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TI-2026-33889 Aliases CVE-2026-46165GHSA-gwmf-r7m2-pphm

openvswitch: vport: fix self-deadlock on release of tunnel ports

Priority LOW 24CWE-667Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-667 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: openvswitch: vport: fix self-deadlock on release of tunnel ports vports are used concurrently and protected by RCU, so netdev_put() must happen after the RCU grace period. So, either in an RCU call or after the synchronize_net(). The rtnl_delete_link() must happen under RTNL and so can't be executed in RCU context. Calling synchronize_net() while holding RTNL is not a good idea for performance and system stability under load in general, so calling netdev_put() in RCU call is the right solution here. However, when the device is deleted, rtnl_unlock() will call netdev_run_todo() and block until all the references are gone. In the current code this means that we never reach the call_rcu() and the vport is never freed and the reference is never released, causing a self-deadlock on device removal. Fix that by moving the rcu_call() before the rtnl_unlock(), so the scheduled RCU callback will be executed when synchronize_net() is called from the rtnl_unlock()->netdev_run_todo() while the RTNL itself is already released.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00099 0th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.175, 6.6.140, 6.12.88 +4Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.1.168 to before 6.1.175; 6.6.131 to before 6.6.140; 6.12.80 to before 6.12.88; 6.18.21 to before 6.18.30; 6.19.11 to before 6.206.1.175, 6.6.140, 6.12.88, 6.18.30, 6.20Patch availableCNA
LinuxLinux7.0 and later6.1.175, 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1Patch availableCNA
  • Linux VendorLinux Affected 6.1.168 to before 6.1.175; 6.6.131 to before 6.6.140; 6.12.80 to before 6.12.88; 6.18.21 to before 6.18.30; 6.19.11 to before 6.20 Fixed in 6.1.175, 6.6.140, 6.12.88, 6.18.30, 6.20 Patch available CNA
  • Linux VendorLinux Affected 7.0 and later Fixed in 6.1.175, 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.1.168 to before 6.1.175; 6.6.131 to before 6.6.140; 6.12.80 to before 6.12.88; 6.18.21 to before 6.18.30; 6.19.11 to before 7.0; 7.0.1 to before 7.0.7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:-:*:*:*:*:*:*7.0VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*7.0 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*7.0 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*7.1 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*7.1 rc2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.1.168 to before 6.1.175; 6.6.131 to before 6.6.140; 6.12.80 to before 6.12.88; 6.18.21 to before 6.18.30; 6.19.11 to before 7.0; 7.0.1 to before 7.0.7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:-:*:*:*:*:*:* Versions 7.0 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* Versions 7.0 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* Versions 7.0 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.175, 6.6.140, 6.12.88, 6.18.30, 6.20
  • Fix · CNA Linux (Linux) Fixed in 6.1.175, 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Not affected: 4 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46165
  2. 2026-10-03 Alias added: GHSA-gwmf-r7m2-pphm
  3. 2026-10-30 Fix available: Linux/Linux@3600033f31b1afa16d73a24905eec9ee1d222b97 · CNA
  4. 2026-10-30 1 new reference · CNA
  5. 2026-11-06 CISA SSVC decision points changed

References

Patch 6

Other 1

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences