CVE-2026-63960 (GCVE-0-2026-63960)
Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 06:41
VLAI
EPSS
VEX
Title
usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer()
Summary
In the Linux kernel, the following vulnerability has been resolved:
usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer()
wcove_read_rx_buffer() copies the PD RX FIFO into the caller's
struct pd_message with
for (i = 0; i < USBC_RXINFO_RXBYTES(info); i++)
regmap_read(wcove->regmap, USBC_RX_DATA + i, msg + i);
which has two problems:
USBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message
is 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed).
The byte count latched in RXINFO is the number of bytes the port partner
put on the wire, so a malicious partner that transmits a 31-byte frame
can drive the loop one byte past the destination if the WCOVE BMC
receiver does not enforce the PD object-count limit in hardware. The
existing FIXME flagged this as unverified.
Independently, regmap_read() takes an unsigned int * and stores a full
unsigned int at the destination. Passing the byte pointer msg + i means
each iteration writes four bytes; the high three are zero (val_bits is
8) and are normally overwritten by the next iteration, but the final
iteration's high bytes are not. With RXBYTES == 30 the i == 29 iteration
already writes three zero bytes past msg, which sits on the IRQ thread's
stack in wcove_typec_irq().
Clamp the loop to sizeof(struct pd_message) and read each register into
a local before storing only its low byte, so the copy can never exceed
the destination regardless of what RXINFO reports.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3c4fb9f169214290ec9a943907321e6265b36f65 , < 3e632098d0521257ea965bbd6fde807d9bee5c8a
(git)
Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < f2a1edc0bd142edabc6c85d88713f2bc178dd317 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 5cd0e7ac4eefbdb330f8c72694fe74e63df65552 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < d0e4b8b3c6b7607a16932556eaaca5d5cf69f192 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < e94933dc41b87503bf585c8c6d53d740620eceb9 (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 3f9d50c8b02b4af0646aa892465080f9061fc89c (git) Affected: 3c4fb9f169214290ec9a943907321e6265b36f65 , < 4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa (git) |
guessed | |
| Linux | Linux |
Affected:
4.15
Unaffected: 0 , < 4.15 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/usb/typec/tcpm/wcove.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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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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{
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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": "4.15"
},
{
"lessThan": "4.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.93",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.259",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.210",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.176",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.93",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.35",
"versionStartIncluding": "4.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.12",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
"versionStartIncluding": "4.15",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()\n\nwcove_read_rx_buffer() copies the PD RX FIFO into the caller\u0027s\nstruct pd_message with\n\n\tfor (i = 0; i \u003c USBC_RXINFO_RXBYTES(info); i++)\n\t\tregmap_read(wcove-\u003eregmap, USBC_RX_DATA + i, msg + i);\n\nwhich has two problems:\n\nUSBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message\nis 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed).\nThe byte count latched in RXINFO is the number of bytes the port partner\nput on the wire, so a malicious partner that transmits a 31-byte frame\ncan drive the loop one byte past the destination if the WCOVE BMC\nreceiver does not enforce the PD object-count limit in hardware. The\nexisting FIXME flagged this as unverified.\n\nIndependently, regmap_read() takes an unsigned int * and stores a full\nunsigned int at the destination. Passing the byte pointer msg + i means\neach iteration writes four bytes; the high three are zero (val_bits is\n8) and are normally overwritten by the next iteration, but the final\niteration\u0027s high bytes are not. With RXBYTES == 30 the i == 29 iteration\nalready writes three zero bytes past msg, which sits on the IRQ thread\u0027s\nstack in wcove_typec_irq().\n\nClamp the loop to sizeof(struct pd_message) and read each register into\na local before storing only its low byte, so the copy can never exceed\nthe destination regardless of what RXINFO reports."
