CVE-2026-52985 Linux CVE debrief

Who should care

Linux kernel users and administrators should be aware of this vulnerability and ensure they are running a patched version of the kernel. They should inventory Linux kernel versions and assess for exposure, apply patches or updates provided by the Linux kernel maintainers, monitor for potential exploitation attempts, and consider implementing compensating controls for affected systems.

Technical summary

The vulnerability was found in the netdevsim component of the Linux kernel. The issue arose from the use of skb_put, which does not initialize the allocated memory. An attacker could potentially exploit this to leak uninitialized data. The fix involves replacing skb_put with skb_put_zero, ensuring that the IP header is fully initialized. This change guarantees that the IP header in dummy sk_buff is zero-initialized, preventing potential data leaks.

Defensive priority

Medium

Recommended defensive actions

• Inventory Linux kernel versions and assess for exposure
• Apply patches or updates provided by the Linux kernel maintainers
• Monitor for potential exploitation attempts
• Consider implementing compensating controls for affected systems
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-06-24T17:17:09.260Z and last modified on 2026-07-10T19:24:19.850Z. The NVD entry is currently Awaiting Analysis. This issue is related to the netdevsim component of the Linux kernel. The vulnerability arises from the use of skb_put, which does not initialize the allocated memory. The fix involves replacing skb_put with skb_put_zero, ensuring that the IP header is fully initialized. Linux kernel users and administrators should verify their kernel versions and apply patches or updates provided by the Linux kernel maintainers.

Official resources