CVE-2026-31697 (GCVE-0-2026-31697)
Vulnerability from cvelistv5 – Published: 2026-05-01 13:55 – Updated: 2026-10-19 18:56
VLAI
EPSS
VEX
Title
crypto: ccp: Don't attempt to copy ID to userspace if PSP command failed
Summary
In the Linux kernel, the following vulnerability has been resolved:
crypto: ccp: Don't attempt to copy ID to userspace if PSP command failed
When retrieving the ID for the CPU, don't attempt to copy the ID blob to
userspace if the firmware command failed. If the failure was due to an
invalid length, i.e. the userspace buffer+length was too small, copying
the number of bytes _firmware_ requires will overflow the kernel-allocated
buffer and leak data to userspace.
BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]
BUG: KASAN: slab-out-of-bounds in _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26
Read of size 64 at addr ffff8881867f5960 by task syz.0.906/24388
CPU: 130 UID: 0 PID: 24388 Comm: syz.0.906 Tainted: G U O 7.0.0-smp-DEV #28 PREEMPTLAZY
Tainted: [U]=USER, [O]=OOT_MODULE
Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025
Call Trace:
<TASK>
dump_stack_lvl+0xc5/0x110 ../lib/dump_stack.c:120
print_address_description ../mm/kasan/report.c:378 [inline]
print_report+0xbc/0x260 ../mm/kasan/report.c:482
kasan_report+0xa2/0xe0 ../mm/kasan/report.c:595
check_region_inline ../mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x264/0x2c0 ../mm/kasan/generic.c:200
instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]
_inline_copy_to_user ../include/linux/uaccess.h:205 [inline]
_copy_to_user+0x66/0xa0 ../lib/usercopy.c:26
copy_to_user ../include/linux/uaccess.h:236 [inline]
sev_ioctl_do_get_id2+0x361/0x490 ../drivers/crypto/ccp/sev-dev.c:2222
sev_ioctl+0x25f/0x490 ../drivers/crypto/ccp/sev-dev.c:2575
vfs_ioctl ../fs/ioctl.c:51 [inline]
__do_sys_ioctl ../fs/ioctl.c:597 [inline]
__se_sys_ioctl+0x11d/0x1b0 ../fs/ioctl.c:583
do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe0/0x800 ../arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x76/0x7e
</TASK>
WARN if the driver says the command succeeded, but the firmware error code
says otherwise, as __sev_do_cmd_locked() is expected to return -EIO on any
firwmware error.
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:12 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
9 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
d6112ea0cb344d6f5ed519991e24f69ba4b43d0e , < 99bae2e3c3f9ba8f854c938ed2c811b6a63b28e4
(git)
Affected: d6112ea0cb344d6f5ed519991e24f69ba4b43d0e , < a21ae9f8769e5f75433bb0a85ac3868b2100ef5b (git) Affected: d6112ea0cb344d6f5ed519991e24f69ba4b43d0e , < 0f1f2f9894893dc8a28af1b9e9dbc0abf453eb52 (git) Affected: d6112ea0cb344d6f5ed519991e24f69ba4b43d0e , < 09427bcb1715fb20a80b6acd5156dbf15ab5c363 (git) Affected: d6112ea0cb344d6f5ed519991e24f69ba4b43d0e , < 1fbac0429a42adec830491757a2b53956dd797ea (git) Affected: d6112ea0cb344d6f5ed519991e24f69ba4b43d0e , < 2937f17bbeefb8e7608ff1f78cffbeb3d0281e5e (git) Affected: d6112ea0cb344d6f5ed519991e24f69ba4b43d0e , < 06f06d88c05ce176c61fff8c72c372847b0dd2b5 (git) Affected: d6112ea0cb344d6f5ed519991e24f69ba4b43d0e , < 4f685dbfa87c546e51d9dc6cab379d20f275e114 (git) |
guessed | |
| Linux | Linux |
Affected:
5.2
Unaffected: 0 , < 5.2 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.84 , ≤ 6.12.* (semver) Unaffected: 6.18.25 , ≤ 6.18.* (semver) Unaffected: 7.0.2 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed |
{
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{
