Heimdall Security Logo

CVE-2025-38527

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.4%
Linux•Linux•Versions : 6.1.147, <=6.1.*, <=6.12.*, 6.6.100, 0, <09bce2138a30ef10d8821c8c3f73a4ab7a5726bc, 4.19.37, <4.10, <=6.15.*, ebac4d0adf68f8962bd82fcf483936edd6ec095b, <2baaf5bbab2ac474c4f92c10fcb3310f824db995, <705c79101ccf9edea5a00d761491a03ced314210, <4.20, 6.15.8, <da11bd4b697b393a207f19a2ed7d382a811a3ddc, <=6.6.*, 5.15.190, 4.9.171, <5.1, 6.16, 4.14.114, <4256a483fe58af66a46cbf3dc48ff26e580d3308, 5.1, 53fc31a4853e30d6e8f142b824f724da27ff3e40, 2429fcf06d3cb962693868ab0a927c9038f12a2d, 6.12.40, <=*, 5.0.10, <=5.15.*, <0a4eec84d4d2c4085d4ed8630fd74e4b39033c1b, b98749cac4a695f084a5ff076f4510b23e353ecd, 8092ecc306d81186a64cda42411121f4d35aaff4, <3.17, 1ee4f2d7cdcd4508cc3cbe3b2622d7177b89da12, <4.15, 3.16.72

Description

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.

Gravité et risque d'exploitation

CVE-2025-38527 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.43 %, ce qui la place devant 36.0 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.1.147, <=6.1.*, <=6.12.*, 6.6.100, 0, <09bce2138a30ef10d8821c8c3f73a4ab7a5726bc, 4.19.37, <4.10, <=6.15.*, ebac4d0adf68f8962bd82fcf483936edd6ec095b, <2baaf5bbab2ac474c4f92c10fcb3310f824db995, <705c79101ccf9edea5a00d761491a03ced314210, <4.20, 6.15.8, <da11bd4b697b393a207f19a2ed7d382a811a3ddc, <=6.6.*, 5.15.190, 4.9.171, <5.1, 6.16, 4.14.114, <4256a483fe58af66a46cbf3dc48ff26e580d3308, 5.1, 53fc31a4853e30d6e8f142b824f724da27ff3e40, 2429fcf06d3cb962693868ab0a927c9038f12a2d, 6.12.40, <=*, 5.0.10, <=5.15.*, <0a4eec84d4d2c4085d4ed8630fd74e4b39033c1b, b98749cac4a695f084a5ff076f4510b23e353ecd, 8092ecc306d81186a64cda42411121f4d35aaff4, <3.17, 1ee4f2d7cdcd4508cc3cbe3b2622d7177b89da12, <4.15, 3.16.72) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

Rechercher une autre CVE