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CVE-2026-89615 (GCVE-0-2026-89615)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
Title
fs/ntfs3: bound page_lcns[] index by the log record
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound page_lcns[] index by the log record The copy_lcns loop and the redo shorten loop index page_lcns[] at j + i, where i runs up to the log record's lcns_follow. That count is checked only against the record's own length, not the target entry, so check_dp_table() (which validates the entry's lcns_follow) does not cover it: the copy_lcns entry may even be freshly allocated after that check, and find_dp() bounds j but not i. A crafted record thus overflows page_lcns[] of an otherwise valid entry. Add dp_range_ok() and reject, before each loop, any record whose run does not fit the entry. These are the only two page_lcns[] accesses indexed by the record rather than the entry, so together with the entry validation every access is now bounded. [almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 31fdd11f75da9823500168cecb07aa45130915a3 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < bb742d1030864c0fe140666f639428ba4e90b2ca (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 61ca8cbbf68f77f25b699ed4358bd232f94ed43b (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < f4c1bc6d7331f344ffcea93c2a37badcbe15baa6 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 7ccb94901f38a062034b56b43c774050b113758f (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 1135ebc225996b3ac1a295652b19a0a706737a6c (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 6f7b9dbdc1b7520206abce0049bdd143eb536e75 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound page_lcns[] index by the log record\n\nThe copy_lcns loop and the redo shorten loop index page_lcns[] at j + i,\nwhere i runs up to the log record\u0027s lcns_follow. That count is checked only\nagainst the record\u0027s own length, not the target entry, so check_dp_table()\n(which validates the entry\u0027s lcns_follow) does not cover it: the copy_lcns\nentry may even be freshly allocated after that check, and find_dp() bounds j\nbut not i. A crafted record thus overflows page_lcns[] of an otherwise valid\nentry.\n\nAdd dp_range_ok() and reject, before each loop, any record whose run does\nnot fit the entry. These are the only two page_lcns[] accesses indexed by\nthe record rather than the entry, so together with the entry validation\nevery access is now bounded.\n\n[almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]"
        }
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            {
              "lang": "en",
              "value": "AV:L - The page_lcns[] overflow is reached only in log_replay() on the local ntfs3 mount path (path_mount\u2192ntfs_fill_super\u2192ntfs_loadlog_and_replay\u2192log_replay). ksmbd/nfsd never parse $LogFile; journal replay runs at fill_super, not while serving exported files.\nAC:L - An attacker fully controls crafted $LogFile LOG_REC_HDR fields (target_vcn, lcns_follow) and the target DIR_PAGE_ENTRY. find_dp() only bounds the base index j; the redo shorten loop then indexes page_lcns[j+i-1] with i up to the record\u0027s lcns_follow, so the OOB access is deterministic with no race.\nPR:N - No account or privilege on the victim is required: a crafted NTFS volume on USB/removable media, a disk image, or shared storage is sufficient for udisks2/systemd automount or an administrator mount to run $LogFile replay as root.\nUI:N - Desktop, kiosk, and shared-workstation automounters mount attacker-supplied NTFS media and run log_replay() inside ntfs_fill_super() without the user opening files or confirming a dialog; attaching the crafted volume is sufficient to trigger the overflow.\nS:U - Heap out-of-bounds page_lcns[] access occurs in the host kernel during ntfs3 journal replay in the mounting process; impact stays within one kernel security authority and is not a VM escape or IOMMU/DMA bypass.\nC:H - The redo shorten loop reads dp-\u003epage_lcns[j+i-1] with i taken from the log record\u0027s lcns_follow (u16, up to 65535 entries / ~512KB past the DIR_PAGE_ENTRY). That unbounded slab out-of-bounds read of adjacent heap is Confidentiality High per kernel OOB-read guidance.\nI:H - On unfixed kernels the copy_lcns analysis loop wrote attacker-controlled __le64 values past page_lcns[], a heap OOB write. Independently, OOB page_lcns[] reads in the redo pass control dlen passed to do_action() memcpy/memmove into MFT and index buffers, enabling further kernel writes.\nA:H - Indexing far past the kmalloc-backed DIR_PAGE_ENTRY in log_replay() on mount can fault unmapped adjacent slab memory, causing a kernel oops or panic. The crash is repeatable on every mount of the crafted NTFS volume."
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      "title": "fs/ntfs3: bound page_lcns[] index by the log record",
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    "datePublished": "2026-09-11T19:45:15.397Z",
    "dateReserved": "2026-09-11T19:38:34.735Z",
    "dateUpdated": "2026-09-14T12:01:31.040Z",
    "state": "PUBLISHED"
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A crafted record thus overflows page_lcns[] of an otherwise valid\\nentry.\\n\\nAdd dp_range_ok() and reject, before each loop, any record whose run does\\nnot fit the entry. These are the only two page_lcns[] accesses indexed by\\nthe record rather than the entry, so together with the entry validation\\nevery access is now bounded.\\n\\n[almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ntfs3/fslog.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"31fdd11f75da9823500168cecb07aa45130915a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"bb742d1030864c0fe140666f639428ba4e90b2ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"61ca8cbbf68f77f25b699ed4358bd232f94ed43b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"f4c1bc6d7331f344ffcea93c2a37badcbe15baa6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"7ccb94901f38a062034b56b43c774050b113758f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"1135ebc225996b3ac1a295652b19a0a706737a6c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"6f7b9dbdc1b7520206abce0049bdd143eb536e75\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ntfs3/fslog.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"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:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1135ebc225996b3ac1a295652b19a0a706737a6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/31fdd11f75da9823500168cecb07aa45130915a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/61ca8cbbf68f77f25b699ed4358bd232f94ed43b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f7b9dbdc1b7520206abce0049bdd143eb536e75\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ccb94901f38a062034b56b43c774050b113758f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb742d1030864c0fe140666f639428ba4e90b2ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4c1bc6d7331f344ffcea93c2a37badcbe15baa6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T06:59:20+00:00",
      "cve": "CVE-2026-89615",
      "id": "CVE-2026-89615",
      "initial_release_date": "2026-09-11T19:45:15.397000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: NTFS3 driver buffer overflow via crafted log record",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89615.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:01:39Z",
      "cve": "CVE-2026-89615",
      "id": "CVE-2026-89615",
      "initial_release_date": "2026-09-12T16:25:00Z",
      "product_status:known_affected": "114",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89615",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89615.json",
      "version": "4"
    }
  }
}



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