CVE-2026-92495 (GCVE-0-2026-92495)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-10-19 09:04
VLAI
Title
RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ea222485788208cd79bad42d25aae9232b33a934 , < 5361fb1e5bc246f9a2c0721543f72c8dac200769 (git)
Affected: ea222485788208cd79bad42d25aae9232b33a934 , < 13e7861809ef9e7e720ff5f0af1d4293a6d0a9b4 (git)
Affected: ea222485788208cd79bad42d25aae9232b33a934 , < 0afbfe019c881483337d9f8304e678af05ebe7cc (git)
Affected: ea222485788208cd79bad42d25aae9232b33a934 , < 518df61b9b0a5b288dfa72c87246045329c18b8c (git)
Affected: ea222485788208cd79bad42d25aae9232b33a934 , < 9b66c9af7172ffcf727214fa0ebe9a5e1ed6eb16 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/bnxt_re/ib_verbs.c"
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      "cpeApplicability": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap\n\nbnxt_re_mmap() rejects VM_WRITE for the DBR_PAGE and TOGGLE_PAGE mmap\nflags, but a read-only mapping can still retain VM_MAYWRITE. nd later\nbe upgraded with mprotect(PROT_WRITE). This can bypass the write check\nthat only runs at mmap time.\n\nClear VM_MAYWRITE before vm_insert_page() in the shared DBR/toggle-page\nbranch, matching the existing policy that userspace writes are not\nexpected for these pages."
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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      ],
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    "assignerShortName": "Linux",
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    "datePublished": "2026-09-17T16:10:10.747Z",
    "dateReserved": "2026-09-16T12:21:13.871Z",
    "dateUpdated": "2026-10-19T09:04:01.510Z",
    "state": "PUBLISHED"
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      "version": "4"
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          }
        ],
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92495.json",
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  }
}



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