CVE-2025-68331: Linux kernel · usb: uas: fix urb unmapping issue when the uas device is remove during ongoing data
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1103.110~20.04.1 : 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 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1103.110~20.04.1, 5.15.0-1110.119~20.04.1, 5.15.0-1103.112~20.04.1 +74
Exploitation evidence
Disclosed: evidence found.
CVE published 22 Dec 2025
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 25.10linuxpkg:deb/ubuntu/linux?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=questingOther 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 is available that fixes the error handling in the UAS driver to prevent invalid memory access during device removal. Users should apply the official Linux kernel updates that include this fix. The vendor advisory confirms the issue is resolved in updated kernel releases. No additional mitigation steps are required beyond applying the patch.
Description
A vulnerability in the Linux kernel's USB Attached SCSI (UAS) driver could cause a system panic when a UAS device is unplugged during ongoing data transfer. The issue arises from accessing invalid memory during URB callback handling due to improper error handling when device removal occurs mid-transfer. This has been fixed by modifying the error handling logic to safely complete or abort pending URBs without causing memory access errors.
References
- ubuntu.com/security/CVE-2025-68331 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-68331 (opens in a new tab)
- git.kernel.org/stable/c/26d56a9fcb2014b99e654127960aa0a48a391e3c (opens in a new tab)
- git.kernel.org/stable/c/2b90a8131c83f6f2be69397d2b7d14d217d95d2f (opens in a new tab)
- git.kernel.org/stable/c/426edbfc88b22601ea34a441a469092e7b301c52 (opens in a new tab)
- git.kernel.org/stable/c/6289fc489e94c9beb6be2b502ccc263663733d72 (opens in a new tab)
- git.kernel.org/stable/c/66ac05e7b0d6bbd1bee9fcf729e20fd4cce86d17 (opens in a new tab)
- git.kernel.org/stable/c/75f8e2643085db4f7e136fc6b368eb114dd80a64 (opens in a new tab)
- git.kernel.org/stable/c/e3a55221f4de080cb7a91ba10f01c4f708603f8d (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8100-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8116-1 (opens in a new tab)