CVE-2026-80652 (GCVE-0-2026-80652)
Vulnerability from cvelistv5
Published
2026-08-28 06:49
Modified
2026-08-28 06:49
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
crypto: ccp - Treat zero-length cert chain as query for blob lengths
When handling a PDH export, treat a zero-length userspace cert chain buffer
as a request to query the length of the relevant blobs. Failure to account
for the zero-length buffer trips a BUG_ON() when running with
CONFIG_DEBUG_VIRTUAL=y due to trying to get the physical address of the
ZERO_SIZE_PTR (returned by kzalloc() on the bogus allocation).
kernel BUG at arch/x86/mm/physaddr.c:28 !
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 30 UID: 0 PID: 28580 Comm: syz.2.18 Kdump: loaded
Tainted: G W 6.18.16-smp-DEV #1 NONE
Tainted: [W]=WARN
Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025
RIP: 0010:__phys_addr+0x16a/0x180 arch/x86/mm/physaddr.c:28
RSP: 0018:ffffc9008329fc80 EFLAGS: 00010293
RAX: ffffffff8179110a RBX: 0000778000000010 RCX: ffff8884e6992600
RDX: 0000000000000000 RSI: 0000000080000010 RDI: 0000778000000010
RBP: ffffc9008329fdf0 R08: 0000000000000dc0 R09: 00000000ffffffff
R10: dffffc0000000000 R11: fffffbfff126d297 R12: dffffc0000000000
R13: 1ffff92010653fc8 R14: 0000000080000010 R15: dffffc0000000000
FS: 0000555556bec9c0(0000) GS:ffff88aa4ce1c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd3159e7000 CR3: 00000004fbc44000 CR4: 0000000000350ef0
Call Trace:
<TASK>
[<ffffffff853d3869>] sev_ioctl_do_pdh_export+0x559/0x7a0 drivers/crypto/ccp/sev-dev.c:2308
[<ffffffff853d1fdd>] sev_ioctl+0x2cd/0x480 drivers/crypto/ccp/sev-dev.c:2556
[<ffffffff82549ebc>] vfs_ioctl fs/ioctl.c:52 [inline]
[<ffffffff82549ebc>] __do_sys_ioctl fs/ioctl.c:598 [inline]
[<ffffffff82549ebc>] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
[<ffffffff8630115f>] do_syscall_x64 arch/x86/entry/syscall_64.c:64 [inline]
[<ffffffff8630115f>] do_syscall_64+0x9f/0xf40 arch/x86/entry/syscall_64.c:98
[<ffffffff81000136>] entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd3158eac39
</TASK>
Thankfully, the bug is benign outside of CONFIG_DEBUG_VIRTUAL=y as getting
the physical address is just arithmetic, and the PSP errors out before
trying to write to the garbage address (which it must, otherwise querying
the blob lengths would clobber memory at pfn=0).
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 Version: 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 Version: 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 Version: 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 Version: 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 Version: 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 Version: 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 Version: 76a2b524a4b1d6dc0f2421f9854a01d55d5e5436 |
||
{
"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": [
{
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"status": "affected",
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"versionType": "git"
},
{
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},
{
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"versionType": "git"
},
{
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{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"lessThan": "4.16",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "4.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
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"vulnerable": true
},
{
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{
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"vulnerable": true
},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Treat zero-length cert chain as query for blob lengths\n\nWhen handling a PDH export, treat a zero-length userspace cert chain buffer\nas a request to query the length of the relevant blobs. Failure to account\nfor the zero-length buffer trips a BUG_ON() when running with\nCONFIG_DEBUG_VIRTUAL=y due to trying to get the physical address of the\nZERO_SIZE_PTR (returned by kzalloc() on the bogus allocation).\n\n kernel BUG at arch/x86/mm/physaddr.c:28 !\n Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n CPU: 30 UID: 0 PID: 28580 Comm: syz.2.18 Kdump: loaded\n Tainted: G W 6.18.16-smp-DEV #1 NONE\n Tainted: [W]=WARN\n Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025\n RIP: 0010:__phys_addr+0x16a/0x180 arch/x86/mm/physaddr.c:28\n RSP: 0018:ffffc9008329fc80 EFLAGS: 00010293\n RAX: ffffffff8179110a RBX: 0000778000000010 RCX: ffff8884e6992600\n RDX: 0000000000000000 RSI: 0000000080000010 RDI: 0000778000000010\n RBP: ffffc9008329fdf0 R08: 0000000000000dc0 R09: 00000000ffffffff\n R10: dffffc0000000000 R11: fffffbfff126d297 R12: dffffc0000000000\n R13: 1ffff92010653fc8 R14: 0000000080000010 R15: dffffc0000000000\n FS: 0000555556bec9c0(0000) GS:ffff88aa4ce1c000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007fd3159e7000 CR3: 00000004fbc44000 CR4: 0000000000350ef0\n Call Trace:\n \u003cTASK\u003e\n [\u003cffffffff853d3869\u003e] sev_ioctl_do_pdh_export+0x559/0x7a0 drivers/crypto/ccp/sev-dev.c:2308\n [\u003cffffffff853d1fdd\u003e] sev_ioctl+0x2cd/0x480 drivers/crypto/ccp/sev-dev.c:2556\n [\u003cffffffff82549ebc\u003e] vfs_ioctl fs/ioctl.c:52 [inline]\n [\u003cffffffff82549ebc\u003e] __do_sys_ioctl fs/ioctl.c:598 [inline]\n [\u003cffffffff82549ebc\u003e] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584\n [\u003cffffffff8630115f\u003e] do_syscall_x64 arch/x86/entry/syscall_64.c:64 [inline]\n [\u003cffffffff8630115f\u003e] do_syscall_64+0x9f/0xf40 arch/x86/entry/syscall_64.c:98\n [\u003cffffffff81000136\u003e] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n RIP: 0033:0x7fd3158eac39\n \u003c/TASK\u003e\n\nThankfully, the bug is benign outside of CONFIG_DEBUG_VIRTUAL=y as getting\nthe physical address is just arithmetic, and the PSP errors out before\ntrying to write to the garbage address (which it must, otherwise querying\nthe blob lengths would clobber memory at pfn=0)."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-28T06:49:00.093Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1c587f30c6242cc37b3d6ee6d91daef84e51633f"
},
{
"url": "https://git.kernel.org/stable/c/13b4d5e055d344e34b864bced0a591ceaac7ad81"
},
{
"url": "https://git.kernel.org/stable/c/94344bc7c9d70b04be718d841b92873aa3ea8191"
},
{
"url": "https://git.kernel.org/stable/c/50c3c7df4f26d36b30bc950a7d780f7029fd52f8"
},
{
"url": "https://git.kernel.org/stable/c/ee717e73ab47253c82c134c342e32fcdfcfccd87"
},
{
"url": "https://git.kernel.org/stable/c/21650fe221ea9b72809140b691589dde8bff3eab"
},
{
"url": "https://git.kernel.org/stable/c/d88071a6ce091272726bedda26c105b85b23705f"
},
{
"url": "https://git.kernel.org/stable/c/ef8c9dacda2871accd64e3eda951fef6b788b1ea"
}
],
"title": "crypto: ccp - Treat zero-length cert chain as query for blob lengths",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80652",
"datePublished": "2026-08-28T06:49:00.093Z",
"dateReserved": "2026-08-26T14:34:25.779Z",
"dateUpdated": "2026-08-28T06:49:00.093Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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