CVE-2026-89789high

CVE-2026-89789: high-severity vulnerability in Linux

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

Published

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.8epss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
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().
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/3ca3da5c305caa873ddb81e8c6b118143f6dd3d1https://git.kernel.org/stable/c/6f815c2fb6ab20385f81c353cdad0ea3b88132afhttps://git.kernel.org/stable/c/7677eb2cbf2cc7446de474c01a6b06277c0051e5https://git.kernel.org/stable/c/8d85498016a5bb56339734a14c276209fa65bafchttps://git.kernel.org/stable/c/d989e22ae9802c52c56ad4284d0caf26696cf6aehttps://git.kernel.org/stable/c/e3b9aa0773abd5d4ed90be41ce5306c146d5b09ehttps://git.kernel.org/stable/c/fcafb2b1430824bae4258c01a439ec97ca0c6973https://git.kernel.org/stable/c/fd8396cfecbd904468c71362f08aaa25f96d5337