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CVE-2026-89607

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 2.6.19, 5.15.221, <2cd21340163494d312836c77c9fbfe2530b3d075, <a419c9ebfc9a40ee56aaad6dc68bfd67d400817b, 0, 5.10.270, 7.2.4, 6.1.188, <=5.10.*, <=6.6.*, 6.6.157, 237fead619984cc48818fe12ee0ceada3f55b012, <14cb36a500a5a3afbc955dbf69dabc565f1a3b26, <2.6.19, <=6.18.*, <=7.2.*, <33e050cac841498b5175f0f385eee903fd98863c, <ccd13eff0e7356d2aa28b127b577e4e5ad4563f5, <e2152d491ae62d96a32ed59778680a242af1fbc6, <d2802414081184f79a619ede178aeef3aa989793, <5babe9c177c364521e3e682b949c5a8c47f4a441, <=*, <=5.15.*, 6.18.50, 6.12.109, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet parse_tag_3_packet() set encrypted_key_size from the Tag 3 packet body without bounding it against ECRYPTFS_MAX_KEY_BYTES (64). When encrypted_key_size > 64, decrypt_passphrase_encrypted_session_key() sets decrypted_key_size = encrypted_key_size and performs two out-of-bounds writes: 1. crypto_skcipher_decrypt() writes encrypted_key_size bytes into decrypted_key[64] via scatterlist, overflowing into the parent ecryptfs_auth_tok struct. 2. memcpy(crypt_stat->key, decrypted_key, decrypted_key_size) writes into crypt_stat->key[64], corrupting root_iv, keysig_list, and mutexes in ecryptfs_crypt_stat. Only AES-192 (cipher code 0x08) enables this because it sets crypt_stat->key_size = 24 independently of encrypted_key_size, allowing crypto_skcipher_setkey() to succeed while encrypted_key_size exceeds ECRYPTFS_MAX_KEY_BYTES. The PKI decryption path (parse_tag_65_packet) already validates decrypted_key_size <= ECRYPTFS_MAX_KEY_BYTES; the passphrase path omits this check. Bound encrypted_key_size against ECRYPTFS_MAX_KEY_BYTES (64) rather than ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES (512). The 64-byte limit also protects the 512-byte encrypted_key[] buffer, so the former 512-byte check is removed as redundant. [tyhicks: Adjust the code comment to refer to macros representing the buffer sizes rather than mentioning the buffer size values since they may change in the future]

Gravité et risque d'exploitation

CVE-2026-89607 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 2.6.19, 5.15.221, <2cd21340163494d312836c77c9fbfe2530b3d075, <a419c9ebfc9a40ee56aaad6dc68bfd67d400817b, 0, 5.10.270, 7.2.4, 6.1.188, <=5.10.*, <=6.6.*, 6.6.157, 237fead619984cc48818fe12ee0ceada3f55b012, <14cb36a500a5a3afbc955dbf69dabc565f1a3b26, <2.6.19, <=6.18.*, <=7.2.*, <33e050cac841498b5175f0f385eee903fd98863c, <ccd13eff0e7356d2aa28b127b577e4e5ad4563f5, <e2152d491ae62d96a32ed59778680a242af1fbc6, <d2802414081184f79a619ede178aeef3aa989793, <5babe9c177c364521e3e682b949c5a8c47f4a441, <=*, <=5.15.*, 6.18.50, 6.12.109, 7.3) 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

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