netfilter: nf_tables: release flowtable after rcu grace period on error
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.
CVE-2026-23392
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-2026-23392
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": "3b49e2e94e6ebb8b23d0955d9e898254455734f8",
"lessThan": "d2632de96ccb066e0131ad1494241b9c281c60b8",
"versionType": "git"
},
{
"status": "affected",
"version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8",
"lessThan": "adee3436ccd29f1e514c028899e400cbc6d84065",
"versionType": "git"
},
{
"status": "affected",
"version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8",
"lessThan": "7e3955b282eae20d61c75e499c75eade51c20060",
"versionType": "git"
},
{
"status": "affected",
"version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8",
"lessThan": "c8092edb9a11f20f95ccceeb9422b7dd0df337bd",
"versionType": "git"
},
{
"status": "affected",
"version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8",
"lessThan": "e78a2dcc7cfb87b64a631441ca7681492b347ef6",
"versionType": "git"
},
{
"status": "affected",
"version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8",
"lessThan": "d73f4b53aaaea4c95f245e491aa5eeb8a21874ce",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.20",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.10",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23392
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39842 · Revision 1
- Added to Heist Feed
- Publisher date