CVE-2026-23058: Linux kernel · can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1105.112~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 12:55 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 5.15.0-1105.112~20.04.1, 5.15.0-1110.119~20.04.1, 5.15.0-1106.115~20.04.1 +59
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Feb 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 25.10linuxpkg:deb/ubuntu/linux@6.17.0-40.40?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws@6.17.0-1019.19?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure@6.17.0-1020.20?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde@6.17.0-1017.17?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp@6.17.0-1020.22?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle@6.17.0-1018.18?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 included in updated Linux kernel packages distributed by Ubuntu. Users should apply the official updates for their respective Ubuntu releases (20.04 LTS, 22.04 LTS, and others as listed) and reboot the system to activate the fixes. Due to an ABI change, all third-party kernel modules must be recompiled and reinstalled after updating the kernel. Follow the vendor's update instructions precisely to ensure full remediation.
Description
A memory leak vulnerability in the Linux kernel's CAN network layer driver ems_usb was fixed. The issue involved USB Request Blocks (URBs) not being properly anchored and released, causing a memory leak. This flaw was addressed by anchoring the URBs correctly in the ems_usb_read_bulk_callback() function. The vulnerability affects multiple Linux kernel versions prior to specific patched releases. Ubuntu has released updates fixing this and other kernel vulnerabilities, requiring a system reboot and recompilation of third-party kernel modules due to ABI changes.
References
- ubuntu.com/security/CVE-2026-23058 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-23058 (opens in a new tab)
- git.kernel.org/linus/0ce73a0eb5a27070957b67fd74059b6da89cc516 (opens in a new tab)
- git.kernel.org/stable/c/0ce73a0eb5a27070957b67fd74059b6da89cc516 (opens in a new tab)
- git.kernel.org/stable/c/46a191ff7eeec33a2ccb2a1bfea34e18fbc5dc1a (opens in a new tab)
- git.kernel.org/stable/c/68c62b3e53901846b5f68c5a8bade72a5d9c0b87 (opens in a new tab)
- git.kernel.org/stable/c/e9410fdd4d5f7eaa6526d8c80e83029d7c86a8e8 (opens in a new tab)
- ubuntu.com/security/notices/USN-8162-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8186-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8187-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8188-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-5 (opens in a new tab)
- ubuntu.com/security/notices/USN-8243-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-6 (opens in a new tab)
- ubuntu.com/security/notices/USN-8275-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8278-1 (opens in a new tab)