}
],
"providerMetadata": {
"dateUpdated": "2026-07-20T06:41:40.389Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3e632098d0521257ea965bbd6fde807d9bee5c8a"
},
{
"url": "https://git.kernel.org/stable/c/f2a1edc0bd142edabc6c85d88713f2bc178dd317"
},
{
"url": "https://git.kernel.org/stable/c/6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22"
},
{
"url": "https://git.kernel.org/stable/c/5cd0e7ac4eefbdb330f8c72694fe74e63df65552"
},
{
"url": "https://git.kernel.org/stable/c/d0e4b8b3c6b7607a16932556eaaca5d5cf69f192"
},
{
"url": "https://git.kernel.org/stable/c/e94933dc41b87503bf585c8c6d53d740620eceb9"
},
{
"url": "https://git.kernel.org/stable/c/3f9d50c8b02b4af0646aa892465080f9061fc89c"
},
{
"url": "https://git.kernel.org/stable/c/4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa"
}
],
"title": "usb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-63960",
"datePublished": "2026-07-19T14:55:50.282Z",
"dateReserved": "2026-07-19T07:54:57.023Z",
"dateUpdated": "2026-07-20T06:41:40.389Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-63960",
"date": "2026-10-04",
"epss": "0.0022",
"percentile": "0.11278"
},
"microsoft_vex": {
"current_release_date": "2026-07-21T01:03:29.000Z",
"cve": "CVE-2026-63960",
"id": "msrc_CVE-2026-63960",
"initial_release_date": "2026-07-21T01:03:29.000Z",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "usb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63960.json",
"version": "1"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/usb/typec/tcpm/wcove.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "3e632098d0521257ea965bbd6fde807d9bee5c8a",
"status": "affected",
"version": "3c4fb9f169214290ec9a943907321e6265b36f65",
"versionType": "git"
},
{
"lessThan": "f2a1edc0bd142edabc6c85d88713f2bc178dd317",
"status": "affected",
"version": "3c4fb9f169214290ec9a943907321e6265b36f65",
"versionType": "git"
},
{
"lessThan": "6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22",
"status": "affected",
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"versionType": "git"
},
{
"lessThan": "5cd0e7ac4eefbdb330f8c72694fe74e63df65552",
"status": "affected",
"version": "3c4fb9f169214290ec9a943907321e6265b36f65",
"versionType": "git"
},
{
"lessThan": "d0e4b8b3c6b7607a16932556eaaca5d5cf69f192",
"status": "affected",
"version": "3c4fb9f169214290ec9a943907321e6265b36f65",
"versionType": "git"
},
{
"lessThan": "e94933dc41b87503bf585c8c6d53d740620eceb9",
"status": "affected",
"version": "3c4fb9f169214290ec9a943907321e6265b36f65",
"versionType": "git"
},
{
"lessThan": "3f9d50c8b02b4af0646aa892465080f9061fc89c",
"status": "affected",
"version": "3c4fb9f169214290ec9a943907321e6265b36f65",
"versionType": "git"
},
{
"lessThan": "4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa",
"status": "affected",
"version": "3c4fb9f169214290ec9a943907321e6265b36f65",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/usb/typec/tcpm/wcove.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.15"
},
{
"lessThan": "4.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.93",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()\n\nwcove_read_rx_buffer() copies the PD RX FIFO into the caller\u0027s\nstruct pd_message with\n\n\tfor (i = 0; i \u003c USBC_RXINFO_RXBYTES(info); i++)\n\t\tregmap_read(wcove-\u003eregmap, USBC_RX_DATA + i, msg + i);\n\nwhich has two problems:\n\nUSBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message\nis 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed).\nThe byte count latched in RXINFO is the number of bytes the port partner\nput on the wire, so a malicious partner that transmits a 31-byte frame\ncan drive the loop one byte past the destination if the WCOVE BMC\nreceiver does not enforce the PD object-count limit in hardware. The\nexisting FIXME flagged this as unverified.\n\nIndependently, regmap_read() takes an unsigned int * and stores a full\nunsigned int at the destination. Passing the byte pointer msg + i means\neach iteration writes four bytes; the high three are zero (val_bits is\n8) and are normally overwritten by the next iteration, but the final\niteration\u0027s high bytes are not. With RXBYTES == 30 the i == 29 iteration\nalready writes three zero bytes past msg, which sits on the IRQ thread\u0027s\nstack in wcove_typec_irq().\n\nClamp the loop to sizeof(struct pd_message) and read each register into\na local before storing only its low byte, so the copy can never exceed\nthe destination regardless of what RXINFO reports."
}
],
"id": "CVE-2026-63960",
"lastModified": "2026-07-30T14:51:11.223",
"metrics": {},
"published": "2026-07-19T16:17:14.897",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3e632098d0521257ea965bbd6fde807d9bee5c8a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3f9d50c8b02b4af0646aa892465080f9061fc89c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5cd0e7ac4eefbdb330f8c72694fe74e63df65552"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d0e4b8b3c6b7607a16932556eaaca5d5cf69f192"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e94933dc41b87503bf585c8c6d53d740620eceb9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f2a1edc0bd142edabc6c85d88713f2bc178dd317"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
},
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-08-07T13:50:20+00:00",
"cve": "CVE-2026-63960",
"id": "CVE-2026-63960",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: usb: typec: wcove: don\u0027t write past struct pd_message in wcove_read_rx_buffer()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63960.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-01T00:47:29Z",
"cve": "CVE-2026-63960",
"id": "CVE-2026-63960",
"initial_release_date": "2026-07-21T13:02:42Z",
"product_status:known_affected": "580",
"product_status:known_not_affected": "143",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-63960",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63960.json",
"version": "11"
}
}
}
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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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