bnxt_en: Fix memory corruption when FW resources change during ifdown

Summary

In the Linux kernel, the following vulnerability has been resolved: bnxt_en: Fix memory corruption when FW resources change during ifdown bnxt_set_dflt_rings() assumes that it is always called before any TC has been created. So it doesn't take bp->num_tc into account and assumes that it is always 0 or 1. In the FW resource or capability change scenario, the FW will return flags in bnxt_hwrm_if_change() that will cause the driver to reinitialize and call bnxt_cancel_reservations(). This will lead to bnxt_init_dflt_ring_mode() calling bnxt_set_dflt_rings() and bp->num_tc may be greater than 1. This will cause bp->tx_ring[] to be sized too small and cause memory corruption in bnxt_alloc_cp_rings(). Fix it by properly scaling the TX rings by bp->num_tc in the code paths mentioned above. Add 2 helper functions to determine bp->tx_nr_rings and bp->tx_nr_rings_per_tc.

Timeline

1. Sep 16, 2025, 1:00 PM UTCCVE published
2. Jan 14, 2026, 6:14 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 21, 2026, 12:37 PM UTCRecord last updated

Affected versions

• Linux Linux

  From ec5d31e3c15d5233b491400133c67f78a320062c · fixed in dc797a4bbbcac6d19e6e2508e4df685755cd94a5; From ec5d31e3c15d5233b491400133c67f78a320062c · fixed in d00e98977ef519280b075d783653e2c492fffbb6; From ec5d31e3c15d5233b491400133c67f78a320062c · fixed in 9ab6a9950f152e094395d2e3967f889857daa185; From ec5d31e3c15d5233b491400133c67f78a320062c · fixed in 2747328ba2714f1a7454208dbbc1dc0631990b4a

• Linux Linux

  5.4

• KernelLinux

  From 5.4.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.45; From 6.13.0 · fixed in 6.16.5

References 4