{"api_version":"1","generated_at":"2026-08-24T11:05:08+00:00","cve":"CVE-2026-72369","urls":{"html":"https://cve.report/CVE-2026-72369","api":"https://cve.report/api/cve/CVE-2026-72369.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72369","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72369"},"summary":{"title":"minix: avoid overflow in bitmap block count calculation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nminix: avoid overflow in bitmap block count calculation\n\nminix_check_superblock() uses minix_blocks_needed() to verify that the\non-disk imap and zmap block counts are large enough for the advertised\ninode and zone counts.\n\nThe helper currently performs DIV_ROUND_UP() in unsigned int arithmetic.\nA Minix v3 image can set s_ninodes or s_zones near UINT_MAX so the\naddition inside DIV_ROUND_UP() wraps to zero. That makes a zero imap/zmap\nblock count look valid, after which minix_fill_super() can dereference\ns_imap[0] or s_zmap[0] even though no bitmap buffers were allocated.\n\nImpact: mounting a crafted Minix v3 image whose s_ninodes or s_zones is\nnear UINT_MAX makes minix_check_superblock() accept a zero bitmap-block\ncount and minix_fill_super() dereference s_imap[0]/s_zmap[0], panicking\nthe kernel.\n\nThe divisor is the bitmap capacity in bits, blocksize * 8, which is\nalways a power of two: minix_fill_super() obtains the block size through\nsb_set_blocksize(), and blk_validate_block_size() rejects any size that\nis not a power of two. Use DIV_ROUND_UP_POW2(), which divides before\nadding the round-up term and so cannot overflow for a power-of-two\ndivisor.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:10","updated_at":"2026-08-17 06:18:41"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/a11ebaab50d27d6c4c78506f84ff36452e0b901d","name":"https://git.kernel.org/stable/c/a11ebaab50d27d6c4c78506f84ff36452e0b901d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/959c95340a9e19cd333b4c18935fdeecbb2f319d","name":"https://git.kernel.org/stable/c/959c95340a9e19cd333b4c18935fdeecbb2f319d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb3e566cafc38fe3ba35e6843a2d529a3748870c","name":"https://git.kernel.org/stable/c/fb3e566cafc38fe3ba35e6843a2d529a3748870c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8a29e60e2176b02e04f8737c8b32b696230eb0c5","name":"https://git.kernel.org/stable/c/8a29e60e2176b02e04f8737c8b32b696230eb0c5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5","name":"https://git.kernel.org/stable/c/abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72369","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72369","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2bb588cede1c1969e49c0a2822c8cb8b346b7682 a11ebaab50d27d6c4c78506f84ff36452e0b901d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f57ccd4657c7f082dc47e5b9e18a883bb5f9118f 959c95340a9e19cd333b4c18935fdeecbb2f319d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 31fefc18096cdc5549cfa54964d90e0b3229aedc abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c97a6ddc95690a938ded44b4e3202f03f15078c 8a29e60e2176b02e04f8737c8b32b696230eb0c5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.252 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.202 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.165 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19.6 6.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72369","cve":"CVE-2026-72369","epss":"0.001750000","percentile":"0.073380000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/minix/minix.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a11ebaab50d27d6c4c78506f84ff36452e0b901d","status":"affected","version":"2bb588cede1c1969e49c0a2822c8cb8b346b7682","versionType":"git"},{"lessThan":"959c95340a9e19cd333b4c18935fdeecbb2f319d","status":"affected","version":"f57ccd4657c7f082dc47e5b9e18a883bb5f9118f","versionType":"git"},{"lessThan":"abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5","status":"affected","version":"31fefc18096cdc5549cfa54964d90e0b3229aedc","versionType":"git"},{"lessThan":"8a29e60e2176b02e04f8737c8b32b696230eb0c5","status":"affected","version":"8c97a6ddc95690a938ded44b4e3202f03f15078c","versionType":"git"},{"lessThan":"fb3e566cafc38fe3ba35e6843a2d529a3748870c","status":"affected","version":"8c97a6ddc95690a938ded44b4e3202f03f15078c","versionType":"git"},{"status":"affected","version":"a051ecf5c5b0387840dc210413ed3bc7fbdaa69c","versionType":"git"},{"status":"affected","version":"d791c544efd6b9c944b43cf7f502e5bcb02fb941","versionType":"git"},{"status":"affected","version":"66c7c239c65341f99ae388d4d53dc9df2bcb9925","versionType":"git"},{"status":"affected","version":"1efc128ee4adbc23e082715425ff895449d233bc","versionType":"git"},{"lessThan":"6.6.145","status":"affected","version":"6.6.128","versionType":"semver"},{"lessThan":"6.12.97","status":"affected","version":"6.12.75","versionType":"semver"},{"lessThan":"6.18.40","status":"affected","version":"6.18.16","versionType":"semver"},{"lessThan":"5.11","status":"affected","version":"5.10.252","versionType":"semver"},{"lessThan":"5.16","status":"affected","version":"5.15.202","versionType":"semver"},{"lessThan":"6.2","status":"affected","version":"6.1.165","versionType":"semver"},{"lessThan":"6.20","status":"affected","version":"6.19.6","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/minix/minix.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.0"},{"lessThan":"7.0","status":"unaffected","version":"0","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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"6.6.128","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"6.12.75","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"6.18.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.252","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.202","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.165","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nminix: avoid overflow in bitmap block count calculation\n\nminix_check_superblock() uses minix_blocks_needed() to verify that the\non-disk imap and zmap block counts are large enough for the advertised\ninode and zone counts.\n\nThe helper currently performs DIV_ROUND_UP() in unsigned int arithmetic.\nA Minix v3 image can set s_ninodes or s_zones near UINT_MAX so the\naddition inside DIV_ROUND_UP() wraps to zero. That makes a zero imap/zmap\nblock count look valid, after which minix_fill_super() can dereference\ns_imap[0] or s_zmap[0] even though no bitmap buffers were allocated.\n\nImpact: mounting a crafted Minix v3 image whose s_ninodes or s_zones is\nnear UINT_MAX makes minix_check_superblock() accept a zero bitmap-block\ncount and minix_fill_super() dereference s_imap[0]/s_zmap[0], panicking\nthe kernel.\n\nThe divisor is the bitmap capacity in bits, blocksize * 8, which is\nalways a power of two: minix_fill_super() obtains the block size through\nsb_set_blocksize(), and blk_validate_block_size() rejects any size that\nis not a power of two. Use DIV_ROUND_UP_POW2(), which divides before\nadding the round-up term and so cannot overflow for a power-of-two\ndivisor."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached only when the kernel parses a crafted Minix V3 on-disk superblock during block-device mount (mount(2)/fsopen+fsmount → get_tree_bdev → minix_fill_super); Minix is not exposed via ksmbd, nfsd, or any network protocol handler.\nAC:L - A Minix V3 image with s_ninodes or s_zones near UINT_MAX and zero/small imap/zmap block counts deterministically makes minix_blocks_needed() wrap to zero, bypassing minix_check_superblock() every time without races or attacker-uncontrollable heap layout.\nPR:L - may_mount() requires CAP_SYS_ADMIN in the mount namespace, which unprivileged attackers obtain inside user namespaces; syzbot reproduced this via fuzzed mounts, and a loop-backed image supplies the required block device without init-namespace root.\nUI:N - No victim action is needed when the attacker with mount capability (e.g., CAP_SYS_ADMIN in a user/mount namespace) mounts their own malicious Minix v3 loop image; exploitation does not depend on tricking another user to open a file or insert removable media.\nS:U - The flaw corrupts or crashes kernel memory during superblock initialization in the mounting context only; it does not cross VM, container, or IOMMU boundaries and matches standard in-kernel memory-corruption/DoS impact (Scope Unchanged).\nC:H - With imap_blocks=1 and overflow-bypassed zmap_blocks=0, s_zmap=&map[1] performs an out-of-bounds heap read of a buffer_head pointer past the under-allocated map; s_imap[0]/s_zmap[0] dereferences on zero-block images also read uninitialized/garbage pointers before panic.\nI:H - After the overflow bypass, minix_set_bit(0,sbi->s_zmap[0]->b_data) uses the OOB-read pointer and can set a bit at an attacker-influenced kernel address; this is exploitable memory corruption during mount, not a guaranteed-safe NULL-only crash.\nA:H - minix_fill_super() dereferences unallocated s_imap[0]/s_zmap[0] entries and faults the kernel (oops/panic); even the one-bit write via corrupted pointers can immediately fault, causing total loss of kernel availability on the affected system."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:43:23.188Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a11ebaab50d27d6c4c78506f84ff36452e0b901d"},{"url":"https://git.kernel.org/stable/c/959c95340a9e19cd333b4c18935fdeecbb2f319d"},{"url":"https://git.kernel.org/stable/c/abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5"},{"url":"https://git.kernel.org/stable/c/8a29e60e2176b02e04f8737c8b32b696230eb0c5"},{"url":"https://git.kernel.org/stable/c/fb3e566cafc38fe3ba35e6843a2d529a3748870c"}],"title":"minix: avoid overflow in bitmap block count calculation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72369","datePublished":"2026-08-15T05:56:05.995Z","dateReserved":"2026-08-09T03:40:39.922Z","dateUpdated":"2026-08-17T05:43:23.188Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:10","lastModifiedDate":"2026-08-17 06:18:41","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72369","Ordinal":"1","Title":"minix: avoid overflow in bitmap block count calculation","CVE":"CVE-2026-72369","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72369","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nminix: avoid overflow in bitmap block count calculation\n\nminix_check_superblock() uses minix_blocks_needed() to verify that the\non-disk imap and zmap block counts are large enough for the advertised\ninode and zone counts.\n\nThe helper currently performs DIV_ROUND_UP() in unsigned int arithmetic.\nA Minix v3 image can set s_ninodes or s_zones near UINT_MAX so the\naddition inside DIV_ROUND_UP() wraps to zero. That makes a zero imap/zmap\nblock count look valid, after which minix_fill_super() can dereference\ns_imap[0] or s_zmap[0] even though no bitmap buffers were allocated.\n\nImpact: mounting a crafted Minix v3 image whose s_ninodes or s_zones is\nnear UINT_MAX makes minix_check_superblock() accept a zero bitmap-block\ncount and minix_fill_super() dereference s_imap[0]/s_zmap[0], panicking\nthe kernel.\n\nThe divisor is the bitmap capacity in bits, blocksize * 8, which is\nalways a power of two: minix_fill_super() obtains the block size through\nsb_set_blocksize(), and blk_validate_block_size() rejects any size that\nis not a power of two. Use DIV_ROUND_UP_POW2(), which divides before\nadding the round-up term and so cannot overflow for a power-of-two\ndivisor.","Type":"Description","Title":"minix: avoid overflow in bitmap block count calculation"}]}}}