CVE-2026-68478

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68478", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.397Z", "datePublished": "2026-08-15T05:51:33.441Z", "dateUpdated": "2026-08-17T05:06:21.136Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:06:21.136Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: ms_block: reject a card that reports too many blocks\n\nmsb_ftl_initialize() computes the zone count from the card block count\nwith no bound:\n\n\tmsb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE;\n\t...\n\tfor (i = 0; i < msb->zone_count; i++)\n\t\tmsb->free_block_count[i] = MS_BLOCKS_IN_ZONE;\n\nmsb->block_count is a card value. msb_read_boot_blocks() reads\nnumber_of_blocks from the card boot page and byte swaps it.\nfree_block_count is a fixed int[MS_MAX_ZONES]. MS_MAX_ZONES is 16, so the\nvalid indices are 0 to 15. The init loop above indexes it by zone_count.\nmsb_mark_block_used() and msb_mark_block_unused() index it by\npba / MS_BLOCKS_IN_ZONE, for pba up to block_count - 1. A card may report\nup to 65535 blocks. A block_count above 8192 (MS_MAX_ZONES *\nMS_BLOCKS_IN_ZONE) lets the pba index reach 16. That writes past\nfree_block_count[] and corrupts struct msb_data. A larger count runs the\ninit loop past the end too.\n\nA real Memory Stick has at most 16 zones. So it has at most 8192 blocks.\nmsb_ftl_initialize() now rejects a card that reports more than\nMS_MAX_ZONES * MS_BLOCKS_IN_ZONE blocks."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/memstick/core/ms_block.c"], "versions": [{"version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "lessThan": "a4b9961efe8640f50800811b4a2b2046b3dc2ccc", "status": "affected", "versionType": "git"}, {"version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "lessThan": "8937b11f1c3896e066c3fb07387ba17bc8c50b8a", "status": "affected", "versionType": "git"}, {"version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "lessThan": "f1c675ecf6e5ad02722f0019f729d8bb588d502e", "status": "affected", "versionType": "git"}, {"version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "lessThan": "d5db3439ee8d1c165a09a47e984c4ba508c130df", "status": "affected", "versionType": "git"}, {"version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "lessThan": "b86666ac4009a252501cc17242582a7ec9ed976e", "status": "affected", "versionType": "git"}, {"version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "lessThan": "39151f0708c84221e94cdd6aa070aba5d7cb1c01", "status": "affected", "versionType": "git"}, {"version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "lessThan": "47f0c7d856c67c9935546d2644f18c0d0131b449", "status": "affected", "versionType": "git"}, {"version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "lessThan": "718178f524b98bc920d74bc771aed823c8b81425", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/memstick/core/ms_block.c"], "versions": [{"version": "3.12", "status": "affected"}, {"version": "0", "lessThan": "3.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a4b9961efe8640f50800811b4a2b2046b3dc2ccc"}, {"url": "https://git.kernel.org/stable/c/8937b11f1c3896e066c3fb07387ba17bc8c50b8a"}, {"url": "https://git.kernel.org/stable/c/f1c675ecf6e5ad02722f0019f729d8bb588d502e"}, {"url": "https://git.kernel.org/stable/c/d5db3439ee8d1c165a09a47e984c4ba508c130df"}, {"url": "https://git.kernel.org/stable/c/b86666ac4009a252501cc17242582a7ec9ed976e"}, {"url": "https://git.kernel.org/stable/c/39151f0708c84221e94cdd6aa070aba5d7cb1c01"}, {"url": "https://git.kernel.org/stable/c/47f0c7d856c67c9935546d2644f18c0d0131b449"}, {"url": "https://git.kernel.org/stable/c/718178f524b98bc920d74bc771aed823c8b81425"}], "title": "memstick: ms_block: reject a card that reports too many blocks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/memstick/core/ms_block.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a4b9961efe8640f50800811b4a2b2046b3dc2ccc", "status": "affected", "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "versionType": "git"}, {"lessThan": "8937b11f1c3896e066c3fb07387ba17bc8c50b8a", "status": "affected", "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "versionType": "git"}, {"lessThan": "f1c675ecf6e5ad02722f0019f729d8bb588d502e", "status": "affected", "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "versionType": "git"}, {"lessThan": "d5db3439ee8d1c165a09a47e984c4ba508c130df", "status": "affected", "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "versionType": "git"}, {"lessThan": "b86666ac4009a252501cc17242582a7ec9ed976e", "status": "affected", "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "versionType": "git"}, {"lessThan": "39151f0708c84221e94cdd6aa070aba5d7cb1c01", "status": "affected", "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "versionType": "git"}, {"lessThan": "47f0c7d856c67c9935546d2644f18c0d0131b449", "status": "affected", "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "versionType": "git"}, {"lessThan": "718178f524b98bc920d74bc771aed823c8b81425", "status": "affected", "version": "0ab30494bc4f3bc1ea4659b7c5d97c5218554a63", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/memstick/core/ms_block.