CVE-2026-98171
Açıklama (NVD)
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs Fix several related bounds checking and pointer lifecycle issues in receive_encrypted_standard()'s handling of compound encrypted frames: - Clear next_buffer after assigning it to server->bigbuf. A stale next_buffer pointer can lead to a use-after-free on subsequent error paths. - Update pdu_length to the decrypted plaintext size (buf_size). Using the pre-decryption length allows NextCommand to point into stale ciphertext residue. - Reject next_cmd values smaller than MID_HEADER_SIZE(server). - Fix an integer overflow in the upper bound check by verifying pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the trailing slice is large enough for a header.
Yayın: 06.10.2026 · Son değişiklik: 30.10.2026
CVSS 3.1 metrikleri
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
| Saldırı vektörü | Ağ (uzaktan) |
| Karmaşıklık | Düşük |
| Gereken yetki | Yok |
| Kullanıcı etkileşimi | Gerekli |
| Kapsam | Değişmez |
| Gizlilik | Yüksek |
| Bütünlük | Yüksek |
| Erişilebilirlik | Yüksek |
Hesaplanan temel puan: 8.8. CVSS hesaplayıcıda incele
Referanslar
- https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1
- https://git.kernel.org/stable/c/1ed29f7a03417b405f38c09cfe04124883127b53
- https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803
- https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4
- https://git.kernel.org/stable/c/7f022867ec9f0166a0b4400385bb601b1c6b2c75
- https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78
- https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf
- https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a