CVE-2026-52993

critical · 9.8

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 being called with a pointer to a local variable which was a copy of the caller's skb pointer. If the skb was reallocated and validation subsequently failed, the error handling path would free the original skb pointer, which had already been freed, leading to double-free. Fix this by checking if head now points to a newly allocated reassembled skb. If it does, reassign *headbuf for later freeing operations.

9.8

CVSS

0.4%

EPSS (exploit prob.)

31st

EPSS percentile

2026-06-24

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-415CWE-763

Affected products

Vendor	Product	Affected versions
linux	linux_kernel	>= 4.15, < 5.10.258
linux	linux_kernel	>= 5.11, < 5.15.209
linux	linux_kernel	>= 5.16, < 6.1.175
linux	linux_kernel	>= 6.2, < 6.6.141
linux	linux_kernel	>= 6.7, < 6.12.91
linux	linux_kernel	>= 6.13, < 6.18.33
linux	linux_kernel	>= 6.19, < 7.0.10

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-52993