CVE-2026-63958

Kernel memory corruption via unchecked connector index

Published Jul 19, 2026 · Updated Jul 19, 2026

Out-of-bounds access in Linux Kernel 4.13 through affected 7.0 releases allows attackers controlling a UCSI PPM to corrupt kernel memory. ucsi_connector_change() uses the notification's 7-bit connector number to index ucsi->connector[] and calls schedule_work() without validating the index against cap.num_connectors. Exploitation requires a buggy or malicious EC firmware or I2C-attached UCSI controller and drives a work-queue operation on memory beyond the connector array.

CVSS severity7.0
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds access in Linux Kernel 4.13 through affected 7.0 releases allows attackers controlling a UCSI PPM to corrupt kernel memory. ucsi_connector_change() uses the notification's 7-bit connector number to index ucsi->connector[] and calls schedule_work() without validating the index against cap.num_connectors. Exploitation requires a buggy or malicious EC firmware or I2C-attached UCSI controller and drives a work-queue operation on memory beyond the connector array.

The record

CVE
CVE-2026-63958
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.1.176
  2. Affected versionversion=0 <6.12.93
  3. Affected versionversion=0 <6.18.35
  4. Affected versionversion=0 <6.6.143
  5. Affected versionversion=0 <7.0.12
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0edd1e21587b0483c7ceb993b9fb9668bbef7433
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <156b6f0aec6108909b0c4aedc78865b12766b347
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <288a81a8507052bcfbf884d39a463c44c42c5fd9
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5af2719b460ab904c504fc069d1dd2a3aa2b22b0
  10. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bd24d92af4ae021b6209f28e9a57e1bf2260d4fd
  11. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cea949203faef9cb783adc7b978cce056271e057

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <6.1.176; version=0 <6.12.93; version=0 <6.18.35; version=0 <6.6.143; version=0 <7.0.12; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0edd1e21587b0483c7ceb993b9fb9668bbef7433; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <156b6f0aec6108909b0c4aedc78865b12766b347; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <288a81a8507052bcfbf884d39a463c44c42c5fd9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5af2719b460ab904c504fc069d1dd2a3aa2b22b0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bd24d92af4ae021b6209f28e9a57e1bf2260d4fd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cea949203faef9cb783adc7b978cce056271e057

Published CVSS scores

6.8SUSECVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0SUSECVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo