CVE-2026-72105 (GCVE-0-2026-72105)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-10-19 21:19
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: dm-log: fix a bitset_size overflow on 32bit machines Commit c20e36b7631d ("dm log: fix out-of-bounds write due to region_count overflow") made sure that region_count could fit in an unsigned int. But the bitmap memory isn't allocated based on region_count. It uses bitset_size (a size_t variable). The first step of calculating bitset_size is to set it to region_count, rounded up to a multiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG smaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit architecture, this will make bitset_size wrap around to 0 and fail, despite region_count being valid. Since bitset_size gets divided by 8, it can hold any valid region_count. It just needs a special case to handle the rollover. If it is 0, the value rolled over, and bitset size should be set to the number of bytes needed to hold 2^32 bits.
References
Impacted products
Vendor Product Version
Linux Linux Version: 44ab8875ae4a2842bde2d756bed195d375e0debb
Version: defe483e47173768c227532694dc78cb65db5f09
Version: 3ec74da927b4e171a6fc0e77b1188ba4d019af51
Version: d4ac87567f86a55c3c92e9a5144dcd943a9772a1
Version: 12bd5b88e91a02785244ff1d20fb157e96e9cdc8
Version: b455903eed4558982be0811f5b7f44f6bbc4ff57
Version: c20e36b7631d83e7535877f08af8b0af72c44b1a
Version: c20e36b7631d83e7535877f08af8b0af72c44b1a
Version: 4ec8323b9f0764a14d532b1ae9b87f8a9fecb867
Version: 5.10.258   ≤
Version: 5.15.209   ≤
Version: 6.1.175   ≤
Version: 6.6.141   ≤
Version: 6.12.91   ≤
Version: 6.18.33   ≤
Version: 7.0.10   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-log: fix a bitset_size overflow on 32bit machines\n\nCommit c20e36b7631d (\"dm log: fix out-of-bounds write due to\nregion_count overflow\") made sure that region_count could fit in an\nunsigned int. But the bitmap memory isn\u0027t allocated based on\nregion_count. It uses bitset_size (a size_t variable). The first step of\ncalculating bitset_size is to set it to region_count, rounded up to a\nmultiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG\nsmaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit\narchitecture, this will make bitset_size wrap around to 0 and fail,\ndespite region_count being valid.\n\nSince bitset_size gets divided by 8, it can hold any valid region_count.\nIt just needs a special case to handle the rollover. If it is 0, the\nvalue rolled over, and bitset size should be set to the number of bytes\nneeded to hold 2^32 bits."
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              "value": "AV:L - The flaw is reached only via local Device Mapper ioctls on /dev/mapper/control (dmsetup table load creating a mirror with core/disk log); there is no network, wireless, or physical-bus receive path into create_log_context().\nAC:L - A CAP_SYS_ADMIN attacker fully controls mirror table length and region_size via dmsetup, deterministically forcing region_count into the UINT_MAX-30..UINT_MAX wrap range on 32-bit kernels without races or victim-specific heap layout.\nPR:L - DM control ioctls require CAP_SYS_ADMIN, which is obtainable inside an unprivileged user namespace per kernel CNA guidance; mirror/dm-log setup is not limited to init-namespace root on typical container-capable systems.\nUI:N - Exploitation requires only the attacker issuing dmsetup/ioctl to create or resume a mirror with crafted parameters; no separate victim action such as mounting a filesystem or opening a file is needed.\nS:U - Impact is kernel vmalloc heap corruption and privilege escalation within the host kernel; it does not cross a VM, hypervisor, or IOMMU security boundary.\nC:H - Wrapping bitset_size to zero undersizes clean_bits/sync_bits/recovering_bits versus lc-\u003eregion_count near UINT_MAX; subsequent log_test_bit/__set_bit_le calls during mirror I/O perform out-of-bounds reads of adjacent vmalloc heap memory.\nI:H - The same undersized bitmap sizing lets log_set_bit and log_clear_bit write far beyond the allocated bitset via region indices derived from dm mirror bios, corrupting adjacent kernel heap objects exploitable for arbitrary write or code execution.\nA:H - Identical dm-log bitset paths (e.g., core_in_sync calling log_test_bit) have been shown to kernel-crash with CR2 faults from out-of-bounds heap access; triggering this overflow causes oops, panic, or hang on affected 32-bit storage nodes."
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          "url": "https://git.kernel.org/stable/c/9743132a41f4d9d0e54c5f2adcb821b04796bab1"
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      "title": "dm-log: fix a bitset_size overflow on 32bit machines",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72105",
    "datePublished": "2026-08-15T05:52:48.099Z",
    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-10-19T21:19:28.267Z",
    "state": "PUBLISHED"
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kernel; it does not cross a VM, hypervisor, or IOMMU security boundary.\\nC:H - Wrapping bitset_size to zero undersizes clean_bits/sync_bits/recovering_bits versus lc-\u003eregion_count near UINT_MAX; subsequent log_test_bit/__set_bit_le calls during mirror I/O perform out-of-bounds reads of adjacent vmalloc heap memory.\\nI:H - The same undersized bitmap sizing lets log_set_bit and log_clear_bit write far beyond the allocated bitset via region indices derived from dm mirror bios, corrupting adjacent kernel heap objects exploitable for arbitrary write or code execution.\\nA:H - Identical dm-log bitset paths (e.g., core_in_sync calling log_test_bit) have been shown to kernel-crash with CR2 faults from out-of-bounds heap access; triggering this overflow causes oops, panic, or hang on affected 32-bit storage nodes.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": 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\"https://git.kernel.org/stable/c/567602fa72d57169365cbc589e0b8c3be900636d\"}, {\"url\": \"https://git.kernel.org/stable/c/d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a\"}, {\"url\": \"https://git.kernel.org/stable/c/1c3412b584e1fb6c665ff33ba7259253bc0082cb\"}, {\"url\": \"https://git.kernel.org/stable/c/e0b0163a65758ec3a2361ae1cea407898c27f21e\"}, {\"url\": \"https://git.kernel.org/stable/c/79feb87ab2396d49b9b65e4bb815d33cc71cba47\"}, {\"url\": \"https://git.kernel.org/stable/c/9743132a41f4d9d0e54c5f2adcb821b04796bab1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm-log: fix a bitset_size overflow on 32bit machines\\n\\nCommit c20e36b7631d (\\\"dm log: fix out-of-bounds write due to\\nregion_count overflow\\\") made sure that region_count could fit in an\\nunsigned int. But the bitmap memory isn\u0027t allocated based on\\nregion_count. It uses bitset_size (a size_t variable). The first step of\\ncalculating bitset_size is to set it to region_count, rounded up to a\\nmultiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG\\nsmaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit\\narchitecture, this will make bitset_size wrap around to 0 and fail,\\ndespite region_count being valid.\\n\\nSince bitset_size gets divided by 8, it can hold any valid region_count.\\nIt just needs a special case to handle the rollover. If it is 0, the\\nvalue rolled over, and bitset size should be set to the number of bytes\\nneeded to hold 2^32 bits.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"5.10.258\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"5.15.209\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"6.1.175\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"6.6.141\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"6.12.91\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"6.18.33\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"7.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"7.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"7.0.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:40:19.004Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72105\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:19:28.267Z\", \"dateReserved\": \"2026-08-09T03:40:39.906Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:52:48.099Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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