openvswitch: vport: fix self-deadlock on release of tunnel ports (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.10 % · percentile 1 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
Description
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.
Weaknesses (CWE)
- CWE-667 — Improper Locking
References
- https://git.kernel.org/stable/c/3600033f31b1afa16d73a24905eec9ee1d222b97
- https://git.kernel.org/stable/c/8ae6c15fc473c9ad03b0173330cce9a092c76154
- https://git.kernel.org/stable/c/c741433f6c8dcdecd1d9549d89053761fd1ea413
- https://git.kernel.org/stable/c/6522d59fb7de55ce0f0f285d962243ddffebb01f
- https://git.kernel.org/stable/c/3df75fff46b1517eb479d8e6b8e3500763715dd0
- https://git.kernel.org/stable/c/366c482965c673565ecb8bcfb15d5548f13a6a10
- https://git.kernel.org/stable/c/aa69918bd418e700309fdd08509dba324fb24296
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2026-32792
- GCVE · GCVE-0-2026-46165
CERT-FR advisories
- CERTFR-2026-AVI-1298 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1252 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1229 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1162 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1066 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1064 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1029 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0954 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0927 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0926 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0862 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0731 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.1.168 < 6.1.175cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.6.131 < 6.6.140cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.12.80 < 6.12.88cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.18.21 < 6.18.30cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19.11 < 7.0cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 7.0.1 < 7.0.7cpe:2.3:o:linux:linux_kernel:7.0:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected f0ec49d3a39c1f5a4f3270ea27ca0854fad2a2a2 < 3600033f31b1afa16d73a24905eec9ee1d222b97 ; affected 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc < 8ae6c15fc473c9ad03b0173330cce9a092c76154 ; affected 42f0d3d81209654c08ffdde5a34b9b92d2645896 < c741433f6c8dcdecd1d9549d89053761fd1ea413 ; affected bbe7bd722bfaea36aab3da6cc60fb4a05c644643 < 6522d59fb7de55ce0f0f285d962243ddffebb01f ; affected 98b726ab5e2a4811e27c28e4d041f75bba147eab < 3df75fff46b1517eb479d8e6b8e3500763715dd0 ; affected 6931d21f87bc6d657f145798fad0bf077b82486c < 366c482965c673565ecb8bcfb15d5548f13a6a10 |
| Linux · Linux | affected 7.0 ; unaffected 0 < 7.0 ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.140 ≤ 6.6.* ; unaffected 6.12.88 ≤ 6.12.* ; unaffected 6.18.30 ≤ 6.18.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |