{"id":"CVE-2026-64052","summary":"block: bio-integrity: Fix null-ptr-deref in bio_integrity_map_user()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: bio-integrity: Fix null-ptr-deref in bio_integrity_map_user()\n\npin_user_pages_fast() can partially succeed and return the number of\npages that were actually pinned. However, the bio_integrity_map_user()\ndoes not handle this partial pinning. This leads to a general protection\nfault since bvec_from_pages() dereferences an unpinned page address,\nwhich is 0.\n\nTo fix this, add a check to verify that all requested memory is pinned.\nIf partial pinning occurs, unpin the memory and return -EFAULT.\n\nKernel Oops:\n\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\nCPU: 0 UID: 0 PID: 1061 Comm: nvme-passthroug Not tainted 7.0.0-11783-g90957f9314e8-dirty #16 PREEMPT(lazy)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\nRIP: 0010:bio_integrity_map_user.cold+0x1b0/0x9d6","modified":"2026-07-21T03:47:52.147324712Z","published":"2026-07-19T15:39:35.223Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64052.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/76410790f1491c8e06a451045ae223a61c652455"},{"type":"WEB","url":"https://git.kernel.org/stable/c/77c059f41e9395793917d067476f549a911d77d3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8582792cf23b3d94674d4d838f7cde9a28d0fcaf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8fa244738641d95ea4d70e6f9a62778bba42a5b7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64052.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64052"},{"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":"492c5d455969fc2e829f26ed4c83487b068f0dd7"},{"fixed":"77c059f41e9395793917d067476f549a911d77d3"},{"fixed":"76410790f1491c8e06a451045ae223a61c652455"},{"fixed":"8fa244738641d95ea4d70e6f9a62778bba42a5b7"},{"fixed":"8582792cf23b3d94674d4d838f7cde9a28d0fcaf"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64052.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.8.0"},{"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/cve-osv-conversion/osv-output/CVE-2026-64052.json"}}],"schema_version":"1.7.5"}