netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state sashiko reports: "nfnl_log_net_exit() calls nf_log_unset(), which clears the logger pointer without an RCU grace period. Immediately after, ops_free_list() frees the per-net state while concurrent packets might still be executing nf_log_packet() under rcu_read_lock()." Clear the pointer via .pre_exit to make sure rcu readers have completed before pernet storage is free'd. The change in nf_log_syslog.c is only done for consistency: it doesn't use pernet data.
CVE-2026-93288
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-2026-93288
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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
"lessThan": "ba2e246aa294f9acd86194ea87fb6834ed0a37ac",
"versionType": "git"
},
{
"status": "affected",
"version": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
"lessThan": "5570d6c8b320dbcc602617ee08c27ce752fed65a",
"versionType": "git"
},
{
"status": "affected",
"version": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
"lessThan": "3b9aa62d78ce80de47af2db472ff452398755213",
"versionType": "git"
},
{
"status": "affected",
"version": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
"lessThan": "f4461654374576e9d5d0245fd534c46ad8509051",
"versionType": "git"
},
{
"status": "affected",
"version": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
"lessThan": "dc20050b6b12ca58066715d088e1a537535d938d",
"versionType": "git"
},
{
"status": "affected",
"version": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
"lessThan": "33d1469b0124cc0baaea7a2032123b77a81e0940",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_log_syslog.c",
"net/netfilter/nfnetlink_log.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_log_syslog.c",
"net/netfilter/nfnetlink_log.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93288
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #8259 · Revision 1
- Added to Heist Feed
- Publisher date