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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 3991657ae7074c3c497bf095093178bed37ea1b4, < d18160c9525c63c203656fefd847e94b538cd4a4; >= 3991657ae7074c3c497bf095093178bed37ea1b4, < 0d48654af4d1390c888389206cc13b51b82c30e6; >= 3991657ae7074c3c497bf095093178bed37ea1b4, < 066be1439593a381b1a29663becfcfe0c92363e7; >= 3991657ae7074c3c497bf095093178bed37ea1b4, < 637ad3a56a3b889527d1dacea6fea2a8bd648140 |
| Linux | Linux | 6.11 |
References
- https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7Patch
- https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6Patch
- https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140Patch
- https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4Patch
Timeline
- Published
- Jul 19, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Modified