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RDMA/bnxt_re: zero shared page before exposing to userspace

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: zero shared page before exposing to userspace bnxt_re_alloc_ucontext() allocates uctx->shpg via __get_free_page(GFP_KERNEL). The buddy allocator does not zero pages without __GFP_ZERO, so the page contains stale kernel data from whatever object most recently freed it. The page is then mapped into userspace via vm_insert_page() under BNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes 4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside bnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed to userspace unsanitised, leaking kernel memory contents. Any user with access to /dev/infiniband/uverbsX on a host with a bnxt_re device (typically rdma group membership) can read this data via a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT. Other shared pages in the same file already use get_zeroed_page() correctly: drivers/infiniband/hw/bnxt_re/ib_verbs.c srq->uctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL); cq->uctx_cq_page = (void *)get_zeroed_page(GFP_KERNEL); uctx->shpg is the only outlier. Bring it in line with the existing convention by switching to get_zeroed_page().

Announced Source revision 1
Original source ↗

CVE-2026-74584

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74584

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
        "lessThan": "53c97e9882f4e747b4ac31b211317c2eba541af9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
        "lessThan": "9896bdfd21d918e9f26a52bc6109cc77970ee0b1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
        "lessThan": "9128c2411b83a64c0a69d2ff059c741bde25a9cc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
        "lessThan": "c19b360fa10c521c0b681875cdaa51545d45a491",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
        "lessThan": "a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
        "lessThan": "e2b143df29003d2704b51f62e9297006953dbacb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
        "lessThan": "c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
        "lessThan": "f6b079629becfa977f9c51fe53ad2e6dcc55ef44",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/infiniband/hw/bnxt_re/ib_verbs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.260",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.211",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.177",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.144",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.95",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.37",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.14",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/infiniband/hw/bnxt_re/ib_verbs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74584

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33224 · Revision 1
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Publisher date
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