CVE-2022-49377

Local privilege escalation via dangling tagset access

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel allows local users to gain kernel privileges through concurrent blk-mq I/O and queue teardown. blk_mq_get_sq_hctx derives the default hardware context through q->tag_set after a driver can free that tag set following blk_cleanup_queue, leaving a dangling mapping access. A basic local account with access to a removable block device can race I/O against teardown, leading to arbitrary kernel reads or writes or a panic.

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 allows local users to gain kernel privileges through concurrent blk-mq I/O and queue teardown. blk_mq_get_sq_hctx derives the default hardware context through q->tag_set after a driver can free that tag set following blk_cleanup_queue, leaving a dangling mapping access. A basic local account with access to a removable block device can race I/O against teardown, leading to arbitrary kernel reads or writes or a panic.

The record

CVE
CVE-2022-49377
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=5.12
  2. Affected versionversion=b6e68ee82585f2ee890b0a897a6aacbf49a467bb <460aa288c5cd0544dcf933a2f0ad0e8c6d2d35ff
  3. Affected versionversion=b6e68ee82585f2ee890b0a897a6aacbf49a467bb <5d05426e2d5fd7df8afc866b78c36b37b00188b7
  4. Affected versionversion=b6e68ee82585f2ee890b0a897a6aacbf49a467bb <70fdd922c7bf8949f8df109cf2635dff64c90392
  5. Affected versionversion=b6e68ee82585f2ee890b0a897a6aacbf49a467bb <b140bac470b4f707cda59c7266214246238661df

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=b6e68ee82585f2ee890b0a897a6aacbf49a467bb <460aa288c5cd0544dcf933a2f0ad0e8c6d2d35ff; version=b6e68ee82585f2ee890b0a897a6aacbf49a467bb <5d05426e2d5fd7df8afc866b78c36b37b00188b7; version=b6e68ee82585f2ee890b0a897a6aacbf49a467bb <70fdd922c7bf8949f8df109cf2635dff64c90392; version=b6e68ee82585f2ee890b0a897a6aacbf49a467bb <b140bac470b4f707cda59c7266214246238661df

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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
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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