CVE-2025-40146: Linux kernel · blk-mq: fix potential deadlock while nr_requests grown
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 6.17.0-1007.7~24.04.1 : patch Linux kernel soon.
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 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 6.17.0-1007.7~24.04.1, 6.17.0-1008.8~24.04.1, 6.17.0-1008.8 +6
Exploitation evidence
Disclosed: evidence found.
CVE published 12 Nov 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@6.17.0-14.14?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws@6.17.0-1007.7?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure@6.17.0-1008.8?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@6.17.0-1007.7?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle@6.17.0-1007.7?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 fix is available and included in updated linux-aws kernel packages. Users should apply the official kernel updates provided by their distribution, such as the Ubuntu security notice USN-8029-1. No additional mitigation steps are indicated beyond applying the official patches.
Description
A potential deadlock vulnerability in the Linux kernel's blk-mq subsystem was resolved. The issue involved allocating and freeing sched_tags while the queue was frozen, which could cause a deadlock. The fix involves allocating memory before freezing the queue and freeing it after the queue is unfrozen. This vulnerability affects the linux-aws kernel versions prior to certain 6.17.0 builds. Multiple security issues in the Linux kernel, including this one, were addressed in a comprehensive update.
References
- ubuntu.com/security/CVE-2025-40146 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-40146 (opens in a new tab)
- git.kernel.org/linus/b86433721f46d934940528f28d49c1dedb690df1 (opens in a new tab)
- git.kernel.org/stable/c/8d26acf8477174d8ef690eb6affe13a630f586ae (opens in a new tab)
- git.kernel.org/stable/c/b86433721f46d934940528f28d49c1dedb690df1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8029-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8030-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8029-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8048-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8029-3 (opens in a new tab)