CVE-2026-63962: Linux kernel · usb: typec: tcpm: bound altmode_desc[] per iteration in svdm_consume_modes()
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 7.0.0-1014.14~24.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 7.0.0-1014.14~24.04.1, 7.0.0-1011.11~24.04.1, 7.0.0-28.28~24.04.1 +11
Exploitation evidence
Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch for this vulnerability is available and included in recent Linux kernel updates. Users and administrators should apply the latest Linux kernel updates that include this fix to mitigate the issue. No additional mitigation actions are indicated by the vendor advisory.
Description
A vulnerability in the Linux kernel's USB Type-C Port Manager (tcpm) was resolved. The flaw involves improper bounds checking in the svdm_consume_modes() function, which can lead to out-of-bounds writes when processing unsolicited Discover Modes ACK messages from connected USB Type-C partner devices. This issue affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch addressing this vulnerability is available in recent Linux kernel updates.
References
- nvd.nist.gov/vuln/detail/CVE-2026-63962 (opens in a new tab)
- git.kernel.org/stable/c/3389c149c68c3fea61910ad5d34f7bf3bff44e32 (opens in a new tab)
- git.kernel.org/stable/c/4505f33dab56c274e82f47f94bf60a8cbf8f4b42 (opens in a new tab)
- git.kernel.org/stable/c/845598b154b9a92e9d279fafafa9405c121ae805 (opens in a new tab)
- git.kernel.org/stable/c/cbad85b446c06adbc5e5bed565871bb918ce9d32 (opens in a new tab)
- ubuntu.com/security/CVE-2026-63962 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-63962 (opens in a new tab)
- git.kernel.org/linus/3389c149c68c3fea61910ad5d34f7bf3bff44e32 (opens in a new tab)
- ubuntu.com/security/notices/USN-8593-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8603-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8618-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8663-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8664-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8728-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8728-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8728-3 (opens in a new tab)
- git.kernel.org/stable/c/816c6251409db28f1b875988fcbd2ff1764a81f0 (opens in a new tab)