CVE-2026-89789

CVE CVE-2026-89789EUVD EUVD-2026-80310Published 2026-09-16T08:48:25.000ZLast changed 2026-09-16T14:38:38.000ZCVSS 7.8

What the advisory describes

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().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.6.157; patch: 7.3-rc1; patch: 6.1.188; 459aa660eb1d8ce67080da1983bb81d716aa5a69 <fcafb2b1430824bae4258c01a439ec97ca0c6973; 459aa660eb1d8ce67080da1983bb81d716aa5a69 <6f815c2fb6ab20385f81c353cdad0ea3b88132af; 459aa660eb1d8ce67080da1983bb81d716aa5a69 <d989e22ae9802c52c56ad4284d0caf26696cf6ae; patch: 5.15.221; 459aa660eb1d8ce67080da1983bb81d716aa5a69 <8d85498016a5bb56339734a14c276209fa65bafc; patch: 7.2.6; 459aa660eb1d8ce67080da1983bb81d716aa5a69 <fd8396cfecbd904468c71362f08aaa25f96d5337; 459aa660eb1d8ce67080da1983bb81d716aa5a69 <e3b9aa0773abd5d4ed90be41ce5306c146d5b09e; patch: 6.18.52; 4.7; 459aa660eb1d8ce67080da1983bb81d716aa5a69 <7677eb2cbf2cc7446de474c01a6b06277c0051e5; patch: 0; 459aa660eb1d8ce67080da1983bb81d716aa5a69 <3ca3da5c305caa873ddb81e8c6b118143f6dd3d1; patch: 6.12.110; patch: 5.10.270

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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