7.8

CVE-2026-72405: net: udp_tunnel: prevent double queueing in udp_tunnel_nic_device_sync

Received
AliasesUBUNTU-CVE-2026-72405DEBIAN-CVE-2026-72405
Published 15-08-2026Last modified 30-10-2026

Vulnerability summary

CVE-2026-72405 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · -0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 14
OPENSUSE-SU-2026:22167-1SUSE-SU-2026:24386-1SUSE-SU-2026:24422-1SUSE-SU-2026:24437-1SUSE-SU-2026:24446-1USN-8886-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 30-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Decrease -0.03 pp

From 0.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.100-1 | < 7.1.5-1
Linux1 product
  • linux≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < d59d3b19e1cd1a01a6db59705327387a30aed153 | ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < f49ed02fd8c98da823fdd7b00d64a8cc1d1883ac | ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < cee6688e5731c0591643521716d1a1a5c1a98bf8 | ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < 9075efb9b2c1d9d7a8285c937b64aa93ca0c41b7 | ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < 54292b167466cdf42176b7b6f01da66c184deb12 | ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < ecf69d4b43370c587e48d4d70289dbdb7e039d4d | 5.9

3 vendors · 159 products

References

19 links
Show all 19 references