CVE-2026-52993

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-52993

Key Details

CVE	CVE-2026-52993
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, and Red Hat Enterprise Linux 9
Classified as	CWE-415 (Double Free)

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel
Red Hat	Red Hat Enterprise Linux 10
Red Hat	Red Hat Enterprise Linux 8
Red Hat	Red Hat Enterprise Linux 9

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Red Hat

Red Hat Enterprise Linux 10

Red Hat

Red Hat Enterprise Linux 8

Red Hat

Red Hat Enterprise Linux 9

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's and Red Hat's web pages for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-52993
CVE	https://www.cve.org/CVERecord?id=CVE-2026-52993

Source

Reference

NVD

CVE