CVE-2026-53177 bnxt_en: Fix NULL pointer dereference
A NULL pointer dereference in the bnxt_en driver during PCIe error recovery on a closed NIC can cause a kernel crash, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53177?
CVE-2026-53177 is a medium-severity vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
bnxt_en: Fix NULL pointer dereference
PCIe errors detected by a Root Port or Downstream Port cause error recovery services to run on all subordinate devices regardless of administrative state.
The .error_detected() callback, bnxt_io_error_detected(), disables and synchronizes IRQs via bnxt_disable_int_sync(), which calls bnxt_cp_num_to_irq_num() to map completion rings to IRQs using bp->bnapi.
Since bp->bnapi is allocated on NIC open and freed on NIC close, PCIe error recovery on a closed NIC can dereference a NULL pointer.
Check if bp->bnapi is NULL before disabling and synchronizing IRQs.
Weakness: CWE-476
Which versions are affected by CVE-2026-53177?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53177?
Apply the vendor's patch.
Is CVE-2026-53177 being exploited?
There is no known exploitation of CVE-2026-53177 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90312, BELL-CVE-2026-53177, DEBIAN-CVE-2026-53177, GHSA-fgqh-527q-6hx4, ROOT-OS-DEBIAN-11-CVE-2026-53177, ROOT-OS-DEBIAN-12-CVE-2026-53177 and 3 more.