fs/ntfs3: reject restart table growth beyond U16_MAX entries

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89782
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 09:17:08 UTC
Updated2026-09-16 15:18:08 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002050000 probability, percentile 0.108060000 (date 2026-09-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 339e59996ff193adcf1c438cf05f19e753beb3a7 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 ecde45cd81dc28f5696c312c5ce5a509962e9ab1 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 be218a01aadffe33ed4fc73e25276d676ebbd09d git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 aad605a450611e2a7b7cf9dd5724004d39192bfb git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 967a5ff8a614d10126b6d46db1ac040948d6cb42 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 111f8d74a19d85942ecbb3aba78f6f3c88e59391 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/111f8d74a19d85942ecbb3aba78f6f3c88e59391 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/339e59996ff193adcf1c438cf05f19e753beb3a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/967a5ff8a614d10126b6d46db1ac040948d6cb42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/be218a01aadffe33ed4fc73e25276d676ebbd09d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ecde45cd81dc28f5696c312c5ce5a509962e9ab1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aad605a450611e2a7b7cf9dd5724004d39192bfb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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