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CVE-2026-89781 (GCVE-0-2026-89781)

Vulnerability from cvelistv5 – Published: 2026-09-16 08:48 – Updated: 2026-09-16 14:38
VLAI
Title
fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix out-of-bounds read in read_log_rec_buf() read_log_rec_buf() copies a log record into a caller buffer starting at u32 off = lsn_to_page_off(log, lsn) + log->record_header_len; log->record_header_len (and log->data_off, used for the following pages) comes verbatim from the on-disk restart area and is only checked for 8-byte alignment in is_rst_area_valid(), so off can exceed log->page_size. "tail = log->page_size - off" then underflows and memcpy() reads past the page_size-sized buffer returned by read_log_page(), spilling adjacent slab memory into the replay buffer. This is reachable by mounting a crafted NTFS image: BUG: KASAN: slab-out-of-bounds in read_log_rec_buf+0x216/0x580 Read of size 64 at addr ffff88800a877ff8 by task exploit/127 read_log_rec_buf fs/ntfs3/fslog.c:2299 log_replay fs/ntfs3/fslog.c:4216 ntfs_loadlog_and_replay fs/ntfs3/fsntfs.c:324 ntfs_fill_super fs/ntfs3/super.c:1392 get_tree_bdev_flags fs/super.c:1694 __x64_sys_mount fs/namespace.c:4360 The buggy address is located 4088 bytes to the right of the 4096-byte region [ffff88800a876000, ffff88800a877000) Reject an in-page offset outside the current page before the copy. [almaz.alexandrovich@paragon-software.com: replaced the >= sign with >]
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 , < df099bfdb57773ba7f40f8a9dcc82e75af277922 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 1b2d31f1083beb80c55d1152249f652c1445a559 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 700973cc65db405bde0368ccf88699390150943e (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 49f7cbc902b08b56eb7d2633163ecc57a0e7145a (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 74a83aa05f73033af719771ab1f0c269928b4865 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < de603b9d377fab57a5e6432fa84a9f36b32c1636 (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: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 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: fix out-of-bounds read in read_log_rec_buf()\n\nread_log_rec_buf() copies a log record into a caller buffer starting at\n\n\tu32 off = lsn_to_page_off(log, lsn) + log-\u003erecord_header_len;\n\nlog-\u003erecord_header_len (and log-\u003edata_off, used for the following pages)\ncomes verbatim from the on-disk restart area and is only checked for\n8-byte alignment in is_rst_area_valid(), so off can exceed\nlog-\u003epage_size. \"tail = log-\u003epage_size - off\" then underflows and\nmemcpy() reads past the page_size-sized buffer returned by\nread_log_page(), spilling adjacent slab memory into the replay buffer.\n\nThis is reachable by mounting a crafted NTFS image:\n\n BUG: KASAN: slab-out-of-bounds in read_log_rec_buf+0x216/0x580\n Read of size 64 at addr ffff88800a877ff8 by task exploit/127\n  read_log_rec_buf fs/ntfs3/fslog.c:2299\n  log_replay fs/ntfs3/fslog.c:4216\n  ntfs_loadlog_and_replay fs/ntfs3/fsntfs.c:324\n  ntfs_fill_super fs/ntfs3/super.c:1392\n  get_tree_bdev_flags fs/super.c:1694\n  __x64_sys_mount fs/namespace.c:4360\n The buggy address is located 4088 bytes to the right of\n the 4096-byte region [ffff88800a876000, ffff88800a877000)\n\nReject an in-page offset outside the current page before the copy.\n\n[almaz.alexandrovich@paragon-software.com: replaced the \u003e= sign with \u003e]"
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The OOB read is reached only while mounting a local NTFS volume (path_mount\u2192ntfs_fill_super\u2192ntfs_loadlog_and_replay\u2192log_replay\u2192read_rst_area/find_log_rec\u2192read_log_rec_buf). ksmbd/nfsd never parse $LogFile; journal replay runs at fill_super, not while serving exported files.\nAC:L - rec_hdr_len and data_off in the on-disk restart area are attacker-controlled and only checked for 8-byte alignment, so off=lsn_to_page_off()+record_header_len (and later data_off) can exceed page_size. The u32 tail underflow and memcpy past the kmalloc(page_size) log page are 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, automotive, 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.\nS:U - The slab out-of-bounds read 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 - memcpy() copies attacker-chosen client_data_len bytes from past the page_size log-page slab into the replay buffer, spilling adjacent heap. client_data_len is only bounded by kmalloc success on the restart-area path, so this is an unbounded heap OOB read (Confidentiality High), not a few-byte leak.\nI:H - With a valid rec_hdr_len and oversized data_off, multi-page log records keep an attacker-controlled LOG_REC_HDR then fill the rest from adjacent slab (including same-size log pages from the crafted image). do_action then memmove()s that buffer into kmalloc\u0027d MFT and index objects, yielding kernel writes from attacker-influenced heap contents.\nA:H - An oversized rec_hdr_len or data_off plus a large client_data_len drives memcpy() far past the 4KiB log-page allocation into unmapped slab or guard pages, causing a kernel oops or panic on mount. The crash is repeatable on every mount of the crafted NTFS volume."
            }
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        "dateUpdated": "2026-09-16T14:38:32.420Z",
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          "url": "https://git.kernel.org/stable/c/de603b9d377fab57a5e6432fa84a9f36b32c1636"
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      ],
      "title": "fs/ntfs3: fix out-of-bounds read in read_log_rec_buf()",
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    "cveId": "CVE-2026-89781",
    "datePublished": "2026-09-16T08:48:20.425Z",
    "dateReserved": "2026-09-11T19:38:34.765Z",
    "dateUpdated": "2026-09-16T14:38:32.420Z",
    "state": "PUBLISHED"
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buffer.\\n\\nThis is reachable by mounting a crafted NTFS image:\\n\\n BUG: KASAN: slab-out-of-bounds in read_log_rec_buf+0x216/0x580\\n Read of size 64 at addr ffff88800a877ff8 by task exploit/127\\n  read_log_rec_buf fs/ntfs3/fslog.c:2299\\n  log_replay fs/ntfs3/fslog.c:4216\\n  ntfs_loadlog_and_replay fs/ntfs3/fsntfs.c:324\\n  ntfs_fill_super fs/ntfs3/super.c:1392\\n  get_tree_bdev_flags fs/super.c:1694\\n  __x64_sys_mount fs/namespace.c:4360\\n The buggy address is located 4088 bytes to the right of\\n the 4096-byte region [ffff88800a876000, ffff88800a877000)\\n\\nReject an in-page offset outside the current page before the copy.\\n\\n[almaz.alexandrovich@paragon-software.com: replaced the \u003e= sign with \u003e]\"}],\"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\":\"df099bfdb57773ba7f40f8a9dcc82e75af277922\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"1b2d31f1083beb80c55d1152249f652c1445a559\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"700973cc65db405bde0368ccf88699390150943e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"49f7cbc902b08b56eb7d2633163ecc57a0e7145a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"74a83aa05f73033af719771ab1f0c269928b4865\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"de603b9d377fab57a5e6432fa84a9f36b32c1636\",\"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\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.6\",\"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/1b2d31f1083beb80c55d1152249f652c1445a559\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/49f7cbc902b08b56eb7d2633163ecc57a0e7145a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53e56f7aa1d0f950a8bc2e4cdb3ba9fe45967531\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/700973cc65db405bde0368ccf88699390150943e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74a83aa05f73033af719771ab1f0c269928b4865\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de603b9d377fab57a5e6432fa84a9f36b32c1636\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df099bfdb57773ba7f40f8a9dcc82e75af277922\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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