CVE-2026-97439

Status: UPDATED  |  Advisory ID: CVE-2026-97439

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: preserve non-DOS attribute bits in system.dos_attrib

[BUG]

A corrupted ntfs3 image can hit a NULL function pointer call in

generic_perform_write() after toggling system.ntfs_attrib and then

overwriting system.dos_attrib on the same file.

BUG: kernel NULL pointer dereference, address: 0000000000000000

\#PF: supervisor instruction fetch in kernel mode

\#PF: error_code(0x0010) - not-present page

PGD bed5067 P4D bed5067 PUD 0

Oops: Oops: 0010 [#1] SMP KASAN NOPTI

RIP: 0010:0x0

Code: Unable to access opcode bytes at 0xffffffffffffffd6.

RSP: 0018:ffff88801025f988 EFLAGS: 00010246

Call Trace:

generic_perform_write+0x409/0x8c0 mm/filemap.c:4255

__generic_file_write_iter+0x1bb/0x200 mm/filemap.c:4372

ntfs_file_write_iter+0xcd9/0x1c20 fs/ntfs3/file.c:1253

new_sync_write fs/read_write.c:593 [inline]

vfs_write+0x63b/0xf70 fs/read_write.c:686

ksys_write+0x133/0x250 fs/read_write.c:738

__do_sys_write fs/read_write.c:749 [inline]

__se_sys_write fs/read_write.c:746 [inline]

__x64_sys_write+0x77/0xc0 fs/read_write.c:746

...

[CAUSE]

system.ntfs_attrib updates ATTR_DATA flags via ni_new_attr_flags()

and switches i_mapping->a_ops to ntfs_aops_cmpr when

FILE_ATTRIBUTE_COMPRESSED is set. system.dos_attrib then overwrites

ni->std_fa from a one-byte DOS attribute value, clearing the compression

bit without updating ATTR_DATA or the mapping operations.

Old buffered writes use is_compressed(ni) to choose

__generic_file_write_iter(). That leaves generic_perform_write() calling

a NULL write_begin callback from ntfs_aops_cmpr.

[FIX]

Treat system.dos_attrib as a low-byte DOS attribute update and preserve the

existing non-DOS attribute bits in ni->std_fa. This keeps compressed and

sparse state consistent with ATTR_DATA and the mapping operations while

keeping the existing DOS attribute semantics intact. (NVD)

What to Do

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

References