CVE-2026-64399

Katalog CVE

CVSS 9.8 · Critical EPSS 0,72%

Kerentanan pada linux kernel. Skor CVSS 3.1 9.8 (Critical) menurut CNA.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE The FSCTL_DUPLICATE_EXTENTS_TO_FILE arm of smb2_ioctl() overwrites the destination file's data via vfs_clone_file_range() with neither the share-level KSMBD_TREE_CONN_FLAG_WRITABLE check nor a per-handle fp->daccess check that the other write-bearing arms carry. A client can overwrite destination data on a read-only share, or from a handle opened with only FILE_WRITE_ATTRIBUTES (which still yields an FMODE_WRITE filp). FILE_WRITE_ATTRIBUTES-only destination handle overwrote the file's data via the clone. Add both checks, matching the FSCTL_SET_SPARSE permission fix; require FILE_WRITE_DATA since this writes data.

Rincian

Terbit di NVD

25 Juli 2026

Terakhir diubah

4 September 2026

Status NVD

Analyzed

CVSS 3.1

9.8 (Critical), sumber CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

EPSS (30 hari)

0,72% peluang dieksploitasi; lebih tinggi dari 52,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/388e4139db27a9e3612c9d356b826f5b1ff6a9e3 patch
• https://git.kernel.org/stable/c/620d133d469295ee7c017ca6aafac335f65c4a5a patch
• https://git.kernel.org/stable/c/9b9cf7e65cbeaae1b6636144bacee611cdd7a5d6 patch
• https://git.kernel.org/stable/c/baae7b39673ec21073a25e3d14f8feaada01d5df patch
• https://git.kernel.org/stable/c/bf460ad5958d506492de4524a656439da3f99c51 patch
• https://git.kernel.org/stable/c/c917e4522d251071dde9871b9142d8ea1186ebfe patch