CVE-2026-68419 (GCVE-0-2026-68419)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:05
VLAI
Title
RDMA/irdma: Prevent rereg_mr for non-mem regions
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Prevent rereg_mr for non-mem regions When a QP/CQ/SRQ is created, a two step process is used where the buffer is allocated in userspace and explicitly registered with the normal reg_mr mechanism prior to creating the actual QP/CQ/SRQ object. These special registrations are indicated via an ABI field so the driver knows that they do not have a valid mkey and to skip the actual CQP command submission. Since these are real MR objects from the core's perspective, it is possible for a user application to invoke rereg_mr on them and cause a real CQP op to be emitted with the zero-initialized mkey value of 0. Fix this by preventing rereg_mr on these special regions.
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: 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 , < fb46d134e1b8690bed2da9005b36d32d2efd34ac (git)
Affected: 5ac388db27c443dadfbb0b8b23fa7ccf429d901a , < b5029e91c63406e4f4c8d58161048b41b6f0bd8c (git)
Affected: 5ac388db27c443dadfbb0b8b23fa7ccf429d901a , < ca1c29f05274b737dc964e28b97803750d7cf7ec (git)
Affected: 5ac388db27c443dadfbb0b8b23fa7ccf429d901a , < dbaa37e060918c45517786e37ecab0f300b48fa9 (git)
Affected: 5ac388db27c443dadfbb0b8b23fa7ccf429d901a , < a846aecb931b4d65d5eafa92a0623545af46d4f2 (git)
Affected: 6.6.120 , < 6.6.148 (semver)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 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/irdma: Prevent rereg_mr for non-mem regions\n\nWhen a QP/CQ/SRQ is created, a two step process is used\nwhere the buffer is allocated in userspace and explicitly\nregistered with the normal reg_mr mechanism prior to creating\nthe actual QP/CQ/SRQ object.\n\nThese special registrations are indicated via an ABI field\nso the driver knows that they do not have a valid mkey and\nto skip the actual CQP command submission.\n\nSince these are real MR objects from the core\u0027s perspective,\nit is possible for a user application to invoke rereg_mr on them\nand cause a real CQP op to be emitted with the zero-initialized\nmkey value of 0.\n\nFix this by preventing rereg_mr on these special regions."
        }
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              "value": "AV:L - The vulnerability is reached through the ib_uverbs REREG_MR command on /dev/infiniband/uverbs*, a local character device; no network input reaches irdma_rereg_user_mr(). The resulting corrupt hardware STAG can later be abused over RDMA, but initial access is local.\nAC:L - The attacker fully controls every precondition: register a buffer with reg_type IRDMA_MEMREG_TYPE_QP/CQ/SRQ, then call rereg_mr on that handle. There is no race, no timing dependency and no reliance on memory layout the attacker cannot influence.\nPR:L - Only an open file descriptor on /dev/infiniband/uverbsN is needed; rdma-core udev rules ship these nodes world-accessible (0666) and they are routinely exposed to containers. ib_uverbs_rereg_mr() performs no capability check, only uobject ownership of the caller\u0027s own MR.\nUI:N - The attacker performs the entire sequence (reg_mr with a non-MEM reg_type, then rereg_mr) from its own process. No action by any other user or administrator is required.\nS:U - The corruption stays within the kernel/RDMA-device security authority managed by the same OS instance; there is no VM, IOMMU or hypervisor boundary crossed by the erroneous CQP command.\nC:H - Programming HW STAG index 0 with attacker-chosen remote-read rights, combined with dereg_mr never invalidating it, leaves a live hardware mapping over PBLEs and umem pages that are freed and reused, giving RDMA-read access to recycled kernel/other-process memory; it can also collide with another process\u0027s MR at stag index 0.\nI:H - The same stale/hijacked STAG can carry IB_ACCESS_REMOTE_WRITE, and the IB_MR_REREG_TRANS path frees the PBLEs and releases the umem of a live QP/CQ/SRQ while hardware keeps DMAing into those pages, yielding device-driven writes into freed and reallocated kernel memory.\nA:H - Issuing a CQP op with a zero mkey corrupts device state and can fail the CQP op, triggering the driver\u0027s reset path; the DMA-after-free into recycled pages and the clobbering of another region\u0027s STAG readily produce kernel memory corruption, oops or full RDMA device reset."
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    "dateReserved": "2026-07-30T09:28:09.391Z",
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    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Prevent rereg_mr for non-mem regions\n\nWhen a QP/CQ/SRQ is created, a two step process is used\nwhere the buffer is allocated in userspace and explicitly\nregistered with the normal reg_mr mechanism prior to creating\nthe actual QP/CQ/SRQ object.\n\nThese special registrations are indicated via an ABI field\nso the driver knows that they do not have a valid mkey and\nto skip the actual CQP command submission.\n\nSince these are real MR objects from the core\u0027s perspective,\nit is possible for a user application to invoke rereg_mr on them\nand cause a real CQP op to be emitted with the zero-initialized\nmkey value of 0.\n\nFix this by preventing rereg_mr on these special regions."
          }
        ],
        "id": "CVE-2026-68419",
        "lastModified": "2026-08-17T06:17:50.893",
        "metrics": {
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                "integrityImpact": "HIGH",
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                "scope": "UNCHANGED",
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    "redhat_vex": {
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      "current_release_date": "2026-08-13T23:28:27+00:00",
      "cve": "CVE-2026-68419",
      "id": "CVE-2026-68419",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/irdma: Prevent rereg_mr for non-mem regions",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68419.json",
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      "cve": "CVE-2026-68419",
      "id": "CVE-2026-68419",
      "initial_release_date": "2026-08-11T23:45:54Z",
      "product_status:first_fixed": "60",
      "product_status:known_affected": "480",
      "product_status:known_not_affected": "251",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68419",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68419.json",
      "version": "10"
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}



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