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Vulnerability record · CVE-2026-64053 · published 19 July 2026

CVE-2026-64053: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9%
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
2 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7 Patch
https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6 Patch
https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140 Patch
https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64053), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.