CVE-2026-63972 Details
Description
In the Linux kernel, the following vulnerability has been resolved: net: mana: Skip redundant detach on already-detached port When mana_per_port_queue_reset_work_handler() runs after a previous detach succeeded but attach failed, the port is left in a detached state with apc->tx_qp and apc->rxqs already freed. Calling mana_detach() again unconditionally leads to NULL pointer dereferences during queue teardown. Add an early exit in mana_detach() when the port is already in detached state (!netif_device_present) for non-close callers, making it safe to call idempotently. This allows the queue reset handler and other recovery paths to simply retry mana_attach() without redundant teardown.
A vulnerability in the Linux kernel's Microsoft Mana Ethernet driver can lead to null pointer dereferences during queue teardown. This issue occurs when the port is left in a detached state after a successful detach operation, but the subsequent attach attempt fails. In this scenario, the driver's transmit and receive queue pointers are freed, and an unconditional call to detach the port again causes a null pointer dereference. The vulnerability affects the Linux kernel stable tree.
The vulnerability has been addressed by modifying the 'mana_detach' function to include an early exit when the port is already detached. This change prevents redundant detach operations and allows recovery processes to safely retry attaching the port without causing a null pointer dereference.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |