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CVE-2026-72105 (GCVE-0-2026-72105)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:40
VLAI
Title
dm-log: fix a bitset_size overflow on 32bit machines
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.
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: 44ab8875ae4a2842bde2d756bed195d375e0debb , < cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5 (git)
Affected: defe483e47173768c227532694dc78cb65db5f09 , < 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723 (git)
Affected: 3ec74da927b4e171a6fc0e77b1188ba4d019af51 , < 567602fa72d57169365cbc589e0b8c3be900636d (git)
Affected: d4ac87567f86a55c3c92e9a5144dcd943a9772a1 , < d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a (git)
Affected: 12bd5b88e91a02785244ff1d20fb157e96e9cdc8 , < 1c3412b584e1fb6c665ff33ba7259253bc0082cb (git)
Affected: b455903eed4558982be0811f5b7f44f6bbc4ff57 , < e0b0163a65758ec3a2361ae1cea407898c27f21e (git)
Affected: c20e36b7631d83e7535877f08af8b0af72c44b1a , < 79feb87ab2396d49b9b65e4bb815d33cc71cba47 (git)
Affected: c20e36b7631d83e7535877f08af8b0af72c44b1a , < 9743132a41f4d9d0e54c5f2adcb821b04796bab1 (git)
Affected: 4ec8323b9f0764a14d532b1ae9b87f8a9fecb867 (git)
Affected: 5.10.258 , < 5.10.261 (semver)
Affected: 5.15.209 , < 5.15.212 (semver)
Affected: 6.1.175 , < 6.1.178 (semver)
Affected: 6.6.141 , < 6.6.145 (semver)
Affected: 6.12.91 , < 6.12.97 (semver)
Affected: 6.18.33 , < 6.18.40 (semver)
Affected: 7.0.10 , < 7.1 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (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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          "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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            "version": "3.1"
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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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        "dateUpdated": "2026-08-17T05:40:19.004Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5"
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        {
          "url": "https://git.kernel.org/stable/c/4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723"
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          "url": "https://git.kernel.org/stable/c/d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a"
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        {
          "url": "https://git.kernel.org/stable/c/9743132a41f4d9d0e54c5f2adcb821b04796bab1"
        }
      ],
      "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": "2026-08-17T05:40:19.004Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72105",
      "date": "2026-09-04",
      "epss": "0.00169",
      "percentile": "0.06419"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72105\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:21:24.673\",\"lastModified\":\"2026-08-17T06:18:09.470\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/md/dm-log.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"44ab8875ae4a2842bde2d756bed195d375e0debb\",\"lessThan\":\"cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"defe483e47173768c227532694dc78cb65db5f09\",\"lessThan\":\"4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ec74da927b4e171a6fc0e77b1188ba4d019af51\",\"lessThan\":\"567602fa72d57169365cbc589e0b8c3be900636d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d4ac87567f86a55c3c92e9a5144dcd943a9772a1\",\"lessThan\":\"d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"12bd5b88e91a02785244ff1d20fb157e96e9cdc8\",\"lessThan\":\"1c3412b584e1fb6c665ff33ba7259253bc0082cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b455903eed4558982be0811f5b7f44f6bbc4ff57\",\"lessThan\":\"e0b0163a65758ec3a2361ae1cea407898c27f21e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c20e36b7631d83e7535877f08af8b0af72c44b1a\",\"lessThan\":\"79feb87ab2396d49b9b65e4bb815d33cc71cba47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c20e36b7631d83e7535877f08af8b0af72c44b1a\",\"lessThan\":\"9743132a41f4d9d0e54c5f2adcb821b04796bab1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4ec8323b9f0764a14d532b1ae9b87f8a9fecb867\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.258\",\"lessThan\":\"5.10.261\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.209\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.175\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.141\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.91\",\"lessThan\":\"6.12.97\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.33\",\"lessThan\":\"6.18.40\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.0.10\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/md/dm-log.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"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/1c3412b584e1fb6c665ff33ba7259253bc0082cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/567602fa72d57169365cbc589e0b8c3be900636d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79feb87ab2396d49b9b65e4bb815d33cc71cba47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9743132a41f4d9d0e54c5f2adcb821b04796bab1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e0b0163a65758ec3a2361ae1cea407898c27f21e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T22:06:49+00:00",
      "cve": "CVE-2026-72105",
      "id": "CVE-2026-72105",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm-log: fix a bitset_size overflow on 32bit machines",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72105.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.

Sightings

Author Source Type Date Other

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.