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CVE-2026-72107 (GCVE-0-2026-72107)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:40
VLAI
Title
dm era: fix out-of-bounds memory access for non-zero start sector
Summary
In the Linux kernel, the following vulnerability has been resolved: dm era: fix out-of-bounds memory access for non-zero start sector dm-era tracks writes in target-relative blocks, but era_map() calculates the writeset block before applying the target offset. Tables with a non-zero start sector can therefore pass an absolute mapped-device block to metadata_current_marked(). If the absolute block is beyond the current writeset size, writeset_marked() tests past the end of the in-core bitset. KASAN reports this as a vmalloc-out-of-bounds access. Apply the target offset before calculating the era block so writeset lookups use the target-relative block number.
Severity
8.8 (High)
CVSS:3.1/AV:N/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: eec40579d84873dfb7021eb24c50360f073237c5 , < fe94a0b14010a3c267ff9a2508afb4f27ff1c5bf (git)
Affected: eec40579d84873dfb7021eb24c50360f073237c5 , < e3ffa8e492e5cdee62d916ee3e9244ccce2b73c5 (git)
Affected: eec40579d84873dfb7021eb24c50360f073237c5 , < 9946a7176bd8c25ddd6e5f1799c54e572ee6bf0f (git)
Affected: eec40579d84873dfb7021eb24c50360f073237c5 , < 7e1822f83c5a1ee7b4a19e98edde8770a10b4c71 (git)
Affected: eec40579d84873dfb7021eb24c50360f073237c5 , < db5f9b4601f0012038e5a2628aedec2f47933380 (git)
Affected: eec40579d84873dfb7021eb24c50360f073237c5 , < 1fcb5e29dd7a5b85adb9d8b539911741d878e829 (git)
Affected: eec40579d84873dfb7021eb24c50360f073237c5 , < bafe3e720cdac38cd7ea4eb7852a8f2dbe1bbfe6 (git)
Affected: eec40579d84873dfb7021eb24c50360f073237c5 , < a868196f03c2b19418ae3d2b69e195d668a271e5 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (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)
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm era: fix out-of-bounds memory access for non-zero start sector\n\ndm-era tracks writes in target-relative blocks, but era_map() calculates\nthe writeset block before applying the target offset.  Tables with a\nnon-zero start sector can therefore pass an absolute mapped-device block\nto metadata_current_marked().\n\nIf the absolute block is beyond the current writeset size,\nwriteset_marked() tests past the end of the in-core bitset.  KASAN reports\nthis as a vmalloc-out-of-bounds access.\n\nApply the target offset before calculating the era block so writeset\nlookups use the target-relative block number."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:N - The bug is hit in era_map() on write bios submitted to a dm-era device; on storage servers that expose dm-era-backed LUNs via iSCSI or NVMe-oF, a remote initiator\u0027s SCSI/NVMe writes traverse the network stack into dm_submit_bio() and reach the flawed writeset lookup without local shell access.\nAC:L - Once a dm-era table uses a non-zero start sector (common when mapping a partition offset), any single write I/O deterministically passes an out-of-range block index to writeset_marked()/test_bit(); no race, special heap layout, or victim state beyond that configuration is required.\nPR:L - Exploitation requires only write access to the dm-era-backed block device (filesystem, raw /dev/dm-* node, or authenticated iSCSI/NVMe-oF initiator credentials); loading the dm table needs CAP_SYS_ADMIN, but triggering the OOB read does not\u2014unprivileged local users or remote storage clients with write permission suffice.\nUI:N - Triggering the flaw requires only the attacker\u0027s own write I/O to the dm-era volume; no victim must mount a filesystem, open a file, click a link, or perform any separate interactive action beyond routine storage writes.\nS:U - The vmalloc out-of-bounds read and any resulting kernel oops or privilege escalation occur entirely within the host kernel\u0027s device-mapper/storage subsystem on the same machine; this is not a VM escape, IOMMU bypass, or other cross-security-authority boundary violation.\nC:H - writeset_marked() calls test_bit() with an attacker-influenced block index derived from the write offset; when the absolute block exceeds the writeset size this is a vmalloc out-of-bounds read that can disclose adjacent kernel heap memory, matching CNA guidance for OOB reads.\nI:H - Kernel vmalloc out-of-bounds access via test_bit() is memory corruption in a privileged context; disclosed adjacent heap contents can be used to craft follow-on arbitrary-write or control-flow hijack primitives, so integrity impact is rated High when uncertain between Low and High.\nA:H - KASAN reports this as vmalloc-out-of-bounds, and reading past the vzalloc\u0027d bitset can fault on unmapped pages or provoke a kernel oops/panic, causing immediate denial of service on storage nodes processing writes through dm-era."
            }
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        "dateUpdated": "2026-08-17T05:40:20.098Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/fe94a0b14010a3c267ff9a2508afb4f27ff1c5bf"
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    "datePublished": "2026-08-15T05:52:49.581Z",
    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-08-17T05:40:20.098Z",
    "state": "PUBLISHED"
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KASAN reports\\nthis as a vmalloc-out-of-bounds access.\\n\\nApply the target offset before calculating the era block so writeset\\nlookups use the target-relative block number.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/md/dm-era-target.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"eec40579d84873dfb7021eb24c50360f073237c5\",\"lessThan\":\"fe94a0b14010a3c267ff9a2508afb4f27ff1c5bf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"eec40579d84873dfb7021eb24c50360f073237c5\",\"lessThan\":\"e3ffa8e492e5cdee62d916ee3e9244ccce2b73c5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"eec40579d84873dfb7021eb24c50360f073237c5\",\"lessThan\":\"9946a7176bd8c25ddd6e5f1799c54e572ee6bf0f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"eec40579d84873dfb7021eb24c50360f073237c5\",\"lessThan\":\"7e1822f83c5a1ee7b4a19e98edde8770a10b4c71\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"eec40579d84873dfb7021eb24c50360f073237c5\",\"lessThan\":\"db5f9b4601f0012038e5a2628aedec2f47933380\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"eec40579d84873dfb7021eb24c50360f073237c5\",\"lessThan\":\"1fcb5e29dd7a5b85adb9d8b539911741d878e829\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"eec40579d84873dfb7021eb24c50360f073237c5\",\"lessThan\":\"bafe3e720cdac38cd7ea4eb7852a8f2dbe1bbfe6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"eec40579d84873dfb7021eb24c50360f073237c5\",\"lessThan\":\"a868196f03c2b19418ae3d2b69e195d668a271e5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/md/dm-era-target.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.15\",\"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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1fcb5e29dd7a5b85adb9d8b539911741d878e829\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7e1822f83c5a1ee7b4a19e98edde8770a10b4c71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9946a7176bd8c25ddd6e5f1799c54e572ee6bf0f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a868196f03c2b19418ae3d2b69e195d668a271e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bafe3e720cdac38cd7ea4eb7852a8f2dbe1bbfe6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db5f9b4601f0012038e5a2628aedec2f47933380\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3ffa8e492e5cdee62d916ee3e9244ccce2b73c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe94a0b14010a3c267ff9a2508afb4f27ff1c5bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T22:16:06+00:00",
      "cve": "CVE-2026-72107",
      "id": "CVE-2026-72107",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm era: fix out-of-bounds memory access for non-zero start sector",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72107.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

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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.