What is CVE-2026-52993?

CVE-2026-52993 is a critical-severity vulnerability in Linux, classified under Double Free. CVSS score: 9.8/10. Published 2026-06-24.

How severe is CVE-2026-52993?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Double Free in Linux

CVE-2026-52993

In the Linux kernel, the following vulnerability has been resolved: tipc: fix double-free in tipc_buf_append() tipc_msg_validate() can potentially reallocate the skb it is validating, freeing the old one. In tipc_buf_append(), it was be…

Vulnerability class: Double Free

EPSS: 0.004 (29.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions d618d09a68e4eed7a435beb2e355250f6f40664a, 4.15, 0
Linux Linux_kernel

Weakness classification (CWE)

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Third Party Advisory)
0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Third Party Advisory)

Frequently asked questions

What is CVE-2026-52993?: CVE-2026-52993 is a critical-severity vulnerability in Linux, classified under Double Free. CVSS score: 9.8/10. Published 2026-06-24.
How severe is CVE-2026-52993?: Critical severity. CVSS v3 base score is 9.8 out of 10.