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

Vulnerability from cvelistv5 – Published: 2026-09-16 08:48 – Updated: 2026-09-16 08:48
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
No CVSS data available.
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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{
  "containers": {
    "cna": {
      "affected": [
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "version": "5.15"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
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              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.15",
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          "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]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T08:48:20.425Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/df099bfdb57773ba7f40f8a9dcc82e75af277922"
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        },
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          "url": "https://git.kernel.org/stable/c/de603b9d377fab57a5e6432fa84a9f36b32c1636"
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      ],
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89781",
    "datePublished": "2026-09-16T08:48:20.425Z",
    "dateReserved": "2026-09-11T19:38:34.765Z",
    "dateUpdated": "2026-09-16T08:48:20.425Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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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 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  }
}



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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.

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.