{"cvss":7.8,"datePublished":"2026-07-19T16:17:45.730","dateUpdated":"2026-09-02T21:09:42.357","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.","id":"CVE-2026-64053","raw":{"affected":[{"affectedData":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["block/bio-integrity.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d18160c9525c63c203656fefd847e94b538cd4a4","status":"affected","version":"3991657ae7074c3c497bf095093178bed37ea1b4","versionType":"git"},{"lessThan":"0d48654af4d1390c888389206cc13b51b82c30e6","status":"affected","version":"3991657ae7074c3c497bf095093178bed37ea1b4","versionType":"git"},{"lessThan":"066be1439593a381b1a29663becfcfe0c92363e7","status":"affected","version":"3991657ae7074c3c497bf095093178bed37ea1b4","versionType":"git"},{"lessThan":"637ad3a56a3b889527d1dacea6fea2a8bd648140","status":"affected","version":"3991657ae7074c3c497bf095093178bed37ea1b4","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["block/bio-integrity.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.11"},{"lessThan":"6.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.92","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","matchCriteriaId":"AFEC5E32-5D1A-40AF-B543-F621484B76AA","versionEndExcluding":"6.12.92","versionStartIncluding":"6.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","matchCriteriaId":"A4B1EF6D-18D7-4838-BC37-7499D5DCC3C0","versionEndExcluding":"6.18.34","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","matchCriteriaId":"0520D091-FC52-4A50-AF07-70AE7D08B750","versionEndExcluding":"7.0.11","versionStartIncluding":"6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*","matchCriteriaId":"B1EF7059-E670-45F4-B422-54C40FA86390","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*","matchCriteriaId":"0D38F0BF-A728-4133-A358-D44A2F7EE6D6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*","matchCriteriaId":"EC732D08-5F7B-46D9-B154-E60C7F4F0A97","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"id":"CVE-2026-64053","lastModified":"2026-09-02T21:09:42.357","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"exploitabilityScore":1.8,"impactScore":5.9,"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary"}]},"published":"2026-07-19T16:17:45.730","references":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/d18160c9525c63c203656fefd847e94b538cd4a4"}],"sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","vulnStatus":"Analyzed","weaknesses":[{"description":[{"lang":"en","value":"NVD-CWE-noinfo"}],"source":"nvd@nist.gov","type":"Primary"}]},"severity":"HIGH","source":"nvd","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don't overwrite bip_vcnt in bio_integrity..."}