CVE-2025-38527

Katalog CVE

CVSS 7.8 · High EPSS 0,41%

Kerentanan Use After Free pada linux kernel, debian linux. Skor CVSS 3.1 7.8 (High) menurut NVD.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-after-free in cifs_oplock_break A race condition can occur in cifs_oplock_break() leading to a use-after-free of the cinode structure when unmounting: cifs_oplock_break() _cifsFileInfo_put(cfile) cifsFileInfo_put_final() cifs_sb_deactive() [last ref, start releasing sb] kill_sb() kill_anon_super() generic_shutdown_super() evict_inodes() dispose_list() evict() destroy_inode() call_rcu(&inode->i_rcu, i_callback) spin_lock(&cinode->open_file_lock) <- OK [later] i_callback() cifs_free_inode() kmem_cache_free(cinode) spin_unlock(&cinode->open_file_lock) <- UAF cifs_done_oplock_break(cinode) <- UAF The issue occurs when umount has already released its reference to the superblock. When _cifsFileInfo_put() calls cifs_sb_deactive(), this releases the last reference, triggering the immediate cleanup of all inodes under RCU. However, cifs_oplock_break() continues to access the cinode after this point, resulting in use-after-free. Fix this by holding an extra reference to the superblock during the entire oplock break operation. This ensures that the superblock and its inodes remain valid until the oplock break completes.

Rincian

Terbit di NVD

16 Agustus 2025

Terakhir diubah

30 Juli 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-416: Use After Free

EPSS (30 hari)

0,41% peluang dieksploitasi; lebih tinggi dari 33,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/09bce2138a30ef10d8821c8c3f73a4ab7a5726bc patch
• https://git.kernel.org/stable/c/0a4eec84d4d2c4085d4ed8630fd74e4b39033c1b patch
• https://git.kernel.org/stable/c/2baaf5bbab2ac474c4f92c10fcb3310f824db995 patch
• https://git.kernel.org/stable/c/4256a483fe58af66a46cbf3dc48ff26e580d3308 patch
• https://git.kernel.org/stable/c/705c79101ccf9edea5a00d761491a03ced314210 patch
• https://git.kernel.org/stable/c/da11bd4b697b393a207f19a2ed7d382a811a3ddc patch
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html mailing list · advisory pihak ketiga