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CVE-2026-89782 (GCVE-0-2026-89782)

Vulnerability from cvelistv5 – Published: 2026-09-16 08:48 – Updated: 2026-09-16 14:38
VLAI
Title
fs/ntfs3: reject restart table growth beyond U16_MAX entries
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject restart table growth beyond U16_MAX entries During $LogFile replay, log_replay() indexes the transaction table by the transact_id taken from the log record header. check_log_rec() only verifies that transact_id is non-zero and properly aligned, not its magnitude, so a crafted image can request an arbitrarily large index. alloc_rsttbl_from_idx() grows the table to cover that index via extend_rsttbl(), which passes the new entry count to init_rsttbl(): rt = init_rsttbl(esize, used + add); used + add is computed as u32 but init_rsttbl() takes a u16, and the count is stored in struct RESTART_TABLE as a __le16. When used + add exceeds U16_MAX it is truncated, init_rsttbl() allocates a table far smaller than the index requires, and alloc_rsttbl_from_idx() then dereferences and writes at the original, untruncated offset -- an out-of-bounds access past the allocation, reachable by mounting a crafted NTFS image. BUG: KASAN: use-after-free in alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950) Read of size 4 at addr ffff8880327ffff8 by task exploit alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950) log_replay (fs/ntfs3/fslog.c:4562) ntfs_loadlog_and_replay (fs/ntfs3/fsntfs.c:324) ntfs_fill_super (fs/ntfs3/super.c:1393) get_tree_bdev_flags vfs_get_tree path_mount __x64_sys_mount A restart table is limited to U16_MAX entries by its __le16 count, so a larger growth request is invalid input. Reject it in extend_rsttbl(); all callers already handle a NULL return.
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 , < caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 339e59996ff193adcf1c438cf05f19e753beb3a7 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < ecde45cd81dc28f5696c312c5ce5a509962e9ab1 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < be218a01aadffe33ed4fc73e25276d676ebbd09d (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < aad605a450611e2a7b7cf9dd5724004d39192bfb (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 967a5ff8a614d10126b6d46db1ac040948d6cb42 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 111f8d74a19d85942ecbb3aba78f6f3c88e59391 (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: reject restart table growth beyond U16_MAX entries\n\nDuring $LogFile replay, log_replay() indexes the transaction table by the\ntransact_id taken from the log record header.  check_log_rec() only\nverifies that transact_id is non-zero and properly aligned, not its\nmagnitude, so a crafted image can request an arbitrarily large index.\n\nalloc_rsttbl_from_idx() grows the table to cover that index via\nextend_rsttbl(), which passes the new entry count to init_rsttbl():\n\n\trt = init_rsttbl(esize, used + add);\n\nused + add is computed as u32 but init_rsttbl() takes a u16, and the\ncount is stored in struct RESTART_TABLE as a __le16.  When used + add\nexceeds U16_MAX it is truncated, init_rsttbl() allocates a table far\nsmaller than the index requires, and alloc_rsttbl_from_idx() then\ndereferences and writes at the original, untruncated offset -- an\nout-of-bounds access past the allocation, reachable by mounting a\ncrafted NTFS image.\n\n BUG: KASAN: use-after-free in alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\n Read of size 4 at addr ffff8880327ffff8 by task exploit\n  alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\n  log_replay (fs/ntfs3/fslog.c:4562)\n  ntfs_loadlog_and_replay (fs/ntfs3/fsntfs.c:324)\n  ntfs_fill_super (fs/ntfs3/super.c:1393)\n  get_tree_bdev_flags\n  vfs_get_tree\n  path_mount\n  __x64_sys_mount\n\nA restart table is limited to U16_MAX entries by its __le16 count, so a\nlarger growth request is invalid input.  Reject it in extend_rsttbl();\nall callers already handle a NULL return."
