{"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<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."}],"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"}}}}