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CVE-2026-72369 (GCVE-0-2026-72369)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
minix: avoid overflow in bitmap block count calculation
Summary
In the Linux kernel, the following vulnerability has been resolved: minix: avoid overflow in bitmap block count calculation minix_check_superblock() uses minix_blocks_needed() to verify that the on-disk imap and zmap block counts are large enough for the advertised inode and zone counts. The helper currently performs DIV_ROUND_UP() in unsigned int arithmetic. A Minix v3 image can set s_ninodes or s_zones near UINT_MAX so the addition inside DIV_ROUND_UP() wraps to zero. That makes a zero imap/zmap block count look valid, after which minix_fill_super() can dereference s_imap[0] or s_zmap[0] even though no bitmap buffers were allocated. Impact: mounting a crafted Minix v3 image whose s_ninodes or s_zones is near UINT_MAX makes minix_check_superblock() accept a zero bitmap-block count and minix_fill_super() dereference s_imap[0]/s_zmap[0], panicking the kernel. The divisor is the bitmap capacity in bits, blocksize * 8, which is always a power of two: minix_fill_super() obtains the block size through sb_set_blocksize(), and blk_validate_block_size() rejects any size that is not a power of two. Use DIV_ROUND_UP_POW2(), which divides before adding the round-up term and so cannot overflow for a power-of-two divisor.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2bb588cede1c1969e49c0a2822c8cb8b346b7682 , < a11ebaab50d27d6c4c78506f84ff36452e0b901d (git)
Affected: f57ccd4657c7f082dc47e5b9e18a883bb5f9118f , < 959c95340a9e19cd333b4c18935fdeecbb2f319d (git)
Affected: 31fefc18096cdc5549cfa54964d90e0b3229aedc , < abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5 (git)
Affected: 8c97a6ddc95690a938ded44b4e3202f03f15078c , < 8a29e60e2176b02e04f8737c8b32b696230eb0c5 (git)
Affected: 8c97a6ddc95690a938ded44b4e3202f03f15078c , < fb3e566cafc38fe3ba35e6843a2d529a3748870c (git)
Affected: a051ecf5c5b0387840dc210413ed3bc7fbdaa69c (git)
Affected: d791c544efd6b9c944b43cf7f502e5bcb02fb941 (git)
Affected: 66c7c239c65341f99ae388d4d53dc9df2bcb9925 (git)
Affected: 1efc128ee4adbc23e082715425ff895449d233bc (git)
Affected: 6.6.128 , < 6.6.145 (semver)
Affected: 6.12.75 , < 6.12.97 (semver)
Affected: 6.18.16 , < 6.18.40 (semver)
Affected: 5.10.252 , < 5.11 (semver)
Affected: 5.15.202 , < 5.16 (semver)
Affected: 6.1.165 , < 6.2 (semver)
Affected: 6.19.6 , < 6.20 (semver)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "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."
        }
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        {
          "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 \u2192 get_tree_bdev \u2192 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=\u0026map[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-\u003es_zmap[0]-\u003eb_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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/fb3e566cafc38fe3ba35e6843a2d529a3748870c"
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      "title": "minix: avoid overflow in bitmap block count calculation",
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    "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"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/minix/minix.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2bb588cede1c1969e49c0a2822c8cb8b346b7682\",\"lessThan\":\"a11ebaab50d27d6c4c78506f84ff36452e0b901d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f57ccd4657c7f082dc47e5b9e18a883bb5f9118f\",\"lessThan\":\"959c95340a9e19cd333b4c18935fdeecbb2f319d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"31fefc18096cdc5549cfa54964d90e0b3229aedc\",\"lessThan\":\"abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8c97a6ddc95690a938ded44b4e3202f03f15078c\",\"lessThan\":\"8a29e60e2176b02e04f8737c8b32b696230eb0c5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8c97a6ddc95690a938ded44b4e3202f03f15078c\",\"lessThan\":\"fb3e566cafc38fe3ba35e6843a2d529a3748870c\",\"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\",\"status\":\"affected\"},{\"version\":\"6.6.128\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.75\",\"lessThan\":\"6.12.97\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.16\",\"lessThan\":\"6.18.40\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.252\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.202\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.165\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.19.6\",\"lessThan\":\"6.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/minix/minix.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/8a29e60e2176b02e04f8737c8b32b696230eb0c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/959c95340a9e19cd333b4c18935fdeecbb2f319d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a11ebaab50d27d6c4c78506f84ff36452e0b901d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/abe3536a4bedcc43de80b6d4d7e3d57e9ba382a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb3e566cafc38fe3ba35e6843a2d529a3748870c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:43:22+00:00",
      "cve": "CVE-2026-72369",
      "id": "CVE-2026-72369",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: minix: avoid overflow in bitmap block count calculation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72369.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.