Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b46acd6a6a627d876898e1c84d3f84902264b445 to < caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56affectedb46acd6a6a627d876898e1c84d3f84902264b445 to < 339e59996ff193adcf1c438cf05f19e753beb3a7affectedb46acd6a6a627d876898e1c84d3f84902264b445 to < ecde45cd81dc28f5696c312c5ce5a509962e9ab1affectedb46acd6a6a627d876898e1c84d3f84902264b445 to < be218a01aadffe33ed4fc73e25276d676ebbd09daffectedb46acd6a6a627d876898e1c84d3f84902264b445 to < aad605a450611e2a7b7cf9dd5724004d39192bfbaffectedb46acd6a6a627d876898e1c84d3f84902264b445 to < 967a5ff8a614d10126b6d46db1ac040948d6cb42affectedb46acd6a6a627d876898e1c84d3f84902264b445 to < 111f8d74a19d85942ecbb3aba78f6f3c88e59391affected
Linux Linux
Default version status: affected
5.15affected0 to < 5.15unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56 ↗
- https://git.kernel.org/stable/c/339e59996ff193adcf1c438cf05f19e753beb3a7 ↗
- https://git.kernel.org/stable/c/ecde45cd81dc28f5696c312c5ce5a509962e9ab1 ↗
- https://git.kernel.org/stable/c/be218a01aadffe33ed4fc73e25276d676ebbd09d ↗
- https://git.kernel.org/stable/c/aad605a450611e2a7b7cf9dd5724004d39192bfb ↗
- https://git.kernel.org/stable/c/967a5ff8a614d10126b6d46db1ac040948d6cb42 ↗
- https://git.kernel.org/stable/c/111f8d74a19d85942ecbb3aba78f6f3c88e59391 ↗