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CVE

CVE-2026-74705

udp: fix potential use-after-free in tunnel segmentation
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CVE

CVE-2026-74705

udp: fix potential use-after-free in tunnel segmentation

In the Linux kernel, the following vulnerability has been resolved:

udp: fix potential use-after-free in tunnel segmentation

_skbudptunnelsegment() 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the saved UDP header pointer is no longer valid.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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
10
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f, https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55, https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b, https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d, https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe, https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87, https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442, https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74705.json, https://nvd.nist.gov/vuln/detail/CVE-2026-74705, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

10

CVSS Score
0
10

Basic Information

Base CVSS
10
EPSS Probability
0.00734%
EPSS Percentile
0.52545%
Introduced Version
dbef491ebe7f3a4fb1b9111878b86a426fd540b7,4.6.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
d0f86fb36eb260abd10007b62c9dcc1028e03e61,5.10.265,5.15.216,6.1.183,6.6.152,6.12.104,6.18.45,7.1.9,6.1.187-1,6.12.107-1~deb12u1,6.12.105-1,0:6.12.0-206.104.3.3.el10uek,0:5.15.0-324.217.5.2.el8uek,0:5.15.0-324.217.5.2.el9uek,0:6.12.0-206.104.3.3.el9uek,0:5.10.265-265.1078.amzn2,0:1.0-0.amzn2,0:5.15.220-153.252.amzn2,1:6.1.186-228.374.amzn2023,1:1.0-0.amzn2023,1:6.18.48-107.148.amzn2023

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