CVE-2026-80976 Linux Kernel - Out-of-Bounds Read

Linux kernel contains a buffer out-of-bounds vulnerability caused by stale IPv6 control block values after IPv6 decapsulation in seg6, letting unprivileged users read beyond skb head, exploit requires local SID installation and packet injection.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.71% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out-of-Bounds Read
Impact
Denial Of Service, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/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 for IP6CB reset after IPv6 decapsulation.

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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