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.12"}, {"lessThan": "3.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: ms_block: reject a card that reports too many blocks\n\nmsb_ftl_initialize() computes the zone count from the card block count\nwith no bound:\n\n\tmsb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE;\n\t...\n\tfor (i = 0; i < msb->zone_count; i++)\n\t\tmsb->free_block_count[i] = MS_BLOCKS_IN_ZONE;\n\nmsb->block_count is a card value. msb_read_boot_blocks() reads\nnumber_of_blocks from the card boot page and byte swaps it.\nfree_block_count is a fixed int[MS_MAX_ZONES]. MS_MAX_ZONES is 16, so the\nvalid indices are 0 to 15. The init loop above indexes it by zone_count.\nmsb_mark_block_used() and msb_mark_block_unused() index it by\npba / MS_BLOCKS_IN_ZONE, for pba up to block_count - 1. A card may report\nup to 65535 blocks. A block_count above 8192 (MS_MAX_ZONES *\nMS_BLOCKS_IN_ZONE) lets the pba index reach 16. That writes past\nfree_block_count[] and corrupts struct msb_data. A larger count runs the\ninit loop past the end too.\n\nA real Memory Stick has at most 16 zones. So it has at most 8192 blocks.\nmsb_ftl_initialize() now rejects a card that reports more than\nMS_MAX_ZONES * MS_BLOCKS_IN_ZONE blocks."}], "id": "CVE-2026-68478", "lastModified": "2026-08-17T06:17:57.333", "metrics": {}, "published": "2026-08-15T06:20:47.573", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/39151f0708c84221e94cdd6aa070aba5d7cb1c01"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/47f0c7d856c67c9935546d2644f18c0d0131b449"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/718178f524b98bc920d74bc771aed823c8b81425"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8937b11f1c3896e066c3fb07387ba17bc8c50b8a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a4b9961efe8640f50800811b4a2b2046b3dc2ccc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b86666ac4009a252501cc17242582a7ec9ed976e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d5db3439ee8d1c165a09a47e984c4ba508c130df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f1c675ecf6e5ad02722f0019f729d8bb588d502e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: memstick: ms_block: reject a card that reports too many blocks", "id": "2516732", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516732"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's Memory Stick block driver (`memstick: ms_block`). A malicious Memory Stick card, crafted to report an excessive number of blocks, can cause the driver to write beyond the bounds of an allocated memory structure. This out-of-bounds write can lead to memory corruption within the kernel, potentially resulting in a system crash or other unpredictable behavior."], "name": "CVE-2026-68478", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68478\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68478\nhttps://lore.kernel.org/linux-cve-announce/2026081506-CVE-2026-68478-8b6c@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ab30494bc4f3bc1ea4659b7c5d97c5218554a63,a4b9961efe8640f50800811b4a2b2046b3dc2ccc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ab30494bc4f3bc1ea4659b7c5d97c5218554a63,8937b11f1c3896e066c3fb07387ba17bc8c50b8a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ab30494bc4f3bc1ea4659b7c5d97c5218554a63,f1c675ecf6e5ad02722f0019f729d8bb588d502e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ab30494bc4f3bc1ea4659b7c5d97c5218554a63,d5db3439ee8d1c165a09a47e984c4ba508c130df)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ab30494bc4f3bc1ea4659b7c5d97c5218554a63,b86666ac4009a252501cc17242582a7ec9ed976e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ab30494bc4f3bc1ea4659b7c5d97c5218554a63,39151f0708c84221e94cdd6aa070aba5d7cb1c01)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ab30494bc4f3bc1ea4659b7c5d97c5218554a63,47f0c7d856c67c9935546d2644f18c0d0131b449)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0ab30494bc4f3bc1ea4659b7c5d97c5218554a63,718178f524b98bc920d74bc771aed823c8b81425)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.261,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.212,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T08:15:04.225451+00:00", "updated": "2026-08-18T05:30:08.330308+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}