CVE-2026-64534nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 91edfca6f8b364d60cde3ddefaf7d03ddf35774b builds before 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf; from fda871c0ba5d2eed2cd1c881573168129da70058 before ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e; from fda871c0ba5d2eed2cd1c881573168129da70058 before c7874dad84b20433c0fe3919f291a762d40de08b; from fda871c0ba5d2eed2cd1c881573168129da70058 before e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1; from fda871c0ba5d2eed2cd1c881573168129da70058 before d306da8833e75f669d93424fd84940236f3850bc; from fda871c0ba5d2eed2cd1c881573168129da70058 before 2ed3c9d955e8cd6361f130623baa664a75fb345f; from fda871c0ba5d2eed2cd1c881573168129da70058 before 4606467a75cfc16721937272ed29462a750b60c8; 4b17476d809273617d3317fa0d4ae78aa488d760; and 2 more ranges | CNA record |
References
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.