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CVE-2026-98604

Linux: ovpn: replace bind when learning local endpoint

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in21dbc9f4d0bdd3b22f91beabc7840064bf11594fFixed versionCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 21dbc9f4d0bdd3b22f91beabc7840064bf11594fLinuxCVE 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:

ovpn: replace bind when learning local endpoint

struct ovpn_bind is published through peer->bind with RCU, but local endpoint learning updates bind->local in place under peer->lock. UDP TX reads the field without that lock. In particular, a concurrent IPv6 update can therefore result in a torn address read.

Use ovpn_peer_reset_sockaddr to publish a replacement bind when learning a new local endpoint, just as a remote endpoint change does. Preserve the current remote address and reset the dst cache only after the new bind has been published successfully.

Track remote endpoint changes separately so that float notification and transport-address rehashing remain limited to actual peer floats.

Text from CVE List

Affected versions 8

  • Linuxaffected: f0281c1d3732d1ec084fa1e06d1767d33e1a570e before 21dbc9f4d0bdd3b22f91beabc7840064bf11594fCVE List
  • Linuxaffected: f0281c1d3732d1ec084fa1e06d1767d33e1a570e before e283009151d3d131447c2edda500199c5fda5f72CVE List
  • Linuxaffected: f0281c1d3732d1ec084fa1e06d1767d33e1a570e before aea934a221ec6a867221e5b765f65f1857befd53CVE List
  • Linuxaffected: 6.16CVE List
  • Linuxunaffected: all versions before 6.16CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 3