7.8

CVE-2026-89486

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

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version 9e91f8a6c8688e27f4ccce7db457da87d6458836
Version < 3088e41292fecf132f85f79af5ee4d620b9ff1b4
Status affected
Version 9e91f8a6c8688e27f4ccce7db457da87d6458836
Version < 5dc0b2a9af95a97861c1bffaf1687a3173e395c5
Status affected
Version 9e91f8a6c8688e27f4ccce7db457da87d6458836
Version < 05ec76cfbce653e07cec19b9b8b20e33449d5d87
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 6.16
Status affected
Version 0
Version < 6.16
Status unaffected
Version <= 6.18.*
Version 6.18.50
Status unaffected
Version <= 7.2.*
Version 7.2.4
Status unaffected
Version <= *
Version 7.3-rc1
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.12% 0.024
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/3088e41292fecf132f85f79af5ee4d620b9ff1b4
https://git.kernel.org/stable/c/5dc0b2a9af95a97861c1bffaf1687a3173e395c5
https://git.kernel.org/stable/c/05ec76cfbce653e07cec19b9b8b20e33449d5d87