{"id":"CVE-2026-64053","summary":"block: don't overwrite bip_vcnt in bio_integrity_copy_user()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don't overwrite bip_vcnt in bio_integrity_copy_user()\n\nbio_integrity_add_page() already sets bip_vcnt to 1 for the bounce\nsegment. Overwriting it with nr_vecs breaks bip_vcnt \u003c= bip_max_vcnt\non WRITE (bip_max_vcnt is 1), so the gap-merge checks in block/blk.h\nread past the bip_vec[] flex array. On READ the read is in bounds\nbut lands on a saved user bvec instead of the bounce.\n\nThe line was added for split propagation, but bio_integrity_clone()\ndoesn't copy bip_vcnt and BIP_CLONE_FLAGS excludes BIP_COPY_USER.","modified":"2026-07-22T03:32:07.656265722Z","published":"2026-07-19T15:39:35.854Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64053.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64053.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64053"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3991657ae7074c3c497bf095093178bed37ea1b4"},{"fixed":"d18160c9525c63c203656fefd847e94b538cd4a4"},{"fixed":"0d48654af4d1390c888389206cc13b51b82c30e6"},{"fixed":"066be1439593a381b1a29663becfcfe0c92363e7"},{"fixed":"637ad3a56a3b889527d1dacea6fea2a8bd648140"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64053.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.11.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64053.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}