CVE-2022-49582

Local service interruption via overwritten DSA port pointer

Published Feb 26, 2025 · Updated May 11, 2026

NULL pointer dereference in Linux 5.16 through 5.18.14 allows local users to interrupt service by leaving a VLAN-aware bridge. A reused ds iterator overwrites the dp argument in dsa_port_reset_vlan_filtering(), which then passes an invalid port pointer to dsa_port_vlan_filtering(). Reachability requires a DSA switch with vlan_filtering_is_global=true to leave a VLAN-aware bridge; the resulting kernel fault interrupts networking and system availability.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux 5.16 through 5.18.14 allows local users to interrupt service by leaving a VLAN-aware bridge. A reused ds iterator overwrites the dp argument in dsa_port_reset_vlan_filtering(), which then passes an invalid port pointer to dsa_port_vlan_filtering(). Reachability requires a DSA switch with vlan_filtering_is_global=true to leave a VLAN-aware bridge; the resulting kernel fault interrupts networking and system availability.

The record

CVE
CVE-2022-49582
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.16
  2. Affected versionversion=d0004a020bb50263de0e3e775c7b7c7a003e0e0c <1699b4d502eda3c7ea4070debad3ee570b5091b1
  3. Affected versionversion=d0004a020bb50263de0e3e775c7b7c7a003e0e0c <3240e12fe203a3a79b9814e83327106b770ed7b0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=d0004a020bb50263de0e3e775c7b7c7a003e0e0c <1699b4d502eda3c7ea4070debad3ee570b5091b1; version=d0004a020bb50263de0e3e775c7b7c7a003e0e0c <3240e12fe203a3a79b9814e83327106b770ed7b0

Published CVSS scores

5.5CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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