CVE-2026-89486

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89486

Key Details

CVE	CVE-2026-89486
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89486
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89486

Source

Reference

NVD

CVE