CVE-2022-48919

Kernel crash via CIFS mount double-free

Published Aug 22, 2024 · Updated Aug 5, 2026

Double-free in the CIFS mount path in affected Linux branches allows local users to crash the kernel through a failed SMB3 mount. When cifs_get_root() fails, cifs_smb3_do_mount() calls deactivate_locked_super(), whose delayed_free() releases the context, then falls through to out and frees the resources again. Reaching the flaw requires local mount privileges and a mount failure after CIFS session and tree setup; the resulting use-after-free can interrupt the system.

CVSS severity7.8
High
EPSS probability0.47%
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 the CIFS mount path in affected Linux branches allows local users to crash the kernel through a failed SMB3 mount. When cifs_get_root() fails, cifs_smb3_do_mount() calls deactivate_locked_super(), whose delayed_free() releases the context, then falls through to out and frees the resources again. Reaching the flaw requires local mount privileges and a mount failure after CIFS session and tree setup; the resulting use-after-free can interrupt the system.

The record

CVE
CVE-2022-48919
Published
Aug 22, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2024CVE 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 <3d6cc9898efdfb062efb74dc18cfc700e082f5d5
  3. Affected versionversion=d17abdf7566566fc402c31899b353044a7ff3cf4 <546d60859ecf13380fcabcbeace53a5971493a2b
  4. Affected versionversion=d17abdf7566566fc402c31899b353044a7ff3cf4 <563431c1f3c8f2230e4a9c445fa23758742bc4f0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=d17abdf7566566fc402c31899b353044a7ff3cf4 <3d6cc9898efdfb062efb74dc18cfc700e082f5d5; version=d17abdf7566566fc402c31899b353044a7ff3cf4 <546d60859ecf13380fcabcbeace53a5971493a2b; version=d17abdf7566566fc402c31899b353044a7ff3cf4 <563431c1f3c8f2230e4a9c445fa23758742bc4f0

Published CVSS scores

7.8NISTCVSS: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-415Double Free
T1499.004Application or System Exploitation

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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