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CVE-2026-89782

fs/ntfs3: reject restart table growth beyond U16_MAX entries

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, and 1 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 339e59996ff193adcf1c438cf05f19e753beb3a7; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in ecde45cd81dc28f5696c312c5ce5a509962e9ab1; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in be218a01aadffe33ed4fc73e25276d676ebbd09d; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in aad605a450611e2a7b7cf9dd5724004d39192bfb; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 967a5ff8a614d10126b6d46db1ac040948d6cb42; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 111f8d74a19d85942ecbb3aba78f6f3c88e59391

  • Linux Linux

    5.15

  • KernelLinux

    From 5.15.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 7

git.kernel.org