Critical severity · published Aug 22, 2026
CVE-2026-74705
udp: fix potential use-after-free in tunnel segmentation
10.0
CVSS
0.5%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
udp: fix potential use-after-free in tunnel segmentation
__skb_udp_tunnel_segment() gets the UDP header before ensuring the
tunnel header is in the skb head. If the pull reallocates skb->head,
the saved UDP header pointer is no longer valid.
Get the UDP header after the pull to avoid a potential use-after-free.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
dbef491ebe7f3a4fb1b9111878b86a426fd540b7 before 6a733a38b983d8c2e222f13968209010cf44de87; dbef491ebe7f3a4fb1b9111878b86a426fd540b7 before 19d89b13a43640b2da2f277ee462d919d988cb6f; dbef491ebe7f3a4fb1b9111878b86a426fd540b7 before b3df61bb745eb5201eac22679a2839d4ccbf3442; dbef491ebe7f3a4fb1b9111878b86a426fd540b7 before 1ae134c012e10384cdac420b5cc6e0615cde0b55; dbef491ebe7f3a4fb1b9111878b86a426fd540b7 before 5161e67c561c4f28a5d9335a6e859b02511de92b; dbef491ebe7f3a4fb1b9111878b86a426fd540b7 before 64d322c288577793eedd352b96ef75234ed380fe; +3 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74705
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74705
git.kernel.org
https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f
git.kernel.org
https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55
git.kernel.org
https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b
git.kernel.org
https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d
git.kernel.org
https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe
git.kernel.org
https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87
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