CVE-2026-89487 Linux Kernel openvswitch - Broken Access Control

Linux kernel openvswitch contains a broken access control vulnerability caused by improper handling of skb_tx_error() on packets still in use, letting unprivileged attackers perform unauthorized page-cache writes, exploit requires triggering specific packet flows with MSG_ZEROCOPY skb.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.13% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation, Data Tampering
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 that moves skb_tx_error() to the flow-miss drop path.

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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