VulnerabilityPublished 24 Jun 2026Updated 6 Nov 2026

CVE-2026-53126: Linux kernel · blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in b3e005f16cd98f815429a87aef4c61e9c140779f : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in b3e005f16cd98f815429a87aef4c61e9c140779f, 23308af722fefed00af5f238024c11710938fba3, 4048ed98860d3785645ebbd34f69566a6c7320c3 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Jun 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 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f05837ed73d0c73e950b2d9f2612febb0d3d451e, < b3e005f16cd98f815429a87aef4c61e9c140779f	Fixed in b3e005f16cd98f815429a87aef4c61e9c140779f
LinuxLinux	Affected ≥ f05837ed73d0c73e950b2d9f2612febb0d3d451e, < 23308af722fefed00af5f238024c11710938fba3	Fixed in 23308af722fefed00af5f238024c11710938fba3
LinuxLinux	Affected ≥ f05837ed73d0c73e950b2d9f2612febb0d3d451e, < 4048ed98860d3785645ebbd34f69566a6c7320c3	Fixed in 4048ed98860d3785645ebbd34f69566a6c7320c3
LinuxLinux	Affected ≥ f05837ed73d0c73e950b2d9f2612febb0d3d451e, < 73a5af059905d171b398c8b2381632ee499948b5	Fixed in 73a5af059905d171b398c8b2381632ee499948b5
LinuxLinux	Affected ≥ f05837ed73d0c73e950b2d9f2612febb0d3d451e, < 000e8454692cab9d1f1b80130e2870e355301d06	Fixed in 000e8454692cab9d1f1b80130e2870e355301d06
LinuxLinux	Affected =6.3	Fixed in–

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.

References

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