CVE-2026-92495 PUBLISHED

RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap

Assigner: Linux
Reserved: 16.09.2026 Published: 17.09.2026 Updated: 17.09.2026

In the Linux kernel, the following vulnerability has been resolved:

RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap

bnxt_re_mmap() rejects VM_WRITE for the DBR_PAGE and TOGGLE_PAGE mmap flags, but a read-only mapping can still retain VM_MAYWRITE. nd later be upgraded with mprotect(PROT_WRITE). This can bypass the write check that only runs at mmap time.

Clear VM_MAYWRITE before vm_insert_page() in the shared DBR/toggle-page branch, matching the existing policy that userspace writes are not expected for these pages.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from ea222485788208cd79bad42d25aae9232b33a934 to 5361fb1e5bc246f9a2c0721543f72c8dac200769 (excl.)
  • affected from ea222485788208cd79bad42d25aae9232b33a934 to 13e7861809ef9e7e720ff5f0af1d4293a6d0a9b4 (excl.)
  • affected from ea222485788208cd79bad42d25aae9232b33a934 to 0afbfe019c881483337d9f8304e678af05ebe7cc (excl.)
  • affected from ea222485788208cd79bad42d25aae9232b33a934 to 518df61b9b0a5b288dfa72c87246045329c18b8c (excl.)
  • affected from ea222485788208cd79bad42d25aae9232b33a934 to 9b66c9af7172ffcf727214fa0ebe9a5e1ed6eb16 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.6 is affected
  • unaffected from 0 to 6.6 (excl.)
  • unaffected from 6.6.157 to 6.6.* (incl.)
  • unaffected from 6.12.110 to 6.12.* (incl.)
  • unaffected from 6.18.52 to 6.18.* (incl.)
  • unaffected from 7.2.6 to 7.2.* (incl.)
  • unaffected from 7.3-rc1 to * (incl.)

References