CVE-2026-89486: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 9e91f8a6c8688e27f4ccce7db457da87d6458836 преди 3088e41292fecf132f85f79af5ee4d620b9ff1b4; 9e91f8a6c8688e27f4ccce7db457da87d6458836 преди 5dc0b2a9af95a97861c1bffaf1687a3173e395c5; 9e91f8a6c8688e27f4ccce7db457da87d6458836 преди 05ec76cfbce653e07cec19b9b8b20e33449d5d87
• Linux Linux: 6.16; преди 6.16; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; 7.3 до *

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-89486
• https://nvd.nist.gov/vuln/detail/CVE-2026-89486
• https://git.kernel.org/stable/c/3088e41292fecf132f85f79af5ee4d620b9ff1b4
• https://git.kernel.org/stable/c/5dc0b2a9af95a97861c1bffaf1687a3173e395c5
• https://git.kernel.org/stable/c/05ec76cfbce653e07cec19b9b8b20e33449d5d87