{"id":"CVE-2026-80848","revision":"791e248fd59c4feb9d114bb4aede40c3","records":[{"revision":"791e248fd59c4feb9d114bb4aede40c3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80848","aliases":[],"title":"xfrm: espintcp: fix UAF during close","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: espintcp: fix UAF during close\n\nZDI reported and analyzed a race condition during close for espintcp\nsockets:\n\n    espintcp_close() frees emsg->skb via kfree_skb() without holding\n    any socket lock. Concurrently, the xfrm_trans_reinject work queue\n    invokes esp_output_tcp_finish() -> espintcp_push_skb() ->\n    espintcp_push_msgs() -> skb_send_sock_locked(), which reads the\n    same skb as a data source.\n\nFix this by adding a synchronize_rcu() call after resetting sk_prot,\nsince esp_output_tcp_finish() runs under RCU and won't use a socket\nwith sk_prot == &tcp_prot.  Simply taking the socket lock in\nespintcp_close() could lead to leaks, if esp_output_tcp_finish()\nre-adds an skb in the slot we just freed. After this, the existing\nbarrier() is no longer needed.","state":0,"publishedAt":"2026-09-04T15:54:58.427+00:00","modifiedAt":"2026-10-19T08:44:42.445+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                        \"net/xfrm/espintcp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"29121c5e6591da527e8e36ddac7120dc527f574d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"ed5d9102190c45fc70121c036b0626b740040b75\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"4bc0dfa28dca6fc0084203732695968049c44072\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"ff8dd7a932f34409a56e1b91a1219340f17457e9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"4b31a875693c480c611519faca46216514e3e052\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"24efebecf415ba264adba0f0491cec436463a14f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"eb3bbf29c723fe75c0eb92be14f0ec92971fe272\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"54b41ad14da9a981131ab6e4d3f79321a503ea5d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593\",\n                            \"lessThan\": \"deb232e884877bf10b4ce2580909eedec986c284\",\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                        \"net/xfrm/espintcp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.269\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.220\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.187\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.156\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.108\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.49\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.13\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.3\",\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":[],"references":["https://git.kernel.org/stable/c/29121c5e6591da527e8e36ddac7120dc527f574d","https://git.kernel.org/stable/c/ed5d9102190c45fc70121c036b0626b740040b75","https://git.kernel.org/stable/c/4bc0dfa28dca6fc0084203732695968049c44072","https://git.kernel.org/stable/c/ff8dd7a932f34409a56e1b91a1219340f17457e9","https://git.kernel.org/stable/c/4b31a875693c480c611519faca46216514e3e052","https://git.kernel.org/stable/c/24efebecf415ba264adba0f0491cec436463a14f","https://git.kernel.org/stable/c/eb3bbf29c723fe75c0eb92be14f0ec92971fe272","https://git.kernel.org/stable/c/54b41ad14da9a981131ab6e4d3f79321a503ea5d","https://git.kernel.org/stable/c/deb232e884877bf10b4ce2580909eedec986c284"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80848","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80848","identifiers":["CVE-2026-80848"]},"retained":false,"historicalAffected":[]}],"coverage":[]}