{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64232",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64232"
  ],
  "published": "2026-07-24T15:23:26Z",
  "summary": "block: recompute nr_integrity_segments in blk_insert_cloned_request",
  "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->nr_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 > rq->nr_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<linux/blk-integrity.h>, 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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.92"
          },
          "1:6.12.75-1+rpt1": {
            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.92"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.34"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.34"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64232"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/53a01bcc0242590eda4c452a5bd996f62457113b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0943f81e1b3176f27dbaf6db268fc69d8a94f0ba"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/42929c98d044f126508baf54a65b0f87f932fa75"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2c6e6a18a37b905cb584eb0dda3ae482162a81ca"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - A PI-enabled iSER or NVMe/RDMA target can expose the affected request-based dm-multipath device, allowing remote storage commands to reach the vulnerable clone-dispatch path.\nAC:L - Once the affected storage topology is configured, the attacker controls the metadata-bearing I/O requests and can trigger the segment-count mismatch repeatedly without winning an uncontrollable race.\nPR:N - Targets configured with dynamic ACLs and authentication disabled, or NVMe allow_any_host, permit unauthenticated remote initiators to issue the required I/O.\nUI:N - No victim action is required after the network storage target and affected backend are operational.\nS:U - The corruption occurs within the host kernel processing the target's block I/O and does not inherently cross a separate security authority such as a guest-host boundary.\nC:H - The undersized integrity scatterlist is populated beyond its declared bounds before the BUG_ON executes, permitting adjacent kernel-memory corruption that could be leveraged for arbitrary kernel access and disclosure.\nI:H - The out-of-bounds scatterlist writes corrupt kernel memory and may permit control-flow hijacking or arbitrary modification if the attacker shapes the surrounding allocation state.\nA:H - The post-write BUG_ON reliably causes a kernel oops or panic, and malformed requests can be submitted repeatedly to disrupt the storage target."
    }
  }
}