CVE-2026-63928: Linux kernel · USB: serial: omninet: fix memory corruption with small endpoint
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1117.124~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1117.124~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1122.131~20.04.1 +65
Exploitation evidence
Disclosed: evidence found.
CVE published 20 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 fix is available and has been released in updated Linux kernel packages. Users should update their Linux kernel to the patched versions listed and reboot their systems to apply the fix. No additional mitigation steps are indicated by the vendor advisory.
Description
A memory corruption vulnerability was identified and fixed in the Linux kernel's USB serial omninet driver. The flaw involved bulk-out buffers being smaller than the hardcoded transfer size, which could allow a malicious USB device reporting a smaller endpoint max packet size to cause slab corruption. The issue has been addressed in updated Linux kernel packages. Users are advised to update to the fixed kernel versions and reboot to apply the patches.
References
- nvd.nist.gov/vuln/detail/CVE-2026-63928 (opens in a new tab)
- git.kernel.org/stable/c/0bda1893e4cc4ad2b7dcdbaca246f2af688c6c2a (opens in a new tab)
- git.kernel.org/stable/c/0fee0ccac29e088d4bfab7e2d075725dcecd803d (opens in a new tab)
- git.kernel.org/stable/c/180996f0ca774001944e4afa452d569ba2f6455c (opens in a new tab)
- git.kernel.org/stable/c/4e7d32189d6219beb7db37cd0ea36b6bac7dfedb (opens in a new tab)
- git.kernel.org/stable/c/60df93d30f9bdd27db17c4d80ed80ef718d7226b (opens in a new tab)
- git.kernel.org/stable/c/9a3860454bdfb765f936965e975c594352602ffc (opens in a new tab)
- git.kernel.org/stable/c/b496e25ead5976bce2891dacaed09beb53a54f9f (opens in a new tab)
- git.kernel.org/stable/c/f34cf2928387fba01a78381f3258c7e1428897d9 (opens in a new tab)
- ubuntu.com/security/CVE-2026-63928 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-63928 (opens in a new tab)
- git.kernel.org/linus/60df93d30f9bdd27db17c4d80ed80ef718d7226b (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)
- ubuntu.com/security/notices/USN-8878-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8879-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8877-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8903-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8905-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8906-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8904-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8903-2 (opens in a new tab)