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CVE-2026-98320

Linux: netfilter: flowtable: hold reference on ct until flow is released

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.14%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in93ff1594be1aad4da364462dd8db050ebcfda2deAlso 61c6688be282277c6e91ab286a7acd0ae8681ac6, 8274cdc5f9c57e17ed77fc4ba76212536c840f25 and 1 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 93ff1594be1aad4da364462dd8db050ebcfda2deLinuxCVE List
  • 61c6688be282277c6e91ab286a7acd0ae8681ac6LinuxCVE List
  • 8274cdc5f9c57e17ed77fc4ba76212536c840f25LinuxCVE List
  • 12c1ac230f4ca16e0017b62a963ab75e0b48074fLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: flowtable: hold reference on ct until flow is released

nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period.

Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away.

Text from CVE List

Affected versions 18

  • Linuxaffected: 0ff90b6c20340e57616a51ae1a1bf18156d6638a before 93ff1594be1aad4da364462dd8db050ebcfda2deCVE List
  • Linuxaffected: 0ff90b6c20340e57616a51ae1a1bf18156d6638a before eed6997e8dc40593a539fcc722e7ed51b18db86cCVE List
  • Linuxaffected: 0ff90b6c20340e57616a51ae1a1bf18156d6638a before 61c6688be282277c6e91ab286a7acd0ae8681ac6CVE List
  • Linuxaffected: 0ff90b6c20340e57616a51ae1a1bf18156d6638a before a43cd2b67b91e943273c913237a7a88c50cdcfbcCVE List
  • Linuxaffected: 0ff90b6c20340e57616a51ae1a1bf18156d6638a before 8274cdc5f9c57e17ed77fc4ba76212536c840f25CVE List
  • Linuxaffected: 0ff90b6c20340e57616a51ae1a1bf18156d6638a before 12c1ac230f4ca16e0017b62a963ab75e0b48074fCVE List
  • Linuxaffected: 0ff90b6c20340e57616a51ae1a1bf18156d6638a before d9e6175a3ee48209ee65f294fc567b4e16b29b74CVE List
  • Linuxaffected: 0ff90b6c20340e57616a51ae1a1bf18156d6638a before e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0dCVE List
  • Linuxaffected: 4.16CVE List
  • Linuxunaffected: all versions before 4.16CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8