CVE-2026-31678: linux
Vulnerability summary
CVE-2026-31678 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 33 · Related 29Timeline
- 25-04-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.10%
Chance of exploitation in the next 30 days
Percentile
1%
Versus all other CVEs
30-day change
+0.01 pp
From 0.10% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionThe product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
- CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
Affected systems
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 6.8.0-136.136
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1061.64
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ a9020fde67a6eb77f8130feff633189f99264db1, < 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc | ≥ a9020fde67a6eb77f8130feff633189f99264db1, < 42f0d3d81209654c08ffdde5a34b9b92d2645896 | ≥ a9020fde67a6eb77f8130feff633189f99264db1, < bbe7bd722bfaea36aab3da6cc60fb4a05c644643 | ≥ a9020fde67a6eb77f8130feff633189f99264db1, < 98b726ab5e2a4811e27c28e4d041f75bba147eab | ≥ a9020fde67a6eb77f8130feff633189f99264db1, < b8c56a3fc5d879c0928f207a756b0f067f06c6a8 | ≥ a9020fde67a6eb77f8130feff633189f99264db1, < 6931d21f87bc6d657f145798fad0bf077b82486c | 4.3
- linux_kernel≥ 4.3, < 6.1.168 | ≥ 6.2, < 6.6.131 | ≥ 6.7, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5
Debian1 product
- linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.11-1
3 vendors · 160 products
