CVE-2022-49411

Local kernel memory corruption via stale bfq_group

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel BFQ I/O scheduler allows local users to corrupt kernel memory through I/O queued from an offlined cgroup. BFQ inserts that offline bfq_group into a service tree, then frees it when its final associated bio completes while tree users retain the stale reference. Exploitation requires BFQ, cgroup manipulation, and local I/O activity; published evidence establishes memory-safety and service-integrity risk but no reliable privilege-escalation outcome.

CVSS severity7.8
High
EPSS probability0.29%
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 Linux kernel BFQ I/O scheduler allows local users to corrupt kernel memory through I/O queued from an offlined cgroup. BFQ inserts that offline bfq_group into a service tree, then frees it when its final associated bio completes while tree users retain the stale reference. Exploitation requires BFQ, cgroup manipulation, and local I/O activity; published evidence establishes memory-safety and service-integrity risk but no reliable privilege-escalation outcome.

The record

CVE
CVE-2022-49411
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
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=4.12
  2. Affected versionversion=e21b7a0b988772e82e7147e1c659a5afe2ae003c <075a53b78b815301f8d3dd1ee2cd99554e34f0dd
  3. Affected versionversion=e21b7a0b988772e82e7147e1c659a5afe2ae003c <51f724bffa3403a5236597e6b75df7329c1ec6e9
  4. Affected versionversion=e21b7a0b988772e82e7147e1c659a5afe2ae003c <6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0b
  5. Affected versionversion=e21b7a0b988772e82e7147e1c659a5afe2ae003c <7781c38552e6cc54ed8e9040279561340516b881
  6. Affected versionversion=e21b7a0b988772e82e7147e1c659a5afe2ae003c <97bd6c56bdcb41079e488e31df56809e3b2ce628
  7. Affected versionversion=e21b7a0b988772e82e7147e1c659a5afe2ae003c <ccddf8cd411c1800863ed357064e56ceffd356bb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=e21b7a0b988772e82e7147e1c659a5afe2ae003c <075a53b78b815301f8d3dd1ee2cd99554e34f0dd; version=e21b7a0b988772e82e7147e1c659a5afe2ae003c <51f724bffa3403a5236597e6b75df7329c1ec6e9; version=e21b7a0b988772e82e7147e1c659a5afe2ae003c <6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0b; version=e21b7a0b988772e82e7147e1c659a5afe2ae003c <7781c38552e6cc54ed8e9040279561340516b881; version=e21b7a0b988772e82e7147e1c659a5afe2ae003c <97bd6c56bdcb41079e488e31df56809e3b2ce628; version=e21b7a0b988772e82e7147e1c659a5afe2ae003c <ccddf8cd411c1800863ed357064e56ceffd356bb

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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