CVE-2026-64534 is a vulnerability in Linux Kernel
Published on July 27, 2026
nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
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().
Products Associated with CVE-2026-64534
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c7874dad84b20433c0fe3919f291a762d40de08b is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below d306da8833e75f669d93424fd84940236f3850bc is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 2ed3c9d955e8cd6361f130623baa664a75fb345f is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 4606467a75cfc16721937272ed29462a750b60c8 is affected.
- Before 5.10.261 is affected.
- Before 5.15.212 is affected.
- Before 6.1.178 is affected.
- Before 6.6.145 is affected.
- Before 6.12.97 is affected.
- Before 6.18.40 is affected.
- Version 5.10.261, <= 5.10.* is unaffected.
- Version 5.15.212, <= 5.15.* is unaffected.
- Version 6.1.178, <= 6.1.* is unaffected.
- Version 6.6.145, <= 6.6.* is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.40, <= 6.18.* is unaffected.
- Version 7.1, <= * is unaffected.