VulnerabilityPublished 15 Aug 2026Updated 30 Oct 2026

CVE-2026-74543: Linux kernel · net: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()

Source GCVE Database

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Authoritative record:CVE-2026-74543· Medium

Not known to be exploited · fixed in f82a2ded3d7a9098267c84f14eafdb98c4550ac5 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 19:33 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in f82a2ded3d7a9098267c84f14eafdb98c4550ac5, d53a8b927ac9788257266e115d4901ec6f455387, b322532a4b774db1b480a2de84125910a70739a5 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-6fp2-p6pg-3j24

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < f82a2ded3d7a9098267c84f14eafdb98c4550ac5	Fixed in f82a2ded3d7a9098267c84f14eafdb98c4550ac5
LinuxLinux	Affected ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < d53a8b927ac9788257266e115d4901ec6f455387	Fixed in d53a8b927ac9788257266e115d4901ec6f455387
LinuxLinux	Affected ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < b322532a4b774db1b480a2de84125910a70739a5	Fixed in b322532a4b774db1b480a2de84125910a70739a5
LinuxLinux	Affected ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < b712da45bd9b9835d132e9fbc0c3e43c164cb1fd	Fixed in b712da45bd9b9835d132e9fbc0c3e43c164cb1fd
LinuxLinux	Affected ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < 080695e6f005e2396f1207fd69d24c442cb230c6	Fixed in 080695e6f005e2396f1207fd69d24c442cb230c6
LinuxLinux	Affected ≥ cc4e3835eff474aa274d6e1d18f69d9d296d3b76, < 52c753b46265243406690d980faa9514d3f53827	Fixed in 52c753b46265243406690d980faa9514d3f53827

AI-suggested

A fix for this memory leak vulnerability has been implemented in the Linux kernel source code. Users should apply the official kernel updates that include this fix. Since this is a kernel-level issue, upgrading to a patched kernel version is the recommended remediation. No additional mitigations are indicated.

Description

A memory leak vulnerability in the Linux kernel's UDP tunnel NIC offload code was fixed. The issue occurred when device registration failed, causing the udp_tunnel_nic_unregister() function to return early and leak allocated memory. The fix involves removing the early return and properly canceling any pending work before freeing resources.

References

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