High 7.8Published Jul 19, 2026

CVE-2026-64053block: don't overwrite bip_vcnt in bio_integrity_copy_user()

Updated under an hour ago (Oct 26, 2026, 1:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 3991657ae7074c3c497bf095093178bed37ea1b4 before d18160c9525c63c203656fefd847e94b538cd4a4; 3991657ae7074c3c497bf095093178bed37ea1b4 builds before 0d48654af4d1390c888389206cc13b51b82c30e6; 3991657ae7074c3c497bf095093178bed37ea1b4 builds before 066be1439593a381b1a29663becfcfe0c92363e7; 3991657ae7074c3c497bf095093178bed37ea1b4 builds before 637ad3a56a3b889527d1dacea6fea2a8bd648140	CNA record
linux linux_kernel linux:linux_kernel	from 6.11 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.