CVE-2026-64053High· 7.8▾ TwilightIn 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 br…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
Last analysed / modified upstream
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.
Linux >= 3991657ae7074c3c497bf095093178bed37ea1b4 < d18160c9525c63c203656fefd847e94b538cd4a4Linux >= 3991657ae7074c3c497bf095093178bed37ea1b4 < 0d48654af4d1390c888389206cc13b51b82c30e6Linux >= 3991657ae7074c3c497bf095093178bed37ea1b4 < 066be1439593a381b1a29663becfcfe0c92363e7Linux >= 3991657ae7074c3c497bf095093178bed37ea1b4 < 637ad3a56a3b889527d1dacea6fea2a8bd648140Linux 6.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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