net: udp_tunnel: prevent double queueing in udp_tunnel_nic_device_sync
In the Linux kernel, the following vulnerability has been resolved: net: udp_tunnel: prevent double queueing in udp_tunnel_nic_device_sync Yue Sun reported a use-after-free and debugobjects warning in udp_tunnel_nic_device_sync_work() during concurrent device operations. The workqueue core clears the internal pending bit before invoking the worker. At that point, a concurrent thread can queue the work again. When the already running worker eventually clears the work_pending flag to 0, it mistakenly clears the flag for the newly queued instance. udp_tunnel_nic_unregister() then observes work_pending as 0 and frees the structure while the second work item is still active in the queue, leading to UAF. Fix this by returning early in udp_tunnel_nic_device_sync() if work_pending is already set, preventing redundant work queueing.
CVE-2026-72405
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-2026-72405
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": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
"lessThan": "f49ed02fd8c98da823fdd7b00d64a8cc1d1883ac",
"versionType": "git"
},
{
"status": "affected",
"version": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
"lessThan": "cee6688e5731c0591643521716d1a1a5c1a98bf8",
"versionType": "git"
},
{
"status": "affected",
"version": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
"lessThan": "9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7",
"versionType": "git"
},
{
"status": "affected",
"version": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
"lessThan": "54292b167466cdf42176b7b6f01da66c184deb12",
"versionType": "git"
},
{
"status": "affected",
"version": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
"lessThan": "ecf69d4b43370c587e48d4d70289dbdb7e039d4d",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/udp_tunnel_nic.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/udp_tunnel_nic.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72405
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46519 · Revision 1
- Added to Heist Feed
- Publisher date