CyberSecBulletin
CVE-2026-46273NVD status: Modified

Linux: Uncontrolled Resource Consumption

Published Updated By the CyberSecBulletin desk

CVE-2026-46273 is a high-severity uncontrolled resource consumption vulnerability in Linux, with a CVSS 3.1 base score of 8.6 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 86fc64584811d43c9ccd74447de58620189d8b77, 9a5e984d7af910e46dcbed3ce77873e000a4f77d, 1cdf5dbcec988d06f5f720bdf89e91073f77fa10 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 0.39% 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 86fc64584811d43c9ccd74447de58620189d8b77 or 9a5e984d7af910e46dcbed3ce77873e000a4f77d or 1cdf5dbcec988d06f5f720bdf89e91073f77fa10 or 82bc89fbb82d9396fb4eaee8720ea85e2e787957, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.258 or 5.15.209 or 6.1.175 or 6.6.140, 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
LinuxLinux8641dd85799f85bef5f0d1f87356aaa12cb2195e up to, but not including, 86fc64584811d43c9ccd74447de58620189d8b77; 8641dd85799f85bef5f0d1f87356aaa12cb2195e up to, but not including, 9a5e984d7af910e46dcbed3ce77873e000a4f77d; 8641dd85799f85bef5f0d1f87356aaa12cb2195e up to, but not including, 1cdf5dbcec988d06f5f720bdf89e91073f77fa10; 8641dd85799f85bef5f0d1f87356aaa12cb2195e up to, but not including, 82bc89fbb82d9396fb4eaee8720ea85e2e787957; 8641dd85799f85bef5f0d1f87356aaa12cb2195e up to, but not including, db8012c631cb845e9ae2b4b531e17d86c9519755; 8641dd85799f85bef5f0d1f87356aaa12cb2195e up to, but not including, c1f261863e65b508f37416dfbc5c5d911c9b9233; 8641dd85799f85bef5f0d1f87356aaa12cb2195e up to, but not including, 3af24f0c4c31f18a4a2d927990759194832bb6e9; 8641dd85799f85bef5f0d1f87356aaa12cb2195e up to, but not including, cc427d24ac6442ffdeafd157a63c7c5b73ed4de4; and 1 more ranges86fc64584811d43c9ccd74447de58620189d8b77, 9a5e984d7af910e46dcbed3ce77873e000a4f77d, 1cdf5dbcec988d06f5f720bdf89e91073f77fa10, 82bc89fbb82d9396fb4eaee8720ea85e2e787957, db8012c631cb845e9ae2b4b531e17d86c9519755, c1f261863e65b508f37416dfbc5c5d911c9b9233
LinuxLinux Kernel4.2 up to, but not including, 5.10.258; 5.11 up to, but not including, 5.15.209; 5.16 up to, but not including, 6.1.175; 6.2 up to, but not including, 6.6.140; 6.7 up to, but not including, 6.12.88; 6.13 up to, but not including, 6.18.30; 6.19 up to, but not including, 7.0.7; 7.15.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, 6.18.30

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
ChangedThe attack can reach beyond the vulnerable component into other systems.
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:C/C:N/I:N/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: ibmveth: Disable GSO for packets with small MSS Some physical adapters on Power systems do not support segmentation offload when the MSS is less than 224 bytes. Attempting to send such packets causes the adapter to freeze, stopping all traffic until manually reset. Implement ndo_features_check to disable GSO for packets with small MSS values. The network stack will perform software segmentation instead. The 224-byte minimum matches ibmvnic commit <f10b09ef687f> ("ibmvnic: Enforce stronger sanity checks on GSO packets") which uses the same physical adapters in SEA configurations. The issue occurs specifically when the hardware attempts to perform segmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets (gso_segs == 1) do not trigger the problematic LSO code path and are transmitted normally without segmentation. Add an ndo_features_check callback to disable GSO when MSS < 224 bytes. Also call vlan_features_check() to ensure proper handling of VLAN packets, particularly QinQ (802.1ad) configurations where the hardware parser may not support certain offload features. Validated using iptables to force small MSS values. Without the fix, the adapter freezes. With the fix, packets are segmented in software and transmission succeeds. Comprehensive regression testing completedd (MSS tests, performance, stability).

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

Spotted an error? Tell us.