo que lleva a una desreferencia de puntero NULL en la ruta de apagado, durante la suspensión a disco:\n\n #PF: acceso de lectura de supervisor en modo kernel\n #PF: error_code(0x0000) - página no presente\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP NOPTI\n CPU: 0 UID: 0 PID: 983 Comm: hib.sh No contaminado 6.17.0-rc4+ #1 PREEMPT(voluntario)\n Nombre de hardware: Supermicro Super Server/H12SSL-i, BIOS 2.5 09/08/2022\n RIP: 0010:__sev_platform_shutdown_locked.cold+0x0/0x21 [ccp]\n\nEse rIP es:\n\n 00000000000006fd <__sev_platform_shutdown_locked.cold>:\n 6fd: 8b 13 mov (%rbx),%edx\n 6ff: 48 8b 7d 00 mov 0x0(%rbp),%rdi\n 703: 89 c1 mov %eax,%ecx\n\n Code: 74 05 31 ff 41 89 3f 49 8b 3e 89 ea 48 c7 c6 a0 8e 54 a0 41 bf 92 ff ff ff e8 e5 2e 09 e1 c6 05 2a d4 38 00 01 e9 26 af ff ff <8b> 13 48 8b 7d 00 89 c1 48 c7 c6 18 90 54 a0 89 44 24 04 e8 c1 2e\n RSP: 0018:ffffc90005467d00 EFLAGS: 00010282\n RAX: 00000000ffffff92 RBX: 0000000000000000 RCX: 0000000000000000\n \t\t\t ^^^^^^^^^^^^^^^^\ny %rbx está limpio y ordenado.\n\n Traza de Llamada:\n <TAREA>\n __sev_firmware_shutdown.isra.0\n sev_dev_destroy\n psp_dev_destroy\n sp_destroy\n pci_device_shutdown\n device_shutdown\n kernel_power_off\n hibernate.cold\n state_store\n kernfs_fop_write_iter\n vfs_write\n ksys_write\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n\nPase un puntero a la variable de error local de la función en el llamador.\n\nCon eso resuelto, suspender el ccp muestra el error correctamente al menos:\n\n ccp 0000:47:00.1: el comando sev 0x2 agotó el tiempo de espera, deshabilitando PSP\n ccp 0000:47:00.1: SEV: falló al APAGAR error 0x0, rc -110\n SEV-SNP: Fuga de rango PFN 0x146800-0x146a00\n SEV-SNP: PFN 0x146800 sin asignar, volcando entradas no cero en la región PFN de 2M: [0x146800 - 0x146a00]\n ...\n ccp 0000:47:00.1: el apagado del firmware SEV-SNP falló, rc -16, error 0x0\n ACPI: PM: Preparándose para entrar en el estado de suspensión del sistema S5\n kvm: saliendo de la virtualización de hardware\n reinicio: Apagado\n\nPor cierto, este controlador está pidiendo a gritos ser limpiado para pasar una estructura de E/S adecuada que pueda ser utilizada para almacenar información entre las diferentes funciones, de lo contrario, cosas como esa volverán a ocurrir en el futuro."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/crypto/ccp/sev-dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
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"lessThan": "fa30d62ab62d8a123f20febaca4390525e2d2ad5",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "bc509293c9d4f4f74e776f4a0bbb61f63c041938",
"versionType": "git",
"status": "affected"
},
{
"version": "9770b428b1a28360663f1f5e524ee458b4cf454b",
"lessThan": "46834d90a9a13549264b9581067d8f746b4b36cc",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/crypto/ccp/sev-dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.16",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.16",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.16.9",
"lessThanOrEqual": "6.16.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.16",
"versionEndExcluding": "6.16.9",
"matchCriteriaId": "A29694A5-4AF1-4C6F-8828-187FA35BAC01"
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"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*",
"matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C"
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"matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1"
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"matchCriteriaId": "5A4516A6-C12E-42A4-8C0E-68AEF3264504"
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"references": [
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"url": "https://git.kernel.org/stable/c/46834d90a9a13549264b9581067d8f746b4b36cc",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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