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)
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          "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."
        }
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            "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"
          },
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              "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."
            }
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    "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"
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      "date": "2026-09-21",
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            "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."
          }
        ],
        "id": "CVE-2026-74377",
        "lastModified": "2026-08-17T06:19:32.500",
        "metrics": {
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
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      "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"
    },
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      "current_release_date": "2026-09-15T01:22:01Z",
      "cve": "CVE-2026-74377",
      "id": "CVE-2026-74377",
      "initial_release_date": "2026-09-03T00:06:42Z",
      "product_status:first_fixed": "123",
      "product_status:known_affected": "358",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74377",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74377.json",
      "version": "4"
    }
  }
}



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