Answer in brief
CVE-2026-89789 records a High severity (CVSS 7.8) 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.
CVSS is 7.8. 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
Oct 19, 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.