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RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe get_srq_wqe() reads wqe->dma.num_sge from the shared receive queue buffer, which is mapped into userspace. It validates num_sge against max_sge, but then re-reads the same field to calculate the memcpy size. A concurrent userspace thread can modify num_sge between validation and use, causing a heap buffer overflow when copying the WQE into qp->resp.srq_wqe. Read num_sge into a local variable and use it for both the bounds check and the size calculation.

Announced Source revision 1
Original source ↗

CVE-2026-74378

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-2026-74378

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": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "e48daa94ad2d406225b73491fc935064716f0ec7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "3cfa2a3adc51b7c57729961a03446962ff10e3d2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "cd19a6345e3727adafafa5954b58b13c92e13b80",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "3e07ea9579dc9553d2285c26c2823931358aa3b8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "02558c86b6b761063e9399e6b939984500327ef1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "b9800d7953d119bcc068c74587d48e4ba0313629",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
        "lessThan": "22b8fbded65b8c441b634a185f8da67657df6c50",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_resp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_resp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74378

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33115 · Revision 1
Added to Heist Feed
Publisher date
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