CVE-2026-89782

Status: UPDATED  |  Advisory ID: CVE-2026-89782

Key Details

Affected Products, Subsystems & Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References