Answer in brief
CVE-2026-89789 records a Unknown severity vulnerability in gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <fcafb2b1430824bae4258c01a439ec97ca0c6973 || >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <3ca3da5c305caa873ddb81e8c6b118143f6dd3d1 || >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <6f815c2fb6ab20385f81c353cdad0ea3b88132af || >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <e3b9aa0773abd5d4ed90be41ce5306c146d5b09e || >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <fd8396cfecbd904468c71362f08aaa25f96d5337 || >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <7677eb2cbf2cc7446de474c01a6b06277c0051e5 || >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <8d85498016a5bb56339734a14c276209fa65bafc || >=459aa660eb1d8ce67080da1983bb81d716aa5a69 <d989e22ae9802c52c56ad4284d0caf26696cf6ae | fcafb2b1430824bae4258c01a439ec97ca0c6973, 3ca3da5c305caa873ddb81e8c6b118143f6dd3d1, 6f815c2fb6ab20385f81c353cdad0ea3b88132af, e3b9aa0773abd5d4ed90be41ce5306c146d5b09e, fd8396cfecbd904468c71362f08aaa25f96d5337, 7677eb2cbf2cc7446de474c01a6b06277c0051e5, 8d85498016a5bb56339734a14c276209fa65bafc, d989e22ae9802c52c56ad4284d0caf26696cf6ae |
| Linux/Linuxgeneric | 4.7 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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().
Quoted source text, attributed separately from HOL analysis.