{"id":"CVE-2026-64053","revision":"990e1d101f5e4a0b98654abfa2fd92db","records":[{"revision":"990e1d101f5e4a0b98654abfa2fd92db","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64053","aliases":[],"title":"block: don't overwrite bip_vcnt in bio_integrity_copy_user()","description":"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 <= 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.","state":0,"publishedAt":"2026-07-19T15:39:35.854+00:00","modifiedAt":"2026-10-19T20:28:10.989+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"block/bio-integrity.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3991657ae7074c3c497bf095093178bed37ea1b4\",\n                            \"lessThan\": \"d18160c9525c63c203656fefd847e94b538cd4a4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3991657ae7074c3c497bf095093178bed37ea1b4\",\n                            \"lessThan\": \"0d48654af4d1390c888389206cc13b51b82c30e6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3991657ae7074c3c497bf095093178bed37ea1b4\",\n                            \"lessThan\": \"066be1439593a381b1a29663becfcfe0c92363e7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3991657ae7074c3c497bf095093178bed37ea1b4\",\n                            \"lessThan\": \"637ad3a56a3b889527d1dacea6fea2a8bd648140\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"block/bio-integrity.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.92\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.34\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.11\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4","https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6","https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7","https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64053","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64053","identifiers":["CVE-2026-64053"]},"retained":false,"historicalAffected":[]}],"coverage":[]}