CVE-2026-43474

Summary

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

fs: init flags_valid before calling vfs_fileattr_get

syzbot reported a uninit-value bug in [1].

Similar to the "*get" context where the kernel's internal file_kattr structure is initialized before calling vfs_fileattr_get(), we should use the same mechanism when using fa.

[1] BUG: KMSAN: uninit-value in fuse_fileattr_get+0xeb4/0x1450 fs/fuse/ioctl.c:517 fuse_fileattr_get+0xeb4/0x1450 fs/fuse/ioctl.c:517 vfs_fileattr_get fs/file_attr.c:94 [inline] __do_sys_file_getattr fs/file_attr.c:416 [inline]

Local variable fa.i created at: __do_sys_file_getattr fs/file_attr.c:380 [inline] __se_sys_file_getattr+0x8c/0xbd0 fs/file_attr.c:372

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/379e19e820dd1c6145426b97467728b3b89c0b42
• https://git.kernel.org/stable/c/b8c182b2c8c44c6016b11d8af61715ad7ef958a1
• https://git.kernel.org/stable/c/cb184dd19154fc486fa3d9e02afe70a97e54e055

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