CVE-2026-97421 (GCVE-0-2026-97421)
Vulnerability from cvelistv5
Published
2026-09-24 16:03
Modified
2026-10-03 10:58
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz() Several corner cases, especially important on 32 bits: - umem->iova is u64, the function argument should pass in u64 or iova will be truncated - Check that the length is not too large for the iova - Check that lengths > 4G don't overflow the GENMASK
References
Impacted products
Vendor Product Version
Linux Linux Version: a40c20dabdf9045270767c75918feb67f0727c89
Version: a40c20dabdf9045270767c75918feb67f0727c89
Version: a40c20dabdf9045270767c75918feb67f0727c89
Version: a40c20dabdf9045270767c75918feb67f0727c89
Version: a40c20dabdf9045270767c75918feb67f0727c89
Version: a40c20dabdf9045270767c75918feb67f0727c89
Version: 85e40ba1c4a5246b35e91c2ed69d4680426904d7
Version: 59f07434b297e2268f5d5c567db5b09145245cf1
Version: 488229b7729d7becf4c39c5e74fb709fb35115c2
Version: 5.4.73   ≤
Version: 5.8.17   ≤
Version: 5.9.2   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/umem.c",
            "include/rdma/ib_umem.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "a40c20dabdf9045270767c75918feb67f0727c89",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "a40c20dabdf9045270767c75918feb67f0727c89",
              "versionType": "git"
            },
            {
              "lessThan": "e9bbb5f5349ef560ff6f0395564f04c3aa664559",
              "status": "affected",
              "version": "a40c20dabdf9045270767c75918feb67f0727c89",
              "versionType": "git"
            },
            {
              "lessThan": "ae3cf7d2c4d506c5c91746321644e1a08d989e2a",
              "status": "affected",
              "version": "a40c20dabdf9045270767c75918feb67f0727c89",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "a40c20dabdf9045270767c75918feb67f0727c89",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "a40c20dabdf9045270767c75918feb67f0727c89",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "85e40ba1c4a5246b35e91c2ed69d4680426904d7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "59f07434b297e2268f5d5c567db5b09145245cf1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "488229b7729d7becf4c39c5e74fb709fb35115c2",
              "versionType": "git"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.73",
              "versionType": "semver"
            },
            {
              "lessThan": "5.9",
              "status": "affected",
              "version": "5.8.17",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10",
              "status": "affected",
              "version": "5.9.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/core/umem.c",
            "include/rdma/ib_umem.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "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": "5.15.222",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.73",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.8.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.9.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()\n\nSeveral corner cases, especially important on 32 bits:\n\n- umem-\u003eiova is u64, the function argument should pass in u64 or\n  iova will be truncated\n- Check that the length is not too large for the iova\n- Check that lengths \u003e 4G don\u0027t overflow the GENMASK"
        }
      ],
      "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 - Attacker-controlled cmd.hca_va and cmd.length reach ib_umem_find_best_pgsz() via open of /dev/infiniband/uverbsX, then ib_uverbs_write(IB_USER_VERBS_CMD_REG_MR)/ib_uverbs_reg_mr() or UVERBS_METHOD_REG_MR ioctl, then pd-\u003eops.reg_user_mr() (mlx5_ib_reg_user_mr/irdma_reg_user_mr/efa_register_mr). Remote RDMA packets do not supply virt or umem-\u003elength.\nAC:L - ib_uverbs_reg_mr() only requires (start \u0026 ~PAGE_MASK)==(hca_va \u0026 ~PAGE_MASK), so the attacker picks hca_va near 2^63 or U64_MAX with a small pinned region and makes (umem-\u003elength-1+virt) overflow or bits_per() return BITS_PER_LONG, hitting the unguarded GENMASK() deterministically with no race.\nPR:L - uverbs_devnode() creates /dev/infiniband/uverbs* mode 0666 and ib_uverbs_open() has no capability check (only rdma_dev_access_netns). ib_umem_get_va() needs can_do_mlock() (RLIMIT_MEMLOCK!=0) and ib_check_mr_access(); CAP_SYS_ADMIN/CAP_IPC_LOCK are not required.\nUI:N - After opening uverbs the attacker allocates a PD and issues IB_USER_VERBS_CMD_REG_MR or UVERBS_METHOD_REG_MR with their own start, length, and hca_va; no victim mount or other user action is required.\nS:U - A wrong page size or truncated umem-\u003eiova from ib_umem_find_best_pgsz() misprograms that host\u0027s RDMA MTT/PBL. This stays in the kernel/device memory-management authority and is not a KVM/Xen guest-to-host escape or IOMMU VM-boundary bypass.\nC:H - When bits_per((umem-\u003elength-1+virt)^virt)\u003e=BITS_PER_LONG, GENMASK(BITS_PER_LONG-1, bits) is invalid and mask can be 0, so the function returns rounddown_pow_of_two(pgsz_bitmap) (largest HW page). mlx5_ib_populate_pas()/rdma_umem_for_each_dma_block() then install oversized MTT/PBL entries, so the NIC DMA-reads physical memory beyond the pinned umem.\nI:H - The same oversized page size is programmed into hardware (efa_register_mr params.page_shift, ionic_pgtbl_init, mlx5 mkey PAS). With IB_ACCESS_LOCAL_WRITE or IB_ACCESS_REMOTE_WRITE from the REG_MR access_flags, the device DMA-writes outside the registered region, which is an arbitrary physical write.\nA:H - GENMASK() with l\u003eh is a shift UB that can oops (UBSAN) or yield mask==0; mis-sized pages cause IOMMU/device faults. ib_umem_is_contiguous() (mlx5_ib_db_map_user_desc, efa create_cq) can also treat a non-contiguous umem as one DMA block and fault the kernel or NIC."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:58:13.282Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3014da7587ce006cd08004fd6b257626b314e0a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/ddccf6cc3861de2fe60986933bead79220e0d797"
        },
        {
          "url": "https://git.kernel.org/stable/c/e9bbb5f5349ef560ff6f0395564f04c3aa664559"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae3cf7d2c4d506c5c91746321644e1a08d989e2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5fc5b73109540809b094710fac44da81dd8a3ff8"
        },
        {
          "url": "https://git.kernel.org/stable/c/09ea6837a0434fb4db99528a5055b6d822135dcf"
        }
      ],
      "title": "RDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97421",
    "datePublished": "2026-09-24T16:03:31.505Z",
    "dateReserved": "2026-09-24T14:53:16.868Z",
    "dateUpdated": "2026-10-03T10:58:13.282Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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