CVE-2026-90182: Linux kernel · blk-iocost: clear delay state when freeing policy data
Source GCVE Database
Not known to be exploited · fixed in b399a88eb8b16c5a1a3645fd49ff507fb82b363c : update Linux kernel when convenient.
Data as of 30 Oct 2026, 19:03 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in b399a88eb8b16c5a1a3645fd49ff507fb82b363c, b9c16db833e3ff15d923282f94dddf0e10fab8c0, 6942cb740fb17b24731728b25994eba361776011 +3
Exploitation evidence
Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
AI-suggested
A fix for this vulnerability has been implemented in the Linux kernel by explicitly clearing the delay state after freeing the policy data and canceling the associated timers. Users should apply the official kernel updates that include this fix to resolve the issue. No additional mitigations are indicated.
Description
CVE-2026-90182 is a vulnerability in the Linux kernel's blk-iocost subsystem where the delay state is not properly cleared when freeing policy data. This causes the block cgroup to remain marked as congested indefinitely, affecting all tasks in that cgroup and its descendants by throttling I/O operations such as readahead and anonymous folio allocation. The issue is resolved by explicitly clearing the delay state after removing the policy data and canceling timers.
References
- nvd.nist.gov/vuln/detail/CVE-2026-90182 (opens in a new tab)
- git.kernel.org/stable/c/6942cb740fb17b24731728b25994eba361776011 (opens in a new tab)
- git.kernel.org/stable/c/6b59f976db5def818829fc1eb4efc0a5c8c2f0cf (opens in a new tab)
- git.kernel.org/stable/c/8b4d0b1b3079bbe9a5366e2c8020eb22926733b6 (opens in a new tab)
- git.kernel.org/stable/c/97cb95d2148835ae86ff916b145aef332d40439d (opens in a new tab)
- git.kernel.org/stable/c/b399a88eb8b16c5a1a3645fd49ff507fb82b363c (opens in a new tab)
- git.kernel.org/stable/c/b9c16db833e3ff15d923282f94dddf0e10fab8c0 (opens in a new tab)