{"id":"CVE-2026-89486","title":"ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()","summary":"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_…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 3088e41292fecf132f85f79af5ee4d620b9ff1b4","Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 5dc0b2a9af95a97861c1bffaf1687a3173e395c5","Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 05ec76cfbce653e07cec19b9b8b20e33449d5d87","Linux 6.16"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:47:36.844Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89486","references":[{"url":"https://git.kernel.org/stable/c/3088e41292fecf132f85f79af5ee4d620b9ff1b4"},{"url":"https://git.kernel.org/stable/c/5dc0b2a9af95a97861c1bffaf1687a3173e395c5"},{"url":"https://git.kernel.org/stable/c/05ec76cfbce653e07cec19b9b8b20e33449d5d87"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89486.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89486"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532463"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89486"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89486"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89486.mbox"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00124,"epssPercentile":0.02097,"scores":{"cna":7.8,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-89486","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 3088e41292fecf132f85f79af5ee4d620b9ff1b4`\n- `Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 5dc0b2a9af95a97861c1bffaf1687a3173e395c5`\n- `Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 05ec76cfbce653e07cec19b9b8b20e33449d5d87`\n- `Linux 6.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89486.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224740,"id":"CVE-2026-89486","ts":1792401512637,"field":"cvss","old":"5.5","new":"7.8"},{"seq":224739,"id":"CVE-2026-89486","ts":1792401512637,"field":"severity","old":"medium","new":"high"},{"seq":206954,"id":"CVE-2026-89486","ts":1789749717717,"field":"cvss","old":"6.5","new":"5.5"},{"seq":202905,"id":"CVE-2026-89486","ts":1789403732887,"field":"cvss","old":"7.8","new":"6.5"},{"seq":202904,"id":"CVE-2026-89486","ts":1789403732887,"field":"severity","old":"high","new":"medium"},{"seq":198014,"id":"CVE-2026-89486","ts":1789384321387,"field":"cvss","old":"6.5","new":"7.8"},{"seq":198013,"id":"CVE-2026-89486","ts":1789384321387,"field":"severity","old":"medium","new":"high"},{"seq":183523,"id":"CVE-2026-89486","ts":1789356675721,"field":"cvss","old":"7.8","new":"6.5"},{"seq":183522,"id":"CVE-2026-89486","ts":1789356675721,"field":"severity","old":"high","new":"medium"},{"seq":153270,"id":"CVE-2026-89486","ts":1789285349821,"field":"cvss","old":null,"new":"7.8"},{"seq":153269,"id":"CVE-2026-89486","ts":1789285349821,"field":"severity","old":"none","new":"high"},{"seq":147169,"id":"CVE-2026-89486","ts":1789270198584,"field":"cvss","old":null,"new":"6.5"},{"seq":147168,"id":"CVE-2026-89486","ts":1789270198584,"field":"severity","old":"none","new":"medium"},{"seq":108924,"id":"CVE-2026-89486","ts":1789183729567,"field":"cvss","old":null,"new":"6.5"},{"seq":108923,"id":"CVE-2026-89486","ts":1789183729567,"field":"severity","old":"none","new":"medium"}]}