Vulnerability details
CVE-2026-64534
nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
Official description
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path In nvmet_tcp_try_recv_ddgst(), when a data digest mismatch is detected, nvmet_req_uninit() is called unconditionally. However, if the command arrived via the nvmet_tcp_handle_req_failure() path, nvmet_req_init() had returned false and percpu_ref_tryget_live() was never executed. The unconditional percpu_ref_put() inside nvmet_req_uninit() then causes a refcount underflow, leading to a WARNING in percpu_ref_switch_to_atomic_rcu, a use-after-free diagnostic, and eventually a permanent workqueue deadlock. Check cmd->flags & NVMET_TCP_F_INIT_FAILED before calling nvmet_req_uninit(), matching the existing pattern in nvmet_tcp_execute_request().
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 4b17476d809273617d3317fa0d4ae78aa488d760 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 5.12 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 5.10.20 ≤ v < 5.10.261 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 5.11.3 ≤ v < 5.12 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 91edfca6f8b364d60cde3ddefaf7d03ddf35774b ≤ v < 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf | CVEProject cvelistV5 (CNA) |
| Linux | Linux | fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < 2ed3c9d955e8cd6361f130623baa664a75fb345f | CVEProject cvelistV5 (CNA) |
| Linux | Linux | fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < 4606467a75cfc16721937272ed29462a750b60c8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < d306da8833e75f669d93424fd84940236f3850bc | CVEProject cvelistV5 (CNA) |
| Linux | Linux | fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < c7874dad84b20433c0fe3919f291a762d40de08b | CVEProject cvelistV5 (CNA) |
| Linux | Linux | fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e | CVEProject cvelistV5 (CNA) |
References and advisories
7- https://git.kernel.org/stable/c/22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf
- https://git.kernel.org/stable/c/ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e
- https://git.kernel.org/stable/c/c7874dad84b20433c0fe3919f291a762d40de08b
- https://git.kernel.org/stable/c/e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1
- https://git.kernel.org/stable/c/d306da8833e75f669d93424fd84940236f3850bc
- https://git.kernel.org/stable/c/2ed3c9d955e8cd6361f130623baa664a75fb345f
- https://git.kernel.org/stable/c/4606467a75cfc16721937272ed29462a750b60c8
Details
- Published
- 2026-07-27
- Last updated
- 2026-10-20
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-667Improper Locking