Linux Kernel Netfilter Use-After-Free Rated 7.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-53212

Key Details

CVE	CVE-2026-53212
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel and Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classified as	CWE-416 (Use After Free)
Exploitation prediction (EPSS)	0.19% probability of exploitation in the next 30 days (8% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Siemens

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Subsystems	Controllers & Field I/O, OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_tunnel: fix use-after-free on object destroy

nft_tunnel_obj_destroy() calls metadata_dst_free() which directly

kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets

that took a reference via dst_hold() in nft_tunnel_obj_eval() and

are still queued (e.g. in a netem qdisc) are left with a dangling

pointer. When these packets are eventually dequeued, dst_release()

operates on freed memory.

Replace metadata_dst_free() with dst_release() so the metadata_dst

is freed only after all references are dropped. The dst subsystem

already handles metadata_dst cleanup in dst_destroy() when

DST_METADATA is set. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-53212
CVE	https://www.cve.org/CVERecord?id=CVE-2026-53212

Source

Reference

NVD

CVE