CVE-2026-23032: Linux kernel · null_blk: fix kmemleak by releasing references to fault configfs items
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 6.8.0-1057.60~22.04.1 : 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 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 6.8.0-1057.60~22.04.1, 6.8.0-1059.65~22.04.1, 6.8.0-1058.65~22.04.1 +37
Exploitation evidence
Disclosed: evidence found.
CVE published 31 Jan 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?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
An official patch is available and should be applied to affected Linux kernel versions to resolve the memory leak. Users should update to the fixed kernel versions as provided by their distribution vendor. No additional mitigation actions are specified or required beyond applying the patch.
Description
A memory leak vulnerability in the Linux kernel's null_blk driver was fixed by releasing references to fault injection configfs items when the nullbX device is removed. This issue occurs when CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION is enabled, causing kmemleak to report unreferenced objects due to unreleased references. The vulnerability affects specific Linux kernel versions and has been addressed with an official patch.
References
- ubuntu.com/security/CVE-2026-23032 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-23032 (opens in a new tab)
- git.kernel.org/linus/40b94ec7edbbb867c4e26a1a43d2b898f04b93c5 (opens in a new tab)
- git.kernel.org/stable/c/1a3286edf4d48ce37f8982ff3c3b65159a5ecbb2 (opens in a new tab)
- git.kernel.org/stable/c/40b94ec7edbbb867c4e26a1a43d2b898f04b93c5 (opens in a new tab)
- git.kernel.org/stable/c/d59ba448ccd595d5d65e197216cf781a87db2b28 (opens in a new tab)
- git.kernel.org/stable/c/f1718da051282698aa8fa150bebb9724f6389fda (opens in a new tab)
- ubuntu.com/security/notices/USN-8278-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8289-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8296-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8296-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8289-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8278-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8393-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8440-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8499-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8570-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8594-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8604-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8605-1 (opens in a new tab)