CVE-2026-81000 Linux Kernel net tun - Buffer Overflow

Linux kernel net tun driver contains a buffer overflow caused by improper handling of skb headroom and alignment in tun_get_user(), letting attackers cause memory corruption, exploit requires crafted oversized headroom request.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Required
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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