CVE-2026-89486High· 7.8▾ TwilightIn 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_…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 6.5
— → 7.8
none → high
7.8 → 6.5
high → medium
6.5 → 7.8
medium → high
7.8 → 6.5
high → medium
6.5 → 5.5
0.2% → 0.2%
Last analysed / modified upstream
5.5 → 7.8
medium → high
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.
Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 3088e41292fecf132f85f79af5ee4d620b9ff1b4Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 5dc0b2a9af95a97861c1bffaf1687a3173e395c5Linux >= 9e91f8a6c8688e27f4ccce7db457da87d6458836 < 05ec76cfbce653e07cec19b9b8b20e33449d5d87Linux 6.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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