CVE-2022-49176

Kernel memory corruption via stale BFQ queue pointer

Published Feb 26, 2025 · Updated Aug 12, 2026

Use-after-free in affected Linux kernel BFQ I/O scheduler releases before 5.18 allows local users to access freed queue memory. bfq_dispatch_request retains the in-service queue pointer while dispatch can expire and free that queue, then dereferences the stale pointer when checking request state or updating statistics. The path requires local I/O on a block device using BFQ, and exploitation can crash the host or compromise kernel execution.

CVSS severity7.8
High
EPSS probability0.27%
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 affected Linux kernel BFQ I/O scheduler releases before 5.18 allows local users to access freed queue memory. bfq_dispatch_request retains the in-service queue pointer while dispatch can expire and free that queue, then dereferences the stale pointer when checking request state or updating statistics. The path requires local I/O on a block device using BFQ, and exploitation can crash the host or compromise kernel execution.

The record

CVE
CVE-2022-49176
Published
Feb 26, 2025
Updated
Aug 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=24bfd19bb7890255693ee5cb6dc100d8d215d00b <080665e2c3cbfc68359b9a348a3546ed9b908e7a
  2. Affected versionversion=24bfd19bb7890255693ee5cb6dc100d8d215d00b <40b4ba0030e0b02cbacd424ebb9f4c8b0976c786
  3. Affected versionversion=24bfd19bb7890255693ee5cb6dc100d8d215d00b <5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6
  4. Affected versionversion=24bfd19bb7890255693ee5cb6dc100d8d215d00b <5687958bf18f84384d809f521210d0f5deed03b0
  5. Affected versionversion=24bfd19bb7890255693ee5cb6dc100d8d215d00b <74e610b5ee0d95e751280567100509eb11517efa
  6. Affected versionversion=24bfd19bb7890255693ee5cb6dc100d8d215d00b <ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a
  7. Affected versionversion=24bfd19bb7890255693ee5cb6dc100d8d215d00b <df6e00b1a53c57dca82c63b5ecbcad5452231bc7
  8. Affected versionversion=4.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=24bfd19bb7890255693ee5cb6dc100d8d215d00b <080665e2c3cbfc68359b9a348a3546ed9b908e7a; version=24bfd19bb7890255693ee5cb6dc100d8d215d00b <40b4ba0030e0b02cbacd424ebb9f4c8b0976c786; version=24bfd19bb7890255693ee5cb6dc100d8d215d00b <5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6; version=24bfd19bb7890255693ee5cb6dc100d8d215d00b <5687958bf18f84384d809f521210d0f5deed03b0; version=24bfd19bb7890255693ee5cb6dc100d8d215d00b <74e610b5ee0d95e751280567100509eb11517efa; version=24bfd19bb7890255693ee5cb6dc100d8d215d00b <ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a; version=24bfd19bb7890255693ee5cb6dc100d8d215d00b <df6e00b1a53c57dca82c63b5ecbcad5452231bc7; version=4.15

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

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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
PrivilegesUnavailable
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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