CVE-2026-43329

Advisory lineage Upstream: 0 Downstream: 21
Analyzed
Published: 08 May 2026, 13:31
Last modified:22 Jul 2026, 12:08

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.14% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

08 May 2026, 13:31
Published
Vulnerability first disclosed
22 Jul 2026, 12:08
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: strictly check for maximum number of actions The maximum number of flowtable hardware offload actions in IPv6 is: * ethernet mangling (4 payload actions, 2 for each ethernet address) * SNAT (4 payload actions) * DNAT (4 payload actions) * Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing) for QinQ. * Redirect (1 action) Which makes 17, while the maximum is 16. But act_ct supports for tunnels actions too. Note that payload action operates at 32-bit word level, so mangling an IPv6 address takes 4 payload actions. Update flow_action_entry_next() calls to check for the maximum number of supported actions. While at it, rise the maximum number of actions per flow from 16 to 24 so this works fine with IPv6 setups.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.14%• Percentile: 4%

Techniques & Countermeasures

  • CWE-770•Allocation of Resources Without Limits or Throttling

    The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

  • linux•linux

    ≥ c29f74e0df7a02b8303bcdce93a7c0132d62577a, < ead66c77303f760f6c30be96e2e20d5a77cef614 | ≥ c29f74e0df7a02b8303bcdce93a7c0132d62577a, < fe9018d3e94329f1951b00805a8640bc06f56ead | ≥ c29f74e0df7a02b8303bcdce93a7c0132d62577a, < 5382bb03e9c33b089d60788478b922a2dca284cc | ≥ c29f74e0df7a02b8303bcdce93a7c0132d62577a, < 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e | ≥ c29f74e0df7a02b8303bcdce93a7c0132d62577a, < 504c9456699dcf4d15195ef34a0fa94a80bfc877 | ≥ c29f74e0df7a02b8303bcdce93a7c0132d62577a, < 879959a7a2be814dd57568655eafa3d8f4d0309e | ≥ c29f74e0df7a02b8303bcdce93a7c0132d62577a, < 76522fcdbc3a02b568f5d957f7e66fc194abb893 | 5.5

  • linux•linux kernel

    ≥ 5.5, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6

References (23)