{"api_version":"1","generated_at":"2026-08-22T08:37:10+00:00","cve":"CVE-2026-72107","urls":{"html":"https://cve.report/CVE-2026-72107","api":"https://cve.report/api/cve/CVE-2026-72107.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72107","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72107"},"summary":{"title":"dm era: fix out-of-bounds memory access for non-zero start sector","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:24","updated_at":"2026-08-17 06:18:09"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/7e1822f83c5a1ee7b4a19e98edde8770a10b4c71","name":"https://git.kernel.org/stable/c/7e1822f83c5a1ee7b4a19e98edde8770a10b4c71","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a868196f03c2b19418ae3d2b69e195d668a271e5","name":"https://git.kernel.org/stable/c/a868196f03c2b19418ae3d2b69e195d668a271e5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9946a7176bd8c25ddd6e5f1799c54e572ee6bf0f","name":"https://git.kernel.org/stable/c/9946a7176bd8c25ddd6e5f1799c54e572ee6bf0f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/db5f9b4601f0012038e5a2628aedec2f47933380","name":"https://git.kernel.org/stable/c/db5f9b4601f0012038e5a2628aedec2f47933380","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fe94a0b14010a3c267ff9a2508afb4f27ff1c5bf","name":"https://git.kernel.org/stable/c/fe94a0b14010a3c267ff9a2508afb4f27ff1c5bf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e3ffa8e492e5cdee62d916ee3e9244ccce2b73c5","name":"https://git.kernel.org/stable/c/e3ffa8e492e5cdee62d916ee3e9244ccce2b73c5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bafe3e720cdac38cd7ea4eb7852a8f2dbe1bbfe6","name":"https://git.kernel.org/stable/c/bafe3e720cdac38cd7ea4eb7852a8f2dbe1bbfe6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1fcb5e29dd7a5b85adb9d8b539911741d878e829","name":"https://git.kernel.org/stable/c/1fcb5e29dd7a5b85adb9d8b539911741d878e829","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72107","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72107","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eec40579d84873dfb7021eb24c50360f073237c5 fe94a0b14010a3c267ff9a2508afb4f27ff1c5bf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eec40579d84873dfb7021eb24c50360f073237c5 e3ffa8e492e5cdee62d916ee3e9244ccce2b73c5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eec40579d84873dfb7021eb24c50360f073237c5 9946a7176bd8c25ddd6e5f1799c54e572ee6bf0f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eec40579d84873dfb7021eb24c50360f073237c5 7e1822f83c5a1ee7b4a19e98edde8770a10b4c71 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72107","cve":"CVE-2026-72107","epss":"0.006320000","percentile":"0.473740000","score_date":"2026-08-17","updated_at":"2026-08-18 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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":[{"cvssV3_1":{"baseScore":8.8,"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"},"scenarios":[{"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's 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—unprivileged local users or remote storage clients with write permission suffice.\nUI:N - Triggering the flaw requires only the attacker's 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's 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'd 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."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:40:20.098Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/fe94a0b14010a3c267ff9a2508afb4f27ff1c5bf"},{"url":"https://git.kernel.org/stable/c/e3ffa8e492e5cdee62d916ee3e9244ccce2b73c5"},{"url":"https://git.kernel.org/stable/c/9946a7176bd8c25ddd6e5f1799c54e572ee6bf0f"},{"url":"https://git.kernel.org/stable/c/7e1822f83c5a1ee7b4a19e98edde8770a10b4c71"},{"url":"https://git.kernel.org/stable/c/db5f9b4601f0012038e5a2628aedec2f47933380"},{"url":"https://git.kernel.org/stable/c/1fcb5e29dd7a5b85adb9d8b539911741d878e829"},{"url":"https://git.kernel.org/stable/c/bafe3e720cdac38cd7ea4eb7852a8f2dbe1bbfe6"},{"url":"https://git.kernel.org/stable/c/a868196f03c2b19418ae3d2b69e195d668a271e5"}],"title":"dm era: fix out-of-bounds memory access for non-zero start sector","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72107","datePublished":"2026-08-15T05:52:49.581Z","dateReserved":"2026-08-09T03:40:39.906Z","dateUpdated":"2026-08-17T05:40:20.098Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:24","lastModifiedDate":"2026-08-17 06:18:09","problem_types":[],"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72107","Ordinal":"1","Title":"dm era: fix out-of-bounds memory access for non-zero start secto","CVE":"CVE-2026-72107","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72107","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"dm era: fix out-of-bounds memory access for non-zero start secto"}]}}}