Bug 2436816 (CVE-2026-23084)

Summary: CVE-2026-23084 kernel: be2net: Fix NULL pointer dereference in be_cmd_get_mac_from_list
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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A NULL pointer dereference vulnerability was found in the Linux kernel's be2net driver for Emulex BladeEngine network adapters. The be_cmd_get_mac_from_list() function is called with pmac_id_valid set to false and pmac_id set to NULL, violating the function's contract. When the function attempts to store the PMAC_ID retrieved from firmware at the NULL address, a kernel crash occurs.
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Description OSIDB Bzimport 2026-02-04 17:04:47 UTC 
In the Linux kernel, the following vulnerability has been resolved:

be2net: Fix NULL pointer dereference in be_cmd_get_mac_from_list

When the parameter pmac_id_valid argument of be_cmd_get_mac_from_list() is
set to false, the driver may request the PMAC_ID from the firmware of the
network card, and this function will store that PMAC_ID at the provided
address pmac_id. This is the contract of this function.

However, there is a location within the driver where both
pmac_id_valid == false and pmac_id == NULL are being passed. This could
result in dereferencing a NULL pointer.

To resolve this issue, it is necessary to pass the address of a stub
variable to the function.
Comment 1 Jon Moroney 2026-02-04 20:16:47 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026020422-CVE-2026-23084-8073@gregkh/T