{"id":"CVE-2026-89486","revision":"021574e611d14a7c984c716bb24936e1","records":[{"revision":"021574e611d14a7c984c716bb24936e1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89486","aliases":[],"title":"ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()\n\nCommit 9e91f8a6c868 (\"ipmi:msghandler: Remove srcu for the\nipmi_interfaces list\") dropped the synchronize_rcu() between unlinking\nthe command receivers from intf->cmd_rcvrs and freeing them, updating\nonly the comment that explains why the barrier is needed.\n\nThe cmd_rcvrs list is still traversed under plain RCU: find_cmd_rcvr()\nwalks it inside rcu_read_lock(), and handle_ipmb_get_msg_cmd() borrows\nrcvr->user from that lookup within the same read-side section. Without\nthe grace period, _ipmi_destroy_user() can kfree() a cmd_rcvr while a\nreader still holds a pointer to it, causing a use-after-free.\n\nThe rework only made srcu unnecessary for the interfaces list; the\ncmd_rcvrs list still relies on plain RCU. Restore the synchronize_rcu()\nbefore freeing the receivers.","state":0,"publishedAt":"2026-09-11T19:43:40.116+00:00","modifiedAt":"2026-10-19T08:47:36.844+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/char/ipmi/ipmi_msghandler.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9e91f8a6c8688e27f4ccce7db457da87d6458836\",\n                            \"lessThan\": \"3088e41292fecf132f85f79af5ee4d620b9ff1b4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9e91f8a6c8688e27f4ccce7db457da87d6458836\",\n                            \"lessThan\": \"5dc0b2a9af95a97861c1bffaf1687a3173e395c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9e91f8a6c8688e27f4ccce7db457da87d6458836\",\n                            \"lessThan\": \"05ec76cfbce653e07cec19b9b8b20e33449d5d87\",\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/char/ipmi/ipmi_msghandler.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.16\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\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/3088e41292fecf132f85f79af5ee4d620b9ff1b4","https://git.kernel.org/stable/c/5dc0b2a9af95a97861c1bffaf1687a3173e395c5","https://git.kernel.org/stable/c/05ec76cfbce653e07cec19b9b8b20e33449d5d87"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89486","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89486","identifiers":["CVE-2026-89486"]},"retained":false,"historicalAffected":[]}],"coverage":[]}