CVE-2026-64053 | In the Linux kernel, the following vulnerability has been re…

Description

In the Linux kernel, the following vulnerability has been resolved: block: don't overwrite bip_vcnt in bio_integrity_copy_user() bio_integrity_add_page() already sets bip_vcnt to 1 for the bounce segment. Overwriting it with nr_vecs breaks bip_vcnt <= bip_max_vcnt on WRITE (bip_max_vcnt is 1), so the gap-merge checks in block/blk.h read past the bip_vec[] flex array. On READ the read is in bounds but lands on a saved user bvec instead of the bounce. The line was added for split propagation, but bio_integrity_clone() doesn't copy bip_vcnt and BIP_CLONE_FLAGS excludes BIP_COPY_USER.

Metadata

CVE ID: CVE-2026-64053
State: PUBLISHED
Assigner: Linux
Reserved: 2026-07-19 07:54 UTC
Published: 2026-07-19 15:39 UTC
Last updated: 2026-07-19 15:39 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

No CVSS data available.

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	3991657ae7074c3c497bf095093178bed37ea1b4 < d18160c9525c63c203656fefd847e94b538cd4a4, 3991657ae7074c3c497bf095093178bed37ea1b4 < 0d48654af4d1390c888389206cc13b51b82c30e6, 3991657ae7074c3c497bf095093178bed37ea1b4 < 066be1439593a381b1a29663becfcfe0c92363e7, 3991657ae7074c3c497bf095093178bed37ea1b4 < 637ad3a56a3b889527d1dacea6fea2a8bd648140
Linux	Linux	—	6.11, 0 < 6.11, 6.12.92 ≤ 6.12., 6.18.34 ≤ 6.18. …

References (4)