CVE-2026-63973
Low risk· EPSS 11%Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel's MANA network driver, NULL pointer guards are missing in the teardown path after a partial queue allocation failure. Freed pointers are later dereferenced in functions like mana_chn_setxdp(), mana_destroy_vport(), mana_fence_rqs(), and mana_dealloc_queues(), causing a kernel panic.
Risk Assessment
The organization is at risk of a kernel panic when queue allocation fails in the MANA driver, which can occur during normal operation, MTU changes, or error recovery. This leads to network service disruption and potential data loss.
Recommendation
Immediately update the Linux kernel to a version containing the fix that adds NULL guards for apc->rxqs and apc->tx_qp pointers in the MANA driver teardown paths.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: mana: Add NULL guards in teardown path to prevent panic on attach failure When queue allocation fails partway through, the error cleanup frees and NULLs apc->tx_qp and apc->rxqs. Multiple teardown paths such as mana_remove(), mana_change_mtu() recovery, and internal error handling in mana_alloc_queues() can subsequently call into functions that dereference these pointers without NULL checks: - mana_chn_setxdp() dereferences apc->rxqs[0], causing a NULL pointer dereference panic (CR2: 0000000000000000 at mana_chn_setxdp+0x26). - mana_destroy_vport() iterates apc->rxqs without a NULL check. - mana_fence_rqs() iterates apc->rxqs without a NULL check. - mana_dealloc_queues() iterates apc->tx_qp without a NULL check. Add NULL guards for apc->rxqs in mana_fence_rqs(), mana_destroy_vport(), and before the mana_chn_setxdp() call. Add a NULL guard for apc->tx_qp in mana_dealloc_queues() to skip TX queue draining when TX queues were never allocated or already freed.