CyberSecBulletin
CVE-2026-53183NVD status: Modified

Linux: Uncontrolled Resource Consumption

Published Updated By the CyberSecBulletin desk

CVE-2026-53183 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 bf364b0f10b27679140699821f88af7f01e2a6e3, b1fd13074f22105deec45aa02283e322733e0c2d, aa3861f40ac32706d9e97bfac76984613e278788 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 0.49% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to bf364b0f10b27679140699821f88af7f01e2a6e3 or b1fd13074f22105deec45aa02283e322733e0c2d or aa3861f40ac32706d9e97bfac76984613e278788 or 653245266913f03fcf21cbca68eed5c197a33e52, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.1.176 or 6.6.143 or 6.12.94 or 6.18.36, 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
LinuxLinuxf3589be0c420a3137e5902d15705ced6a36f3f43 up to, but not including, bf364b0f10b27679140699821f88af7f01e2a6e3; f3589be0c420a3137e5902d15705ced6a36f3f43 up to, but not including, b1fd13074f22105deec45aa02283e322733e0c2d; f3589be0c420a3137e5902d15705ced6a36f3f43 up to, but not including, aa3861f40ac32706d9e97bfac76984613e278788; f3589be0c420a3137e5902d15705ced6a36f3f43 up to, but not including, 653245266913f03fcf21cbca68eed5c197a33e52; f3589be0c420a3137e5902d15705ced6a36f3f43 up to, but not including, c297a4e65c50a2b807d9309b22615080faffa8f3; f3589be0c420a3137e5902d15705ced6a36f3f43 up to, but not including, da23be77e1292cd611e736c3aa17da633d7ddce7; 5.19bf364b0f10b27679140699821f88af7f01e2a6e3, b1fd13074f22105deec45aa02283e322733e0c2d, aa3861f40ac32706d9e97bfac76984613e278788, 653245266913f03fcf21cbca68eed5c197a33e52, c297a4e65c50a2b807d9309b22615080faffa8f3, da23be77e1292cd611e736c3aa17da633d7ddce7
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystemall versionsNot stated
LinuxLinux Kernel5.19 up to, but not including, 6.1.176; 6.2 up to, but not including, 6.6.143; 6.7 up to, but not including, 6.12.94; 6.13 up to, but not including, 6.18.36; 6.19 up to, but not including, 7.0.13; 7.16.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13

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 CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: mptcp: allow subflow rcv wnd to shrink In MPTCP connection, the `window` field in the TCP header refers to the MPTCP-level rcv_nxt and it's right edge should not move backward. Such constraint is enforced at DSS option generation time. At the same time, the TCP stack ensures independently that the TCP-level rcv wnd right's edge does not move backward. That in turn causes artificial inflating of the MPTCP rcv window when the incoming data is acked at the TCP level and is OoO in the MPTCP sequence space (or lands in the backlog). As a consequence, the incoming traffic can exceed the receiver rcvbuf size even when the sender is not misbehaving. Prevent such scenario forcibly allowing the TCP subflow to shrink the TCP-level rcv wnd regardless of the current netns setting.

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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