CVE-2022-49541

Kernel panic via duplicate CIFS context cleanup

Published Feb 26, 2025 · Updated Aug 5, 2026

Double free in Linux 5.11 through 5.15.45, 5.16 through 5.17.13, and 5.18 through 5.18.2 allows local users to panic the system. On a failed mount, cifs_smb3_do_mount falls through from out_super to out after deactivate_locked_super schedules delayed_free, so cifs_sb->ctx and its owner are cleaned up twice. Reachability requires a failing CIFS mount path; direct mounts require CAP_SYS_ADMIN, while configured DFS automounts can expose the path to lower-privileged users.

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

What happened

Double free in Linux 5.11 through 5.15.45, 5.16 through 5.17.13, and 5.18 through 5.18.2 allows local users to panic the system. On a failed mount, cifs_smb3_do_mount falls through from out_super to out after deactivate_locked_super schedules delayed_free, so cifs_sb->ctx and its owner are cleaned up twice. Reachability requires a failing CIFS mount path; direct mounts require CAP_SYS_ADMIN, while configured DFS automounts can expose the path to lower-privileged users.

The record

CVE
CVE-2022-49541
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, 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=5.11
  2. Affected versionversion=d17abdf7566566fc402c31899b353044a7ff3cf4 <8378a51e3f8140f60901fb27208cc7a6e47047b5
  3. Affected versionversion=d17abdf7566566fc402c31899b353044a7ff3cf4 <9a167fc440e5693c1cdd7f07071e05658bd9d89d
  4. Affected versionversion=d17abdf7566566fc402c31899b353044a7ff3cf4 <ce0008a0e410cdd95f0d8cd81b2902ec10a660c4
  5. Affected versionversion=d17abdf7566566fc402c31899b353044a7ff3cf4 <ee71f8f1cd3c8c4a251fd3e8abc89215ae3457cb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=d17abdf7566566fc402c31899b353044a7ff3cf4 <8378a51e3f8140f60901fb27208cc7a6e47047b5; version=d17abdf7566566fc402c31899b353044a7ff3cf4 <9a167fc440e5693c1cdd7f07071e05658bd9d89d; version=d17abdf7566566fc402c31899b353044a7ff3cf4 <ce0008a0e410cdd95f0d8cd81b2902ec10a660c4; version=d17abdf7566566fc402c31899b353044a7ff3cf4 <ee71f8f1cd3c8c4a251fd3e8abc89215ae3457cb

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 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-415Double 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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