CVE-2026-64535
Açıklama (NVD)
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: Fix potential UAF when ddgst mismatch Shivam Kumar found via vulnerability testing: When data digest is enabled on an NVMe/TCP connection and a digest mismatch occurs on a non-final H2C_DATA PDU during an R2T-based data transfer, the digest error handler in nvmet_tcp_try_recv_ddgst() calls nvmet_req_uninit() — which performs percpu_ref_put() on the submission queue — but does NOT mark the command as completed. It does not set cqe->status, does not modify rbytes_done, and does not clear any flag. When the subsequent fatal error triggers queue teardown, nvmet_tcp_uninit_data_in_cmds() iterates all commands, checks nvmet_tcp_need_data_in() for each one, and finds that the already-uninited command still appears to need data (because rbytes_done < transfer_len and cqe->status == 0). It therefore calls nvmet_req_uninit() a second time on the same command — a double percpu_ref_put against a single percpu_ref_get.
Yayın: 27.07.2026 · Son değişiklik: 03.11.2026 · Zayıflık: CWE-415
CVSS 3.1 metrikleri
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
| Saldırı vektörü | Ağ (uzaktan) |
| Karmaşıklık | Düşük |
| Gereken yetki | Yok |
| Kullanıcı etkileşimi | Gerekmez |
| Kapsam | Değişmez |
| Gizlilik | Yüksek |
| Bütünlük | Yüksek |
| Erişilebilirlik | Yüksek |
Hesaplanan temel puan: 9.8. CVSS hesaplayıcıda incele
Referanslar
- https://git.kernel.org/stable/c/088ee46c18d99baef453afd74181dd40ade044ad
- https://git.kernel.org/stable/c/6f9442983a3e4227afd1c83a5251ddbca585ea21
- https://git.kernel.org/stable/c/7e558308eba14c8136cb1e615f0c850f76d1fc0a
- https://git.kernel.org/stable/c/96fe2513df590e74b04253a45089cae75569570e
- https://git.kernel.org/stable/c/dbbd07d0a7020b80f6a7028e561908f7b83b3d5a
- https://git.kernel.org/stable/c/dfb902462bca478f050224ec7a7195aafa7643b1
- https://git.kernel.org/stable/c/e091ff83d962f9ed00d9bd70443676de9fe98bdc