CVE-2024-35924 (GCVE-0-2024-35924)
Vulnerability from cvelistv5 – Published: 2024-05-19 10:10 – Updated: 2026-08-05 11:31
VLAI
EPSS
VEX
Title
usb: typec: ucsi: Limit read size on v1.2
Summary
In the Linux kernel, the following vulnerability has been resolved:
usb: typec: ucsi: Limit read size on v1.2
Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was
increased from 16 to 256. In order to avoid overflowing reads for older
systems, add a mechanism to use the read UCSI version to truncate read
sizes on UCSI v1.2.
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-20 15:11 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < 266f403ec47573046dee4bcebda82777ce702c40
(git)
Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < 0defcaa09d3b21e8387829ee3a652c43fa91e13f (git) Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < b3db266fb031fba88c423d4bb8983a73a3db6527 (git) |
guessed | |
| Linux | Linux |
Affected:
5.5
Unaffected: 0 , < 5.5 (semver) Unaffected: 6.6.27 , ≤ 6.6.* (semver) Unaffected: 6.8.6 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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"url": "https://git.kernel.org/stable/c/0defcaa09d3b21e8387829ee3a652c43fa91e13f"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/b3db266fb031fba88c423d4bb8983a73a3db6527"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-35924",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-05-20T15:11:13.299971Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-05-23T19:01:24.910Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/usb/typec/ucsi/ucsi.c",
"drivers/usb/typec/ucsi/ucsi.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "266f403ec47573046dee4bcebda82777ce702c40",
"status": "affected",
"version": "bdc62f2bae8fb0e8e99574de5232f0a3c54a27df",
"versionType": "git"
},
{
"lessThan": "0defcaa09d3b21e8387829ee3a652c43fa91e13f",
"status": "affected",
"version": "bdc62f2bae8fb0e8e99574de5232f0a3c54a27df",
"versionType": "git"
},
{
"lessThan": "b3db266fb031fba88c423d4bb8983a73a3db6527",
"status": "affected",
"version": "bdc62f2bae8fb0e8e99574de5232f0a3c54a27df",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/usb/typec/ucsi/ucsi.c",
"drivers/usb/typec/ucsi/ucsi.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.5"
},
{
"lessThan": "5.5",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.27",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
"version": "6.8.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.27",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8.6",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.9",
"versionStartIncluding": "5.5",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: Limit read size on v1.2\n\nBetween UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was\nincreased from 16 to 256. In order to avoid overflowing reads for older\nsystems, add a mechanism to use the read UCSI version to truncate read\nsizes on UCSI v1.2."
}
],
"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 UCSI core is a local platform driver (ACPI OpRegion, I2C, or pmic_glink transport) with no network or adjacent-network exposure; the over-read is driven by local UCSI transactions and the leaked bytes are harvested locally through /sys/class/typec and /sys/class/power_supply attributes or the UCSI debugfs response file.\nAC:L - There is no race and no dependence on memory layout the attacker cannot influence \u2014 any UCSI command requesting more than 16 bytes on a PPM reporting version \u22641.2 deterministically reads past the MESSAGE_IN window, and UCSI 1.x PPMs were the common case on shipping hardware.\nPR:L - The typec class attributes populated from the over-read buffers (usb_power_delivery_revision, number_of_alternate_modes, power_operation_mode, supported_accessory_modes) and the ucsi power-supply properties derived from src_pdos are all DEVICE_ATTR_RO/0444, so an ordinary unprivileged local user can read the disclosed bytes; no capability or root is required to observe the leak.\nUI:N - The oversized MESSAGE_IN reads are issued by the driver itself during registration, resume, and connector-change work handling; no victim action is needed for the out-of-bounds access to occur or for its results to be exposed.\nS:U - The out-of-bounds read stays within the kernel\u0027s own memory (memremap\u0027d OpRegion, or the slab objects backing struct pmic_glink_ucsi / struct ucsi_ccg) and is consumed by the same kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to 240 bytes beyond the 16-byte MESSAGE_IN window can be copied out \u2014 past read_buf[48] inside struct pmic_glink_ucsi, past the trailing op_data member of struct ucsi_ccg, or past the ACPI OpRegion \u2014 which is far more than a strictly bounded few-byte read and can expose adjacent heap contents (including pointers) through world-readable sysfs.\nI:N - The defect is purely an over-long read; every destination buffer is sized to the requested length, so no out-of-bounds write, allocation-size confusion, or control-flow corruption primitive is created.\nA:H - Reading hundreds of bytes past the end of a memremap\u0027d ACPI/MMIO OpRegion can fault on platforms where the mapping does not extend that far, and the slab over-reads in the ccg and glink backends trip KASAN, so the bug can take the machine down."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:31:01.698Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/266f403ec47573046dee4bcebda82777ce702c40"
},
{
"url": "https://git.kernel.org/stable/c/0defcaa09d3b21e8387829ee3a652c43fa91e13f"
},
{
"url": "https://git.kernel.org/stable/c/b3db266fb031fba88c423d4bb8983a73a3db6527"
}
],
"title": "usb: typec: ucsi: Limit read size on v1.2",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-35924",
"datePublished": "2024-05-19T10:10:35.044Z",
"dateReserved": "2024-05-17T13:50:33.125Z",
"dateUpdated": "2026-08-05T11:31:01.698Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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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.
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