CVE-2026-74705
udp: fix potential use-after-free in tunnel segmentation
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head, the saved UDP header pointer is no longer valid.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.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Aug. 22, 2026, 4:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the latest version.
- Ensure UDP tunnel segmentation is handled correctly.
- Verify the UDP header is retrieved after memory allocation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74705.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74705 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74705
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74705 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74705 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'dbef491ebe7f3a4fb1b9111878b86a426fd540b7', 'lessThan': '6a733a38b983d8c2e222f13968209010cf44de87', 'versionType': 'git'}, {'status': 'affected', 'version': 'dbef491ebe7f3a4fb1b9111878b86a426fd540b7', 'lessThan': '19d89b13a43640b2da2f277ee462d919d988cb6f', 'versionType': 'git'}, {'status': 'affected', 'version': 'dbef491ebe7f3a4fb1b9111878b86a426fd540b7', 'lessThan': 'b3df61bb745eb5201eac22679a2839d4ccbf3442', 'versionType': 'git'}, {'status': 'affected', 'version': 'dbef491ebe7f3a4fb1b9111878b86a426fd540b7', 'lessThan': '1ae134c012e10384cdac420b5cc6e0615cde0b55', 'versionType': 'git'}, {'status': 'affected', 'version': 'dbef491ebe7f3a4fb1b9111878b86a426fd540b7', 'lessThan': '5161e67c561c4f28a5d9335a6e859b02511de92b', 'versionType': 'git'}, {'status': 'affected', 'version': 'dbef491ebe7f3a4fb1b9111878b86a426fd540b7', 'lessThan': '64d322c288577793eedd352b96ef75234ed380fe', 'versionType': 'git'}, {'status': 'affected', 'version': 'dbef491ebe7f3a4fb1b9111878b86a426fd540b7', 'lessThan': '588d4a6795d99d080f74ef0b5f391ea8c453ae5d', 'versionType': 'git'}, {'status': 'affected', 'version': 'dbef491ebe7f3a4fb1b9111878b86a426fd540b7', 'lessThan': 'd0f86fb36eb260abd10007b62c9dcc1028e03e61', 'versionType': 'git'}], 'programFiles': ['net/ipv4/udp_offload.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.265', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.216', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.183', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.152', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.104', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv4/udp_offload.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f Added Reference https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55 Added Reference https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b Added Reference https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d Added Reference https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe Added Reference https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87 Added Reference https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442 Added Reference https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61