CVE-2022-49412

Local privilege escalation via stale BFQ queue merge

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in the BFQ I/O scheduler in Linux allows local users to crash the kernel or escalate privileges through local I/O. bfq_setup_merge merges queues from a stale stable_merge_bfqq decision without rechecking their parents after cgroup reparenting, allowing an offline parent object to be freed before later scheduler use. Reachability requires a BFQ-managed block device and local access to submit I/O and manipulate a delegated cgroup hierarchy; exploitation can panic the kernel or gain kernel-level control.

CVSS severity7.8
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the BFQ I/O scheduler in Linux allows local users to crash the kernel or escalate privileges through local I/O. bfq_setup_merge merges queues from a stale stable_merge_bfqq decision without rechecking their parents after cgroup reparenting, allowing an offline parent object to be freed before later scheduler use. Reachability requires a BFQ-managed block device and local access to submit I/O and manipulate a delegated cgroup hierarchy; exploitation can panic the kernel or gain kernel-level control.

The record

CVE
CVE-2022-49412
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=430a67f9d6169a7b3e328bceb2ef9542e4153c7c <5ee21edaed09e6b25f2c007b3f326752bc89bacf
  2. Affected versionversion=430a67f9d6169a7b3e328bceb2ef9542e4153c7c <8abc8763b11c35e03cc91d59fd0cd28d39f88ca9
  3. Affected versionversion=430a67f9d6169a7b3e328bceb2ef9542e4153c7c <a16c65cca7d2c7ff965fdd3adc8df2156529caf1
  4. Affected versionversion=430a67f9d6169a7b3e328bceb2ef9542e4153c7c <c1cee4ab36acef271be9101590756ed0c0c374d9
  5. Affected versionversion=5.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=430a67f9d6169a7b3e328bceb2ef9542e4153c7c <5ee21edaed09e6b25f2c007b3f326752bc89bacf; version=430a67f9d6169a7b3e328bceb2ef9542e4153c7c <8abc8763b11c35e03cc91d59fd0cd28d39f88ca9; version=430a67f9d6169a7b3e328bceb2ef9542e4153c7c <a16c65cca7d2c7ff965fdd3adc8df2156529caf1; version=430a67f9d6169a7b3e328bceb2ef9542e4153c7c <c1cee4ab36acef271be9101590756ed0c0c374d9; version=5.13

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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