CVE-2025-68288: Linux kernel · usb: storage: Fix memory leak in USB bulk transport
Affects Linux kernelSource GCVE Database
Mentioned vulnerabilities
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 10% 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 16 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 and should be applied to affected Linux kernel versions. The fix zeroes out the CSW data in the transfer buffer after validation to prevent leakage. Users should update their Linux kernel to versions including this fix as indicated by their distribution's security advisories. No additional mitigation actions are specified or required beyond applying the official patch.
Description
A memory leak vulnerability in the Linux kernel's USB storage bulk transport was identified and fixed. The issue occurs when USB storage devices skip the data phase with status data, causing the kernel to leave protocol data in the transfer buffer, potentially leaking USB protocol data to user space via SCSI generic interfaces. This vulnerability affects certain Linux kernel versions prior to specific 5.15.0 updates. A patch is available that zeroes out the relevant buffer after validation to prevent the leak.
References
- ubuntu.com/security/CVE-2025-68288 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-68288 (opens in a new tab)
- git.kernel.org/linus/41e99fe2005182139b1058db71f0d241f8f0078c (opens in a new tab)
- git.kernel.org/stable/c/0f18eac44c5668204bf6eebb01ddb369ac56932b (opens in a new tab)
- git.kernel.org/stable/c/41e99fe2005182139b1058db71f0d241f8f0078c (opens in a new tab)
- git.kernel.org/stable/c/467fec3cefbeb9e3ea80f457da9a5666a71ca0d0 (opens in a new tab)
- git.kernel.org/stable/c/4ba515dfff7eeca369ab85cdbb3f3b231c71720c (opens in a new tab)
- git.kernel.org/stable/c/5b815ddb3f5560fac35b16de3a2a22d5f81c5993 (opens in a new tab)
- git.kernel.org/stable/c/83f0241959831586d9b6d47f6bd5d3dec8f43bf0 (opens in a new tab)
- git.kernel.org/stable/c/cb1401b5bcc2feb5b038fc4b512e5968b016e05e (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)