usb: typec: ucsi: validate connector number in ucsi_notify_common()
Summary
| CVE | CVE-2026-31729 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-01 15:16:35 UTC |
| Updated | 2026-05-07 16:02:57 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_notify_common() The connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a 7-bit field (0-127) that is used to index into the connector array in ucsi_connector_change(). However, the array is only allocated for the number of connectors reported by the device (typically 2-4 entries). A malicious or malfunctioning device could report an out-of-range connector number in the CCI, causing an out-of-bounds array access in ucsi_connector_change(). Add a bounds check in ucsi_notify_common(), the central point where CCI is parsed after arriving from hardware, so that bogus connector numbers are rejected before they propagate further. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.000180000 probability, percentile 0.046430000 (date 2026-05-05)
Problem Types: CWE-129
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected bdc62f2bae8fb0e8e99574de5232f0a3c54a27df f6dcbf2b024d55549959402f1db6c614e51d52cb git | Not specified |
| CNA | Linux | Linux | affected bdc62f2bae8fb0e8e99574de5232f0a3c54a27df f4e608fe12b7ac6a4a57176ab0296bb5a110a078 git | Not specified |
| CNA | Linux | Linux | affected bdc62f2bae8fb0e8e99574de5232f0a3c54a27df 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0 git | Not specified |
| CNA | Linux | Linux | affected bdc62f2bae8fb0e8e99574de5232f0a3c54a27df d2d8c17ac01a1b1f638ea5d340a884ccc5015186 git | Not specified |
| CNA | Linux | Linux | affected 5.5 | Not specified |
| CNA | Linux | Linux | unaffected 5.5 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.81 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.22 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.12 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/f6dcbf2b024d55549959402f1db6c614e51d52cb | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/d2d8c17ac01a1b1f638ea5d340a884ccc5015186 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/f4e608fe12b7ac6a4a57176ab0296bb5a110a078 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/98429e9ec89a5e3a204112dfaa2dbe6ca28493a0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.