CVE-2026-89789

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89789

Key Details

CVE	CVE-2026-89789
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-19
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

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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

gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free

gtp_newlink()'s error path frees tid_hash and addr_hash without

waiting for an RCU grace period after clearing sk_user_data. A

concurrent gtp_encap_recv() in softirq may still hold the gtp_dev

pointer obtained via rcu_dereference_sk_user_data() and access the

freed memory.

BUG: KASAN: slab-use-after-free in gtp0_pdp_find+0x1f6/0x200 (gtp.c:152)

Call Trace:

<IRQ>

gtp0_pdp_find+0x1f6/0x200

gtp_encap_recv+0x527/0x24b0

udp_queue_rcv_one_skb+0x75f/0xc10

Add synchronize_net() before the kfree calls in out_hashtable, which

covers all error paths from both gtp_encap_enable() and

gtp_create_sockets(). (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89789
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89789

Source

Reference

NVD

CVE