What is CVE-2026-52940?

CVE-2026-52940 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2026-06-24.

How severe is CVE-2026-52940?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Linux

CVE-2026-52940

In the Linux kernel, the following vulnerability has been resolved: tun: zero the whole vnet header in tun_put_user() tun_put_user() declares an on-stack struct virtio_net_hdr_v1_hash_tunnel without zeroing it. For a non-tunnel skb, virt…

EPSS: 0.001 (1.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Linux — versions 288f30435132d2f9e7a29ec9b9745a4f9dc7fd37, 6.17, 0
Linux Linux_kernel — versions 7.1

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2026-52940?: CVE-2026-52940 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2026-06-24.
How severe is CVE-2026-52940?: Medium severity. CVSS v3 base score is 5.5 out of 10.