netfilter: flowtable: strictly check for maximum number of actions
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.
CVE-2026-43329
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43329
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
"lessThan": "ead66c77303f760f6c30be96e2e20d5a77cef614",
"versionType": "git"
},
{
"status": "affected",
"version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
"lessThan": "fe9018d3e94329f1951b00805a8640bc06f56ead",
"versionType": "git"
},
{
"status": "affected",
"version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
"lessThan": "5382bb03e9c33b089d60788478b922a2dca284cc",
"versionType": "git"
},
{
"status": "affected",
"version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
"lessThan": "57c78bd2e2dd08897acd35b2bf8bcef322e36f5e",
"versionType": "git"
},
{
"status": "affected",
"version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
"lessThan": "504c9456699dcf4d15195ef34a0fa94a80bfc877",
"versionType": "git"
},
{
"status": "affected",
"version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
"lessThan": "879959a7a2be814dd57568655eafa3d8f4d0309e",
"versionType": "git"
},
{
"status": "affected",
"version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
"lessThan": "76522fcdbc3a02b568f5d957f7e66fc194abb893",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_flow_table_offload.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_flow_table_offload.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43329
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40057 · Revision 1
- Added to Heist Feed
- Publisher date