CVE-2026-89486

CVE CVE-2026-89486EUVD EUVD-2026-76392Published 2026-09-11T19:43:40.000ZLast changed 2026-09-13T06:29:55.000ZCVSS 7.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.2.4; 6.16; 9e91f8a6c8688e27f4ccce7db457da87d6458836 <05ec76cfbce653e07cec19b9b8b20e33449d5d87; patch: 7.3-rc1; 9e91f8a6c8688e27f4ccce7db457da87d6458836 <3088e41292fecf132f85f79af5ee4d620b9ff1b4; 9e91f8a6c8688e27f4ccce7db457da87d6458836 <5dc0b2a9af95a97861c1bffaf1687a3173e395c5; patch: 0; patch: 6.18.50

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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