CVE-2026-43329

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Source
https://cve.org/CVERecord?id=CVE-2026-43329
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43329.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-43329
Downstream
Related
Published
2026-05-08T13:31:17.479Z
Modified
2026-06-03T08:44:09.850885404Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
netfilter: flowtable: strictly check for maximum number of actions
Details

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 flowactionentry_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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43329.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
c29f74e0df7a02b8303bcdce93a7c0132d62577a
Fixed
ead66c77303f760f6c30be96e2e20d5a77cef614
Fixed
fe9018d3e94329f1951b00805a8640bc06f56ead
Fixed
5382bb03e9c33b089d60788478b922a2dca284cc
Fixed
57c78bd2e2dd08897acd35b2bf8bcef322e36f5e
Fixed
504c9456699dcf4d15195ef34a0fa94a80bfc877
Fixed
879959a7a2be814dd57568655eafa3d8f4d0309e
Fixed
76522fcdbc3a02b568f5d957f7e66fc194abb893

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43329.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.5.0
Fixed
5.15.203
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.168
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.134
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.81
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.22
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
6.19.12

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43329.json"