{"id":"CVE-2026-64052","state":"PUBLISHED","title":"block: bio-integrity: Fix null-ptr-deref in bio_integrity_map_user()","description":"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","publishedAt":"2026-07-19T15:39:35.223Z","updatedAt":"2026-07-19T15:39:35.223Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"492c5d455969fc2e829f26ed4c83487b068f0dd7","status":"affected","lessThan":"77c059f41e9395793917d067476f549a911d77d3","versionType":"git"},{"version":"492c5d455969fc2e829f26ed4c83487b068f0dd7","status":"affected","lessThan":"76410790f1491c8e06a451045ae223a61c652455","versionType":"git"},{"version":"492c5d455969fc2e829f26ed4c83487b068f0dd7","status":"affected","lessThan":"8fa244738641d95ea4d70e6f9a62778bba42a5b7","versionType":"git"},{"version":"492c5d455969fc2e829f26ed4c83487b068f0dd7","status":"affected","lessThan":"8582792cf23b3d94674d4d838f7cde9a28d0fcaf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/bio-integrity.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.92","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/bio-integrity.c"]}],"references":["https://git.kernel.org/stable/c/77c059f41e9395793917d067476f549a911d77d3","https://git.kernel.org/stable/c/76410790f1491c8e06a451045ae223a61c652455","https://git.kernel.org/stable/c/8fa244738641d95ea4d70e6f9a62778bba42a5b7","https://git.kernel.org/stable/c/8582792cf23b3d94674d4d838f7cde9a28d0fcaf"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64052.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64052","state":"PUBLISHED","datePublished":"2026-07-19T15:39:35.223Z","dateUpdated":"2026-07-19T15:39:35.223Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.029Z"},"containers":{"cna":{"title":"block: bio-integrity: Fix null-ptr-deref in bio_integrity_map_user()","descriptions":[{"lang":"en","value":"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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"492c5d455969fc2e829f26ed4c83487b068f0dd7","status":"affected","lessThan":"77c059f41e9395793917d067476f549a911d77d3","versionType":"git"},{"version":"492c5d455969fc2e829f26ed4c83487b068f0dd7","status":"affected","lessThan":"76410790f1491c8e06a451045ae223a61c652455","versionType":"git"},{"version":"492c5d455969fc2e829f26ed4c83487b068f0dd7","status":"affected","lessThan":"8fa244738641d95ea4d70e6f9a62778bba42a5b7","versionType":"git"},{"version":"492c5d455969fc2e829f26ed4c83487b068f0dd7","status":"affected","lessThan":"8582792cf23b3d94674d4d838f7cde9a28d0fcaf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/bio-integrity.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.8","versionType":"semver"},{"version":"6.12.92","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/bio-integrity.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/77c059f41e9395793917d067476f549a911d77d3"},{"url":"https://git.kernel.org/stable/c/76410790f1491c8e06a451045ae223a61c652455"},{"url":"https://git.kernel.org/stable/c/8fa244738641d95ea4d70e6f9a62778bba42a5b7"},{"url":"https://git.kernel.org/stable/c/8582792cf23b3d94674d4d838f7cde9a28d0fcaf"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T15:39:35.223Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.12.92"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}