CVE-2022-48748Network attack vector

Service interruption via dropped-frame memory leak

Published Jun 20, 2024 · Updated May 11, 2026

Resource exhaustion in the Linux bridge VLAN ingress path allows remote attackers to interrupt service with crafted Ethernet frames. When __allowed_ingress rejects an untagged or priority-tagged frame after checking the PVID state, it returns false without freeing the associated skb. The reachable state requires per-VLAN state, disabled VLAN snooping and statistics, a forwarding port, and a PVID that is neither learning nor forwarding; repeated drops consume kernel memory.

CVSS severity7.5
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Resource exhaustion in the Linux bridge VLAN ingress path allows remote attackers to interrupt service with crafted Ethernet frames. When __allowed_ingress rejects an untagged or priority-tagged frame after checking the PVID state, it returns false without freeing the associated skb. The reachable state requires per-VLAN state, disabled VLAN snooping and statistics, a forwarding port, and a PVID that is neither learning nor forwarding; repeated drops consume kernel memory.

The record

CVE
CVE-2022-48748
Published
Jun 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 20, 2024CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.6
  2. Affected versionversion=a580c76d534c7360ba68042b19cb255e8420e987 <14be8d448fca6fe7b2a413831eedd55aef6c6511
  3. Affected versionversion=a580c76d534c7360ba68042b19cb255e8420e987 <446ff1fc37c74093e81db40811a07b5a19f1d797
  4. Affected versionversion=a580c76d534c7360ba68042b19cb255e8420e987 <c5e216e880fa6f2cd9d4a6541269377657163098
  5. Affected versionversion=a580c76d534c7360ba68042b19cb255e8420e987 <fd20d9738395cf8e27d0a17eba34169699fccdff

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=a580c76d534c7360ba68042b19cb255e8420e987 <14be8d448fca6fe7b2a413831eedd55aef6c6511; version=a580c76d534c7360ba68042b19cb255e8420e987 <446ff1fc37c74093e81db40811a07b5a19f1d797; version=a580c76d534c7360ba68042b19cb255e8420e987 <c5e216e880fa6f2cd9d4a6541269377657163098; version=a580c76d534c7360ba68042b19cb255e8420e987 <fd20d9738395cf8e27d0a17eba34169699fccdff
The Linux Kernel Organization · Linux Kernelversion=5.6; version=a580c76d534c <14be8d448fca; version=a580c76d534c <446ff1fc37c7; version=a580c76d534c <c5e216e880fa; version=a580c76d534c <fd20d9738395

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo