CVE-2026-89951 Linux kernel batman-adv - Use After Free

Linux kernel batman-adv contains a stale receive device vulnerability caused by reusing skb from deleted hard interfaces during fragment reassembly, letting attackers cause use-after-free and potential denial of service, exploit requires network packet injection.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
16 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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