        }
      ],
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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"
          },
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              "lang": "en",
              "value": "AV:L - The bug is reached only while mounting a local NTFS block or loop device: path_mount \u2192 ntfs_fill_super \u2192 ntfs_loadlog_and_replay \u2192 log_replay \u2192 alloc_rsttbl_from_idx. ksmbd/nfsd never parse $LogFile; journal replay runs at fill_super, not while serving exported files.\nAC:L - The attacker fully controls on-disk $LogFile LFS_RECORD_HDR.transact_id. check_log_rec() only requires it non-zero and TRANSACTION_ENTRY-aligned, so a crafted index with used+add \u003e U16_MAX truncates init_rsttbl() and hits the OOB access deterministically on mount 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 to trigger the overflow.\nS:U - Heap out-of-bounds access and use-after-free occur 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 - After the truncated allocation, alloc_rsttbl_from_idx() reads a restart-table word at the original untruncated transact_id offset (KASAN use-after-free). That attacker-chosen heap index plus UAF of the freed old table enable arbitrary kernel memory disclosure.\nI:H - extend_rsttbl() memcpy\u0027s the old table into a truncated kmalloc buffer, then alloc_rsttbl_from_idx() memset\u0027s and writes RESTART_ENTRY_ALLOCATED at the untruncated offset, producing an OOB/UAF heap write that can corrupt adjacent slab objects for control-flow hijacking.\nA:H - KASAN reported use-after-free in alloc_rsttbl_from_idx() on mount of a crafted NTFS image; the out-of-bounds heap access during log replay can oops or panic the kernel and is repeatable on every mount of the malicious volume."
            }
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        "dateUpdated": "2026-09-16T14:38:33.748Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "fs/ntfs3: reject restart table growth beyond U16_MAX entries",
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    "datePublished": "2026-09-16T08:48:21.093Z",
    "dateReserved": "2026-09-11T19:38:34.765Z",
    "dateUpdated": "2026-09-16T14:38:33.748Z",
    "state": "PUBLISHED"
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When used + add\\nexceeds U16_MAX it is truncated, init_rsttbl() allocates a table far\\nsmaller than the index requires, and alloc_rsttbl_from_idx() then\\ndereferences and writes at the original, untruncated offset -- an\\nout-of-bounds access past the allocation, reachable by mounting a\\ncrafted NTFS image.\\n\\n BUG: KASAN: use-after-free in alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\\n Read of size 4 at addr ffff8880327ffff8 by task exploit\\n  alloc_rsttbl_from_idx (fs/ntfs3/fslog.c:950)\\n  log_replay (fs/ntfs3/fslog.c:4562)\\n  ntfs_loadlog_and_replay (fs/ntfs3/fsntfs.c:324)\\n  ntfs_fill_super (fs/ntfs3/super.c:1393)\\n  get_tree_bdev_flags\\n  vfs_get_tree\\n  path_mount\\n  __x64_sys_mount\\n\\nA restart table is limited to U16_MAX entries by its __le16 count, so a\\nlarger growth request is invalid input.  Reject it in extend_rsttbl();\\nall callers already handle a NULL return.\"}],\"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\":\"caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"339e59996ff193adcf1c438cf05f19e753beb3a7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"ecde45cd81dc28f5696c312c5ce5a509962e9ab1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"be218a01aadffe33ed4fc73e25276d676ebbd09d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"aad605a450611e2a7b7cf9dd5724004d39192bfb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"967a5ff8a614d10126b6d46db1ac040948d6cb42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"111f8d74a19d85942ecbb3aba78f6f3c88e59391\",\"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/111f8d74a19d85942ecbb3aba78f6f3c88e59391\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/339e59996ff193adcf1c438cf05f19e753beb3a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/967a5ff8a614d10126b6d46db1ac040948d6cb42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aad605a450611e2a7b7cf9dd5724004d39192bfb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be218a01aadffe33ed4fc73e25276d676ebbd09d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ecde45cd81dc28f5696c312c5ce5a509962e9ab1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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