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"cpeApplicability": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp: Don\u0027t attempt to copy ID to userspace if PSP command failed\n\nWhen retrieving the ID for the CPU, don\u0027t attempt to copy the ID blob to\nuserspace if the firmware command failed. If the failure was due to an\ninvalid length, i.e. the userspace buffer+length was too small, copying\nthe number of bytes _firmware_ requires will overflow the kernel-allocated\nbuffer and leak data to userspace.\n\n BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n BUG: KASAN: slab-out-of-bounds in _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n Read of size 64 at addr ffff8881867f5960 by task syz.0.906/24388\n\n CPU: 130 UID: 0 PID: 24388 Comm: syz.0.906 Tainted: G U O 7.0.0-smp-DEV #28 PREEMPTLAZY\n Tainted: [U]=USER, [O]=OOT_MODULE\n Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xc5/0x110 ../lib/dump_stack.c:120\n print_address_description ../mm/kasan/report.c:378 [inline]\n print_report+0xbc/0x260 ../mm/kasan/report.c:482\n kasan_report+0xa2/0xe0 ../mm/kasan/report.c:595\n check_region_inline ../mm/kasan/generic.c:-1 [inline]\n kasan_check_range+0x264/0x2c0 ../mm/kasan/generic.c:200\n instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n copy_to_user ../include/linux/uaccess.h:236 [inline]\n sev_ioctl_do_get_id2+0x361/0x490 ../drivers/crypto/ccp/sev-dev.c:2222\n sev_ioctl+0x25f/0x490 ../drivers/crypto/ccp/sev-dev.c:2575\n vfs_ioctl ../fs/ioctl.c:51 [inline]\n __do_sys_ioctl ../fs/ioctl.c:597 [inline]\n __se_sys_ioctl+0x11d/0x1b0 ../fs/ioctl.c:583\n do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xe0/0x800 ../arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n \u003c/TASK\u003e\n\nWARN if the driver says the command succeeded, but the firmware error code\nsays otherwise, as __sev_do_cmd_locked() is expected to return -EIO on any\nfirwmware error."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable path is reached through a local ioctl on the host `/dev/sev` misc device using `SEV_ISSUE_CMD` with `SEV_GET_ID2`; it is not reachable from network packets or from SEV guests.\nAC:L - The attacker controls the supplied buffer length and can reliably make firmware return an invalid-length error that updates `data.len` beyond the allocated buffer size. No race or uncontrollable heap condition is required to trigger the out-of-bounds copy.\nPR:L - Access requires permission to open `/dev/sev`, which defaults restrictive but is reasonably granted to non-root virtualization users or service accounts via device policy. The ioctl command itself has no capability check and `SEV_GET_ID2` does not require write access.\nUI:N - Once the attacker has local access to the device node, exploitation is a direct ioctl call. No victim action is required.\nS:U - The vulnerability is in the host kernel SEV/PSP driver and impacts host kernel memory and availability within the same security authority. It is not a guest-to-host escape or IOMMU/DMA boundary bypass.\nC:H - The bug copies firmware-reported length bytes from a smaller `kzalloc()` buffer to userspace, leaking adjacent kernel heap memory. Under the requested high-severity tie-break rule, this out-of-bounds kernel read is High confidentiality impact.\nI:N - The flawed operation is an over-read from kernel memory during `copy_to_user()`. It does not write to kernel memory or provide a demonstrated data-modification primitive.\nA:H - The same out-of-bounds usercopy can trigger kernel hardening or sanitizer failures, and hardened usercopy aborts such invalid slab exposures with a BUG. This makes a kernel crash reasonably defensible."
}
]
}
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"title": "crypto: ccp: Don\u0027t attempt to copy ID to userspace if PSP command failed",
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},
{
"url": "https://git.kernel.org/stable/c/4f685dbfa87c546e51d9dc6cab379d20f275e114"
}
],
"title": "crypto: ccp: Don\u0027t attempt to copy ID to userspace if PSP command failed",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31697",
"datePublished": "2026-05-01T13:55:58.184Z",
"dateReserved": "2026-03-09T15:48:24.131Z",
"dateUpdated": "2026-10-19T18:56:05.156Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.