CyberSecBulletin
CVE-2022-48748NVD status: Analyzed

Linux: Uncontrolled Resource Consumption

Published Updated By the CyberSecBulletin desk

CVE-2022-48748 is a high-severity uncontrolled resource consumption vulnerability in Linux, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 446ff1fc37c74093e81db40811a07b5a19f1d797, c5e216e880fa6f2cd9d4a6541269377657163098, 14be8d448fca6fe7b2a413831eedd55aef6c6511 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.13% chance of exploitation within 30 days, higher than 67% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 446ff1fc37c74093e81db40811a07b5a19f1d797 or c5e216e880fa6f2cd9d4a6541269377657163098 or 14be8d448fca6fe7b2a413831eedd55aef6c6511 or fd20d9738395cf8e27d0a17eba34169699fccdff, whichever matches your release line, or a later version.
  2. Update linux_kernel to 446ff1fc37c7 or c5e216e880fa or 14be8d448fca or fd20d9738395, whichever matches your release line, or a later version.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxa580c76d534c7360ba68042b19cb255e8420e987 up to, but not including, 446ff1fc37c74093e81db40811a07b5a19f1d797; a580c76d534c7360ba68042b19cb255e8420e987 up to, but not including, c5e216e880fa6f2cd9d4a6541269377657163098; a580c76d534c7360ba68042b19cb255e8420e987 up to, but not including, 14be8d448fca6fe7b2a413831eedd55aef6c6511; a580c76d534c7360ba68042b19cb255e8420e987 up to, but not including, fd20d9738395cf8e27d0a17eba34169699fccdff; 5.6446ff1fc37c74093e81db40811a07b5a19f1d797, c5e216e880fa6f2cd9d4a6541269377657163098, 14be8d448fca6fe7b2a413831eedd55aef6c6511, fd20d9738395cf8e27d0a17eba34169699fccdff
Linuxlinux_kernela580c76d534c up to, but not including, 446ff1fc37c7; a580c76d534c up to, but not including, c5e216e880fa; a580c76d534c up to, but not including, 14be8d448fca; a580c76d534c up to, but not including, fd20d9738395; 5.6446ff1fc37c7, c5e216e880fa, 14be8d448fca, fd20d9738395

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CISA (ADP).

Official description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: vlan: fix memory leak in __allowed_ingress When using per-vlan state, if vlan snooping and stats are disabled, untagged or priority-tagged ingress frame will go to check pvid state. If the port state is forwarding and the pvid state is not learning/forwarding, untagged or priority-tagged frame will be dropped but skb memory is not freed. Should free skb when __allowed_ingress returns false.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource.

How developers prevent this class of flaw

  • Ensure that protocols have specific limits of scale placed on them.
  • Ensure that all failures in resource allocation place the system into a safe posture.

More Uncontrolled Resource Consumption vulnerabilities (CWE-400)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Uncontrolled Resource Consumption vulnerabilities

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