CVE-2026-53126 Details
Description
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current() Add the missing put_disk() on the error path in blkcg_maybe_throttle_current(). When blkcg lookup, blkg lookup, or blkg_tryget() fails, the function jumps to the out label which only calls rcu_read_unlock() but does not release the disk reference acquired by blkcg_schedule_throttle() via get_device(). Since current->throttle_disk is already set to NULL before the lookup, blkcg_exit() cannot release this reference either, causing the disk to never be freed. Restore the reference release that was present as blk_put_queue() in the original code but was inadvertently dropped during the conversion from request_queue to gendisk.
A vulnerability has been identified in the Linux kernel's block cgroup management, specifically in the function 'blkcg_maybe_throttle_current()'. This issue arises from a disk reference leak that occurs when the function encounters an error while looking up block cgroup or trying to acquire a block group reference. In such cases, the function fails to release the disk reference it had previously acquired, leading to a situation where the disk is never freed. The problem stems from a change in how disk references are managed, which inadvertently removed a necessary cleanup step. As a result, the kernel's resource management is compromised, potentially leading to degraded system performance or resource exhaustion.
Users can apply the latest patches available in the Linux kernel stable tree to address this vulnerability. The specific commit that resolves the issue is '23308af722fefed00af5f238024c11710938fba3', which can be found in the official Linux kernel Git repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06 | kernel.org | Patch |
| https://git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-Other | Weakness Not in a Standard CWE Category | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.3, < 6.6.141 >= 6.7, < 6.12.91 >= 6.13, < 6.18.33 >= 6.19, < 7.0.10 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | Initial Analysis | [email protected] |
| Jun 24, 2026 | New CVE Received | kernel.org |