{"id":"CVE-2026-64232","revision":"b9240015d5d44ca3afea08b65540d7a1","records":[{"revision":"b9240015d5d44ca3afea08b65540d7a1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64232","aliases":[],"title":"block: recompute nr_integrity_segments in blk_insert_cloned_request","description":"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.","state":0,"publishedAt":"2026-07-24T15:23:13.729+00:00","modifiedAt":"2026-10-19T20:28:16.033+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"block/blk-mq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"76c313f658d2752e8527610677164aa7094ef7a5\",\n                            \"lessThan\": \"53a01bcc0242590eda4c452a5bd996f62457113b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"76c313f658d2752e8527610677164aa7094ef7a5\",\n                            \"lessThan\": \"0943f81e1b3176f27dbaf6db268fc69d8a94f0ba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"76c313f658d2752e8527610677164aa7094ef7a5\",\n                            \"lessThan\": \"42929c98d044f126508baf54a65b0f87f932fa75\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"76c313f658d2752e8527610677164aa7094ef7a5\",\n                            \"lessThan\": \"2c6e6a18a37b905cb584eb0dda3ae482162a81ca\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"block/blk-mq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.92\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.34\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.11\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/53a01bcc0242590eda4c452a5bd996f62457113b","https://git.kernel.org/stable/c/0943f81e1b3176f27dbaf6db268fc69d8a94f0ba","https://git.kernel.org/stable/c/42929c98d044f126508baf54a65b0f87f932fa75","https://git.kernel.org/stable/c/2c6e6a18a37b905cb584eb0dda3ae482162a81ca"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64232","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64232","identifiers":["CVE-2026-64232"]},"retained":false,"historicalAffected":[]}],"coverage":[]}