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netfilter: nf_log: unregister loggers before per-net teardown

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: unregister loggers before per-net teardown nf_log_syslog and nfnetlink_log unregister their per-network namespace operations before unregistering their global logger backends. This leaves a window where a sysctl or netlink writer can rebind the still- registered logger after the per-net pre-exit callback cleared the old selection. The race looks like this: CPU 0 CPU 1 ---- ---- unregister_pernet_subsys() nf_log_unset(net, logger) net->nf.nf_loggers[pf] = NULL lock nf_log_mutex find logger in loggers[][] net->nf.nf_loggers[pf] = logger unlock nf_log_mutex nf_log_unregister(logger) lock nf_log_mutex loggers[pf][type] = NULL unlock nf_log_mutex synchronize_rcu() module exit returns module core frees backend memory Later, a sysctl read or packet logging operation can dereference the stale per-net logger pointer. Fix this by unregistering the global logger backends before tearing down per-net state. Once the global registrations are gone, later writers can no longer rebind the logger. unregister_pernet_subsys() already waits for an RCU grace period after the pre-exit callback clears the per-net selection, while nf_log_unregister() continues to cover readers of the global logger table. Apply this ordering fix to both nf_log backends that combine per-net teardown with global logger registration.

Announced Group revision 1
Original source ↗

CVE-2026-97608

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-2026-97608

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
        "lessThan": "51417230716b73f6aa1dc402b3a56d3382a694dc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
        "lessThan": "b0514ca1ee6f2b708d6c602ea946acdfc6a90e24",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
        "lessThan": "90166834b7dc6131aa42b6b14b8b4ed47be97079",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
        "lessThan": "eaec35fae8f2052c1878a5c7cc7699d8357d79f2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
        "lessThan": "64803ba0a05791cf9ca874466480e4c4cadaf7ab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
        "lessThan": "dce24f3a146948595bb1b86347f31e20b4975daa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
        "lessThan": "2c018cc4842c33f0c732962e2ab58635e8ae5823",
        "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": "3.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.10",
        "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": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_log_syslog.c",
      "net/netfilter/nfnetlink_log.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97608

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38047 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-97608 · Revision 1Source updated