{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "76c313f658d2752e8527610677164aa7094ef7a5"
            },
            {
              "fixed": "53a01bcc0242590eda4c452a5bd996f62457113b"
            },
            {
              "fixed": "0943f81e1b3176f27dbaf6db268fc69d8a94f0ba"
            },
            {
              "fixed": "42929c98d044f126508baf54a65b0f87f932fa75"
            },
            {
              "fixed": "2c6e6a18a37b905cb584eb0dda3ae482162a81ca"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.12.0"
            },
            {
              "fixed": "6.12.92"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64232.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: recompute nr_integrity_segments in blk_insert_cloned_request\n\nblk_insert_cloned_request() already recomputes nr_phys_segments\nagainst the bottom queue, because \"the queue settings related to\nsegment counting may differ from the original queue.\" The exact same\nreasoning applies to integrity segments: a stacked driver's underlying\nqueue can have tighter virt_boundary_mask, seg_boundary_mask, or\nmax_segment_size than the top queue, in which case\nblk_rq_count_integrity_sg() against the bottom queue produces a\ndifferent count than the cached rq-\u003enr_integrity_segments inherited\nfrom the source request by blk_rq_prep_clone().\n\nWhen the cached count is lower than the bottom queue's actual count,\nblk_rq_map_integrity_sg() trips\n\n\tBUG_ON(segments \u003e rq-\u003enr_integrity_segments);\n\non dispatch. The same families of stacked setups that motivated the\nexisting nr_phys_segments recompute -- dm-multipath fanning out to\nnvme-rdma in particular -- can produce this.\n\nMirror the nr_phys_segments handling: when the request carries\nintegrity, recompute nr_integrity_segments against the bottom queue\nand reject the request if it exceeds the bottom queue's\nmax_integrity_segments. blk_rq_count_integrity_sg() and\nqueue_max_integrity_segments() are both already available via\n\u003clinux/blk-integrity.h\u003e, which blk-mq.c includes.\n\nThis closes a latent gap in the stacking contract and brings the\nintegrity-segment accounting in line with the existing\nphys-segment accounting.",
  "id": "CVE-2026-64232",
  "modified": "2026-07-28T03:56:00.514208625Z",
  "published": "2026-07-24T15:23:13.729Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0943f81e1b3176f27dbaf6db268fc69d8a94f0ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c6e6a18a37b905cb584eb0dda3ae482162a81ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42929c98d044f126508baf54a65b0f87f932fa75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53a01bcc0242590eda4c452a5bd996f62457113b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64232.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64232"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "block: recompute nr_integrity_segments in blk_insert_cloned_request"
}