GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-74377 (GCVE-0-2026-74377)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46
VLAI
Title
RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path For non-SRQ QPs, the responder reads WQE fields directly from the shared queue buffer mapped into userspace. This allows a malicious user to modify fields like num_sge or sge entries while the kernel is processing the WQE, leading to out-of-bounds reads in rxe_resp_check_length() and copy_data(). Introduce get_recv_wqe() that validates num_sge and copies the WQE to a kernel-local buffer before processing, matching the approach already used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is reused since SRQ and non-SRQ paths are mutually exclusive per QP.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 2e60378fb3c8b51c94103bb40014c4fe38fa5033 (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78 (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 9fa785137303f7109c23dea779b8dedc67c9b531 (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < 5420eebf3b3c162bfaf965f30e61cd1d689e5732 (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b (git)
Affected: 8700e3e7c4857d28ebaa824509934556da0b3e76 , < d6ab440240a04b8737ee4c7bb21af9182e451733 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_resp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2e60378fb3c8b51c94103bb40014c4fe38fa5033",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "9fa785137303f7109c23dea779b8dedc67c9b531",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "5420eebf3b3c162bfaf965f30e61cd1d689e5732",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            },
            {
              "lessThan": "d6ab440240a04b8737ee4c7bb21af9182e451733",
              "status": "affected",
              "version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_resp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Copy WQE to local buffer in non-SRQ receive path\n\nFor non-SRQ QPs, the responder reads WQE fields directly from the\nshared queue buffer mapped into userspace. This allows a malicious\nuser to modify fields like num_sge or sge entries while the kernel\nis processing the WQE, leading to out-of-bounds reads in\nrxe_resp_check_length() and copy_data().\n\nIntroduce get_recv_wqe() that validates num_sge and copies the WQE\nto a kernel-local buffer before processing, matching the approach\nalready used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is\nreused since SRQ and non-SRQ paths are mutually exclusive per QP."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires mutating mmap\u0027d receive WQEs through /dev/infiniband/uverbs; inbound RoCE packets (rxe_udp_encap_recv\u2192rxe_rcv\u2192rxe_receiver) only trigger processing and cannot alter WQE fields without local control of the userspace-mapped receive queue.\nAC:L - The attacker controls both sides of the TOCTOU\u2014userspace threads racing num_sge/sge edits while posting recv WRs and driving inbound RoCE SEND/WRITE traffic\u2014so out-of-bounds reads in rxe_resp_check_length() and copy_data() are reliably triggerable with retries.\nPR:L - uverbs_devnode() publishes /dev/infiniband/uverbsN as mode 0666, letting any local account create userspace QPs and mmap receive queues; rxe link setup needs CAP_NET_ADMIN obtainable in a user+network namespace via unshare -Urn, matching PR:L kernel guidance.\nUI:N - Exploitation is entirely self-driven from the attacker\u0027s own RDMA verbs client and concurrent userspace threads; no victim user action, mount, or file open is required.\nS:U - Impact is kernel memory corruption and local privilege escalation within the host kernel security authority, not a VM guest-to-host escape, IOMMU/DMA boundary bypass, or other cross-scope compromise.\nC:H - Inflating num_sge or rewriting sge entries during processing causes out-of-bounds reads in rxe_resp_check_length() and copy_data() beyond the allocated WQE slot, potentially into adjacent vmalloc/kernel memory, enabling arbitrary kernel information disclosure.\nI:H - copy_data() walks attacker-forged out-of-bounds sge entries and performs rxe_mr_copy writes of incoming RDMA payload into MR-backed memory; combined with queue overruns this yields controlled memory corruption exploitable for arbitrary write and code execution.\nA:H - Processing a WQE with an attacker-inflated num_sge causes the kernel to walk far past valid sge slots, dereferencing invalid pointers and corrupting memory, reliably producing kernel oops/panic and total loss of availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:46:29.745Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2e60378fb3c8b51c94103bb40014c4fe38fa5033"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78"
        },
        {
          "url": "https://git.kernel.org/stable/c/9fa785137303f7109c23dea779b8dedc67c9b531"
        },
        {
          "url": "https://git.kernel.org/stable/c/5420eebf3b3c162bfaf965f30e61cd1d689e5732"
        },
        {
          "url": "https://git.kernel.org/stable/c/a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6ab440240a04b8737ee4c7bb21af9182e451733"
        }
      ],
      "title": "RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74377",
    "datePublished": "2026-08-15T05:58:55.704Z",
    "dateReserved": "2026-08-15T05:44:03.889Z",
    "dateUpdated": "2026-08-17T05:46:29.745Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74377",
      "date": "2026-09-04",
      "epss": "0.00129",
      "percentile": "0.02872"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74377\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:39.487\",\"lastModified\":\"2026-08-17T06:19:32.500\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRDMA/rxe: Copy WQE to local buffer in non-SRQ receive path\\n\\nFor non-SRQ QPs, the responder reads WQE fields directly from the\\nshared queue buffer mapped into userspace. This allows a malicious\\nuser to modify fields like num_sge or sge entries while the kernel\\nis processing the WQE, leading to out-of-bounds reads in\\nrxe_resp_check_length() and copy_data().\\n\\nIntroduce get_recv_wqe() that validates num_sge and copies the WQE\\nto a kernel-local buffer before processing, matching the approach\\nalready used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is\\nreused since SRQ and non-SRQ paths are mutually exclusive per QP.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/infiniband/sw/rxe/rxe_resp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8700e3e7c4857d28ebaa824509934556da0b3e76\",\"lessThan\":\"2e60378fb3c8b51c94103bb40014c4fe38fa5033\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8700e3e7c4857d28ebaa824509934556da0b3e76\",\"lessThan\":\"fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8700e3e7c4857d28ebaa824509934556da0b3e76\",\"lessThan\":\"9fa785137303f7109c23dea779b8dedc67c9b531\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8700e3e7c4857d28ebaa824509934556da0b3e76\",\"lessThan\":\"5420eebf3b3c162bfaf965f30e61cd1d689e5732\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8700e3e7c4857d28ebaa824509934556da0b3e76\",\"lessThan\":\"a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8700e3e7c4857d28ebaa824509934556da0b3e76\",\"lessThan\":\"d6ab440240a04b8737ee4c7bb21af9182e451733\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/infiniband/sw/rxe/rxe_resp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2e60378fb3c8b51c94103bb40014c4fe38fa5033\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5420eebf3b3c162bfaf965f30e61cd1d689e5732\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9fa785137303f7109c23dea779b8dedc67c9b531\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d6ab440240a04b8737ee4c7bb21af9182e451733\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T20:53:30+00:00",
      "cve": "CVE-2026-74377",
      "id": "CVE-2026-74377",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74377.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.