CVE-2025-39936 (GCVE-0-2025-39936)
Vulnerability from cvelistv5 – Published: 2025-10-04 07:30 – Updated: 2025-10-04 07:30
VLAI?
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/crypto/ccp/sev-dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "bc509293c9d4f4f74e776f4a0bbb61f63c041938",
"status": "affected",
"version": "9770b428b1a28360663f1f5e524ee458b4cf454b",
"versionType": "git"
},
{
"lessThan": "46834d90a9a13549264b9581067d8f746b4b36cc",
"status": "affected",
"version": "9770b428b1a28360663f1f5e524ee458b4cf454b",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/crypto/ccp/sev-dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.16"
},
{
"lessThan": "6.16",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.9",
"versionStartIncluding": "6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17",
"versionStartIncluding": "6.16",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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\u0027t 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 \u003c__sev_platform_shutdown_locked.cold\u003e:\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 \u003c8b\u003e 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 \u003cTASK\u003e\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."
}
],
"providerMetadata": {
"dateUpdated": "2025-10-04T07:30:59.857Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/bc509293c9d4f4f74e776f4a0bbb61f63c041938"
},
{
"url": "https://git.kernel.org/stable/c/46834d90a9a13549264b9581067d8f746b4b36cc"
}
],
"title": "crypto: ccp - Always pass in an error pointer to __sev_platform_shutdown_locked()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39936",
"datePublished": "2025-10-04T07:30:59.857Z",
"dateReserved": "2025-04-16T07:20:57.148Z",
"dateUpdated": "2025-10-04T07:30:59.857Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39936\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-04T08:15:46.460\",\"lastModified\":\"2025-10-06T14:56:47.823\",\"vulnStatus\":\"Awaiting Analysis\",\"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\u0027t 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 \u003c__sev_platform_shutdown_locked.cold\u003e:\\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 \u003c8b\u003e 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 \u003cTASK\u003e\\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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/46834d90a9a13549264b9581067d8f746b4b36cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc509293c9d4f4f74e776f4a0bbb61f63c041938\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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