netfilter: revalidate bridge ports
In the Linux kernel, the following vulnerability has been resolved: netfilter: revalidate bridge ports ebt_redirect_tg() dereferences br_port_get_rcu() return without a NULL check, causing a kernel panic when the bridge port has been removed between the original hook invocation and an NFQUEUE reinject. A mere NULL check isn't sufficient, however. As sashiko review points out userspace can not only remove the port from the bridge, it could also place the device in a different virtual device, e.g. macvlan. If this happens, we must drop the packet, there is no way for us to reinject it into the bridge path. Switch to _upper API, we don't need the bridge port structure. Also, this fix keeps another bug intact: Both nfnetlink_log and nfnetlink_queue use CONFIG_BRIDGE_NETFILTER too aggressive, which prevents certain logging features when queueing in bridge family: NETFILTER_FAMILY_BRIDGE can be enabled while the old CONFIG_BRIDGE_NETFILTER cruft is off. Fixes tag is a common ancestor, this was always broken.
CVE-2026-53220
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-2026-53220
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": "f350a0a87374418635689471606454abc7beaa3a",
"lessThan": "98cc0403f546c52104d654fa24d86e9bcac964d3",
"versionType": "git"
},
{
"status": "affected",
"version": "f350a0a87374418635689471606454abc7beaa3a",
"lessThan": "43330a1e8aace6b5a8de9aba127e9e394ab49b0f",
"versionType": "git"
},
{
"status": "affected",
"version": "f350a0a87374418635689471606454abc7beaa3a",
"lessThan": "4beffcd726e2a731cea4dc18e1fbc55c8d76f1a0",
"versionType": "git"
},
{
"status": "affected",
"version": "f350a0a87374418635689471606454abc7beaa3a",
"lessThan": "d4b1301fd3c9e5e105fd3767c68bc4ba558bb228",
"versionType": "git"
},
{
"status": "affected",
"version": "f350a0a87374418635689471606454abc7beaa3a",
"lessThan": "ccb9fd4b87538ccf19ccff78ee26700526d94867",
"versionType": "git"
}
],
"programFiles": [
"net/bridge/netfilter/ebt_dnat.c",
"net/bridge/netfilter/ebt_redirect.c",
"net/netfilter/nfnetlink_log.c",
"net/netfilter/nfnetlink_queue.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.36"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.36",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bridge/netfilter/ebt_dnat.c",
"net/bridge/netfilter/ebt_redirect.c",
"net/netfilter/nfnetlink_log.c",
"net/netfilter/nfnetlink_queue.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53220
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46376 · Revision 1
- Added to Heist Feed
- Publisher date