netfilter: nf_conntrack: defer invalid log until after unlock
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: defer invalid log until after unlock TCP and SCTP conntrack paths can emit invalid-packet logs while ct->lock is still held. When invalid logging is routed to nfnetlink_log and conntrack export is enabled, the log path can re-enter conntrack netlink glue and dump the same conntrack again. Protocol attribute dumping may take ct->lock, so logging while holding that lock can deadlock. Defer the TCP invalid logs by storing only the minimal log context while ct->lock is held and emitting the log after unlocking. Also make the TCP timeout-lowering invalid path return whether a log is needed, then emit that log after unlocking. Do the same for the SCTP invalid state-transition log that can be reached while ct->lock is held. Add a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers that log invalid conntracks while holding ct->lock are caught outside TCP and SCTP as well.
CVE-2026-74624
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-2026-74624
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": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
"lessThan": "ca97360eba4b3dc67f1804625542f4ccc774242a",
"versionType": "git"
},
{
"status": "affected",
"version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
"lessThan": "63853eb20bba4e00b7cd0b8cfc19337bbaaf5037",
"versionType": "git"
},
{
"status": "affected",
"version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
"lessThan": "9480fcf70a5aa9d320088a01c95df0e5e6391f4a",
"versionType": "git"
},
{
"status": "affected",
"version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
"lessThan": "0424186d570aa4d1ad17f516afb86bd9eaa4f42e",
"versionType": "git"
},
{
"status": "affected",
"version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
"lessThan": "c0224327b7cbed9d3198e8dbec847281053dcd06",
"versionType": "git"
},
{
"status": "affected",
"version": "d9a6f0d0df1899ff9086a57abc600e414f4b8cdd",
"lessThan": "2d19b95c9723001f214f7a47d67b09f46238f200",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_proto.c",
"net/netfilter/nf_conntrack_proto_sctp.c",
"net/netfilter/nf_conntrack_proto_tcp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_conntrack_proto.c",
"net/netfilter/nf_conntrack_proto_sctp.c",
"net/netfilter/nf_conntrack_proto_tcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74624
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34246 · Revision 1
- Added to Heist Feed
- Publisher date