ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user() (CVE-2026-89486) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89486

ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()

Answer in brief

CVE-2026-89486 records a Unknown severity vulnerability in ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user(). 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.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=9e91f8a6c8688e27f4ccce7db457da87d6458836 <3088e41292fecf132f85f79af5ee4d620b9ff1b4 \|\| >=9e91f8a6c8688e27f4ccce7db457da87d6458836 <5dc0b2a9af95a97861c1bffaf1687a3173e395c5 \|\| >=9e91f8a6c8688e27f4ccce7db457da87d6458836 <05ec76cfbce653e07cec19b9b8b20e33449d5d87	3088e41292fecf132f85f79af5ee4d620b9ff1b4, 5dc0b2a9af95a97861c1bffaf1687a3173e395c5, 05ec76cfbce653e07cec19b9b8b20e33449d5d87
Linux/Linuxgeneric	6.16	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3088e41292fecf132f85f79af5ee4d620b9ff1b4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user() Commit 9e91f8a6c868 ("ipmi:msghandler: Remove srcu for the ipmi_interfaces list") dropped the synchronize_rcu() between unlinking the command receivers from intf->cmd_rcvrs and freeing them, updating only the comment that explains why the barrier is needed. The cmd_rcvrs list is still traversed under plain RCU: find_cmd_rcvr() walks it inside rcu_read_lock(), and handle_ipmb_get_msg_cmd() borrows rcvr->user from that lookup within the same read-side section. Without the grace period, _ipmi_destroy_user() can kfree() a cmd_rcvr while a reader still holds a pointer to it, causing a use-after-free. The rework only made srcu unnecessary for the interfaces list; the cmd_rcvrs list still relies on plain RCU. Restore the synchronize_rcu() before freeing the receivers.

Quoted source text, attributed separately from HOL analysis.