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NVD / CVE Program· CNA Linux

CVE-2026-31729: usb: typec: ucsi: validate connector number in ucsi_notify_common()

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0, d2d8c17ac01a1b1f638ea5d340a884ccc5015186, f4e608fe12b7ac6a4a57176ab0296bb5a110a078.

Low priority for now. Upgrade to Linux Linux 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0, d2d8c17ac01a1b1f638ea5d340a884ccc5015186, f4e608fe12b7ac6a4a57176ab0296bb5a110a078 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-31729

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.5 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.5affected
    • bdc62f2bae8fb0e8e99574de5232f0a3c54a27df and later · before f6dcbf2b024d55549959402f1db6c614e51d52cbaffected · git
    • bdc62f2bae8fb0e8e99574de5232f0a3c54a27df and later · before f4e608fe12b7ac6a4a57176ab0296bb5a110a078affected · git
    • bdc62f2bae8fb0e8e99574de5232f0a3c54a27df and later · before 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0affected · git
    • bdc62f2bae8fb0e8e99574de5232f0a3c54a27df and later · before d2d8c17ac01a1b1f638ea5d340a884ccc5015186affected · git
    • before 5.5not affected · semver
    • 6.12.81 and later · up to and including 6.12.*not affected · semver
    • 6.18.22 and later · up to and including 6.18.*not affected · semver
    • 6.19.12 and later · up to and including 6.19.*not affected · semver
    • 7.0 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1
SUSE:Linux Enterprise Server 16.0kernel-azurebefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Enterprise Server 16.0kernel-docsbefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Enterprise Server 16.0kernel-kvmsmallbefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Enterprise Server 16.0kernel-obs-qabefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Enterprise Server 16.0kernel-zfcpdumpbefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Micro 6.2kernel-64kbbefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Micro 6.2kernel-defaultbefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Micro 6.2kernel-default-basebefore 6.12.0-160000.34.1.160000.2.156.12.0-160000.34.1.160000.2.15
SUSE:Linux Micro 6.2kernel-rtbefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Micro 6.2kernel-sourcebefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Micro Extras 6.2kernel-obs-buildbefore 6.12.0-160000.34.16.12.0-160000.34.1
SUSE:Linux Micro Extras 6.2kernel-symsbefore 6.12.0-160000.34.16.12.0-160000.34.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-31724May 1, 2026 · usb: gadget: f_eem: Fix net_device lifecycle with device_move
    22Monitor
  • ← EarlierCVE-2026-31725May 1, 2026 · usb: gadget: f_ecm: Fix net_device lifecycle with device_move
    22Monitor
  • Later →CVE-2026-31731May 1, 2026 · thermal: core: Address thermal zone removal races with resume
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux98429e9ec89a5e3a204112dfaa2dbe6ca28493a0Vendor (CNA)
Linux Linuxd2d8c17ac01a1b1f638ea5d340a884ccc5015186Vendor (CNA)
Linux Linuxf4e608fe12b7ac6a4a57176ab0296bb5a110a078Vendor (CNA)
Linux Linuxf6dcbf2b024d55549959402f1db6c614e51d52cbVendor (CNA)
debian:linux6.12.85-1 · Debian:13Package registry (OSV)
suse:kernel-64kb6.12.0-160000.34.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-azure6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-default6.12.0-160000.34.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default-base6.12.0-160000.34.1.160000.2.15 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.34.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-rt6.12.0-160000.34.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-source6.12.0-160000.34.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-syms6.12.0-160000.34.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-zfcpdump6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-6401879 days apartnet: mana: validate rx_req_idx to prevent out-of-bounds array access
    37Monitor
  • CVE-2026-431105 days apartwifi: brcmfmac: validate bsscfg indices in IF events
    35Monitor
  • CVE-2026-431725 days apartwifi: iwlwifi: fix 22000 series SMEM parsing
    35Monitor
  • CVE-2026-2324644 days apartwifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
    35Monitor
  • CVE-2026-317640 days apartiio: imu: st_lsm6dsx: Set buffer sampling frequency for accelerometer only
    31Monitor
  • CVE-2026-317760 days apartALSA: ctxfi: Fix missing SPDIFI1 index handling
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-129 · Improper Validation of Array Index

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records