CVE-2025-39810

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxec5d31e3c15d5233b491400133c67f78a320062c < d00e98977ef519280b075d783653e2c492fffbb6affected
LinuxLinuxec5d31e3c15d5233b491400133c67f78a320062c < 9ab6a9950f152e094395d2e3967f889857daa185affected
LinuxLinuxec5d31e3c15d5233b491400133c67f78a320062c < 2747328ba2714f1a7454208dbbc1dc0631990b4aaffected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux6.12.45 <= 6.12.*unaffected
LinuxLinux6.16.5 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References