CVE-2026-64232 is a vulnerability in Linux Kernel
Published on July 24, 2026
block: recompute nr_integrity_segments in blk_insert_cloned_request
In the Linux kernel, the following vulnerability has been resolved:
block: recompute nr_integrity_segments in blk_insert_cloned_request
blk_insert_cloned_request() already recomputes nr_phys_segments
against the bottom queue, because "the queue settings related to
segment counting may differ from the original queue." The exact same
reasoning applies to integrity segments: a stacked driver's underlying
queue can have tighter virt_boundary_mask, seg_boundary_mask, or
max_segment_size than the top queue, in which case
blk_rq_count_integrity_sg() against the bottom queue produces a
different count than the cached rq->nr_integrity_segments inherited
from the source request by blk_rq_prep_clone().
When the cached count is lower than the bottom queue's actual count,
blk_rq_map_integrity_sg() trips
BUG_ON(segments > rq->nr_integrity_segments);
on dispatch. The same families of stacked setups that motivated the
existing nr_phys_segments recompute -- dm-multipath fanning out to
nvme-rdma in particular -- can produce this.
Mirror the nr_phys_segments handling: when the request carries
integrity, recompute nr_integrity_segments against the bottom queue
and reject the request if it exceeds the bottom queue's
max_integrity_segments. blk_rq_count_integrity_sg() and
queue_max_integrity_segments() are both already available via
<linux/blk-integrity.h>, which blk-mq.c includes.
This closes a latent gap in the stacking contract and brings the
integrity-segment accounting in line with the existing
phys-segment accounting.
Products Associated with CVE-2026-64232
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Affected Versions
Linux:- Version 76c313f658d2752e8527610677164aa7094ef7a5 and below 53a01bcc0242590eda4c452a5bd996f62457113b is affected.
- Version 76c313f658d2752e8527610677164aa7094ef7a5 and below 0943f81e1b3176f27dbaf6db268fc69d8a94f0ba is affected.
- Version 76c313f658d2752e8527610677164aa7094ef7a5 and below 42929c98d044f126508baf54a65b0f87f932fa75 is affected.
- Version 76c313f658d2752e8527610677164aa7094ef7a5 and below 2c6e6a18a37b905cb584eb0dda3ae482162a81ca is affected.
- Version 6.12 is affected.
- Before 6.12 is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.