{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64232", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.771Z", "datePublished": "2026-07-24T15:23:13.729Z", "dateUpdated": "2026-08-05T12:40:12.752Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:40:12.752Z" }, "descriptions": [ { "lang": "en", "value": "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, 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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "block/blk-mq.c" ], "versions": [ { "version": "76c313f658d2752e8527610677164aa7094ef7a5", "lessThan": "53a01bcc0242590eda4c452a5bd996f62457113b", "status": "affected", "versionType": "git" }, { "version": "76c313f658d2752e8527610677164aa7094ef7a5", "lessThan": "0943f81e1b3176f27dbaf6db268fc69d8a94f0ba", "status": "affected", "versionType": "git" }, { "version": "76c313f658d2752e8527610677164aa7094ef7a5", "lessThan": "42929c98d044f126508baf54a65b0f87f932fa75", "status": "affected", "versionType": "git" }, { "version": "76c313f658d2752e8527610677164aa7094ef7a5", "lessThan": "2c6e6a18a37b905cb584eb0dda3ae482162a81ca", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "block/blk-mq.c" ], "versions": [ { "version": "6.12", "status": "affected" }, { "version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/53a01bcc0242590eda4c452a5bd996f62457113b" }, { "url": "https://git.kernel.org/stable/c/0943f81e1b3176f27dbaf6db268fc69d8a94f0ba" }, { "url": "https://git.kernel.org/stable/c/42929c98d044f126508baf54a65b0f87f932fa75" }, { "url": "https://git.kernel.org/stable/c/2c6e6a18a37b905cb584eb0dda3ae482162a81ca" } ], "title": "block: recompute nr_integrity_segments in blk_insert_cloned_request", "x_generator": { "engine": "bippy-1.2.0" } } } }