openvswitch: defer tunnel netdev_put to RCU release
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.
CVE-2026-31678
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31678
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a9020fde67a6eb77f8130feff633189f99264db1",
"lessThan": "9d56aced21fb9c104e8a3f3be9b21fbafe448ffc",
"versionType": "git"
},
{
"status": "affected",
"version": "a9020fde67a6eb77f8130feff633189f99264db1",
"lessThan": "42f0d3d81209654c08ffdde5a34b9b92d2645896",
"versionType": "git"
},
{
"status": "affected",
"version": "a9020fde67a6eb77f8130feff633189f99264db1",
"lessThan": "bbe7bd722bfaea36aab3da6cc60fb4a05c644643",
"versionType": "git"
},
{
"status": "affected",
"version": "a9020fde67a6eb77f8130feff633189f99264db1",
"lessThan": "98b726ab5e2a4811e27c28e4d041f75bba147eab",
"versionType": "git"
},
{
"status": "affected",
"version": "a9020fde67a6eb77f8130feff633189f99264db1",
"lessThan": "b8c56a3fc5d879c0928f207a756b0f067f06c6a8",
"versionType": "git"
},
{
"status": "affected",
"version": "a9020fde67a6eb77f8130feff633189f99264db1",
"lessThan": "6931d21f87bc6d657f145798fad0bf077b82486c",
"versionType": "git"
}
],
"programFiles": [
"net/openvswitch/vport-netdev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/openvswitch/vport-netdev.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31678
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39952 · Revision 1
- Added to Heist Feed
- Publisher date