{"id":"CVE-2026-89789","revision":"55bf7920451e4627b7cbc45d8fdd2529","records":[{"revision":"55bf7920451e4627b7cbc45d8fdd2529","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89789","aliases":[],"title":"gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free\n\ngtp_newlink()'s error path frees tid_hash and addr_hash without\nwaiting for an RCU grace period after clearing sk_user_data. A\nconcurrent gtp_encap_recv() in softirq may still hold the gtp_dev\npointer obtained via rcu_dereference_sk_user_data() and access the\nfreed memory.\n\n  BUG: KASAN: slab-use-after-free in gtp0_pdp_find+0x1f6/0x200 (gtp.c:152)\n  Call Trace:\n   <IRQ>\n   gtp0_pdp_find+0x1f6/0x200\n   gtp_encap_recv+0x527/0x24b0\n   udp_queue_rcv_one_skb+0x75f/0xc10\n\nAdd synchronize_net() before the kfree calls in out_hashtable, which\ncovers all error paths from both gtp_encap_enable() and\ngtp_create_sockets().","state":0,"publishedAt":"2026-09-16T08:48:25.689+00:00","modifiedAt":"2026-10-19T08:52:43.083+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/gtp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"459aa660eb1d8ce67080da1983bb81d716aa5a69\",\n                            \"lessThan\": \"fcafb2b1430824bae4258c01a439ec97ca0c6973\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"459aa660eb1d8ce67080da1983bb81d716aa5a69\",\n                            \"lessThan\": \"3ca3da5c305caa873ddb81e8c6b118143f6dd3d1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"459aa660eb1d8ce67080da1983bb81d716aa5a69\",\n                            \"lessThan\": \"6f815c2fb6ab20385f81c353cdad0ea3b88132af\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"459aa660eb1d8ce67080da1983bb81d716aa5a69\",\n                            \"lessThan\": \"e3b9aa0773abd5d4ed90be41ce5306c146d5b09e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"459aa660eb1d8ce67080da1983bb81d716aa5a69\",\n                            \"lessThan\": \"fd8396cfecbd904468c71362f08aaa25f96d5337\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"459aa660eb1d8ce67080da1983bb81d716aa5a69\",\n                            \"lessThan\": \"7677eb2cbf2cc7446de474c01a6b06277c0051e5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"459aa660eb1d8ce67080da1983bb81d716aa5a69\",\n                            \"lessThan\": \"8d85498016a5bb56339734a14c276209fa65bafc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"459aa660eb1d8ce67080da1983bb81d716aa5a69\",\n                            \"lessThan\": \"d989e22ae9802c52c56ad4284d0caf26696cf6ae\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/gtp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/fcafb2b1430824bae4258c01a439ec97ca0c6973","https://git.kernel.org/stable/c/3ca3da5c305caa873ddb81e8c6b118143f6dd3d1","https://git.kernel.org/stable/c/6f815c2fb6ab20385f81c353cdad0ea3b88132af","https://git.kernel.org/stable/c/e3b9aa0773abd5d4ed90be41ce5306c146d5b09e","https://git.kernel.org/stable/c/fd8396cfecbd904468c71362f08aaa25f96d5337","https://git.kernel.org/stable/c/7677eb2cbf2cc7446de474c01a6b06277c0051e5","https://git.kernel.org/stable/c/8d85498016a5bb56339734a14c276209fa65bafc","https://git.kernel.org/stable/c/d989e22ae9802c52c56ad4284d0caf26696cf6ae"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89789","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89789","identifiers":["CVE-2026-89789"]},"retained":false,"historicalAffected":[]}],"coverage":[]}