CVE-2026-31678
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: defer tunnel netdev_put to RCU release
ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detached the device. Dropping the netdev reference in destroy can race with concurrent readers that still observe vport->dev.
Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let vport_netdev_free() drop the reference from the RCU callback, matching the non-tunnel destroy path and avoiding additional synchronization under RTNL.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | a9020fde67a6eb77f8130feff633189f99264db1 < 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc | affected |
| Linux | Linux | a9020fde67a6eb77f8130feff633189f99264db1 < 42f0d3d81209654c08ffdde5a34b9b92d2645896 | affected |
| Linux | Linux | a9020fde67a6eb77f8130feff633189f99264db1 < bbe7bd722bfaea36aab3da6cc60fb4a05c644643 | affected |
| Linux | Linux | a9020fde67a6eb77f8130feff633189f99264db1 < 98b726ab5e2a4811e27c28e4d041f75bba147eab | affected |
| Linux | Linux | a9020fde67a6eb77f8130feff633189f99264db1 < b8c56a3fc5d879c0928f207a756b0f067f06c6a8 | affected |
| Linux | Linux | a9020fde67a6eb77f8130feff633189f99264db1 < 6931d21f87bc6d657f145798fad0bf077b82486c | affected |
| Linux | Linux | 4.3 | affected |
| Linux | Linux | 0 < 4.3 | unaffected |
| Linux | Linux | 6.1.168 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.131 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.80 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.21 <= 6.18.* | unaffected |
| Linux | Linux | 6.19.11 <= 6.19.* | unaffected |
| Linux | Linux | 7.0 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/9d56aced21fb9c104e8a3f3be9b21fbafe448ffc
- https://git.kernel.org/stable/c/42f0d3d81209654c08ffdde5a34b9b92d2645896
- https://git.kernel.org/stable/c/bbe7bd722bfaea36aab3da6cc60fb4a05c644643
- https://git.kernel.org/stable/c/98b726ab5e2a4811e27c28e4d041f75bba147eab
- https://git.kernel.org/stable/c/b8c56a3fc5d879c0928f207a756b0f067f06c6a8
- https://git.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486c
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