CVE-2026-64053
block: don't overwrite bip_vcnt in bio_integrity_copy_user()
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 19, 2026 |
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Affected Versions
Linux / Linux
3991657ae7074c3c497bf095093178bed37ea1b4 < d18160c9525c63c203656fefd847e94b538cd4a4 3991657ae7074c3c497bf095093178bed37ea1b4 < 0d48654af4d1390c888389206cc13b51b82c30e6 3991657ae7074c3c497bf095093178bed37ea1b4 < 066be1439593a381b1a29663becfcfe0c92363e7 3991657ae7074c3c497bf095093178bed37ea1b4 < 637ad3a56a3b889527d1dacea6fea2a8bd648140
Linux / Linux
6.11
References
git.kernel.org: https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4 git.kernel.org: https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6 git.kernel.org: https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7 git.kernel.org: https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140