CVE-2026-89789

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Source
https://cve.org/CVERecord?id=CVE-2026-89789
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89789.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-89789
Downstream
Published
2026-09-16T08:48:25Z
Modified
2026-09-18T03:48:32Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free
Details

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: 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().

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89789.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
459aa660eb1d8ce67080da1983bb81d716aa5a69
Fixed
fcafb2b1430824bae4258c01a439ec97ca0c6973
Fixed
3ca3da5c305caa873ddb81e8c6b118143f6dd3d1
Fixed
6f815c2fb6ab20385f81c353cdad0ea3b88132af
Fixed
e3b9aa0773abd5d4ed90be41ce5306c146d5b09e
Fixed
fd8396cfecbd904468c71362f08aaa25f96d5337
Fixed
7677eb2cbf2cc7446de474c01a6b06277c0051e5
Fixed
8d85498016a5bb56339734a14c276209fa65bafc
Fixed
d989e22ae9802c52c56ad4284d0caf26696cf6ae

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89789.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.7.0
Fixed
5.10.270
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.221
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.188
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.157
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.110
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.52
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.2.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89789.json"