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Vulnerability record · CVE-2026-52989 · published 24 June 2026

CVE-2026-52989: Linux kernel use of uninitialized resource vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers Currently, when nvmet_tcp_build_pdu_iovec() detects an out-of-bounds PDU length or offset, it triggers nvmet_tcp_fatal_error(cmd->queue) and returns early. However, because the function returns void, the callers are entirely unaware that a fatal error has occurred and that the cmd->recv_msg.msg_iter was left uninitialized. Callers such as nvmet_tcp_handle_h2c_data_pdu() proceed to blindly overwrite the queue state with queue->rcv_state = NVMET_TCP_RECV_DATA Consequently, the socket receiving loop may attempt to read incoming network data into the uninitialized iterator. Fix this by shifting the error handling responsibility to the callers.

9.8 CVSS 3.1 Critical EPSS 0.51% · top 58.8% CWE-908 · Use of uninitialized resourceCWE-390 · CWE-390
9.8CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
21 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers Currently, when nvmet_tcp_build_pdu_iovec() detects an out-of-bounds PDU length or offset, it triggers nvmet_tcp_fatal_error(cmd->queue) and returns early. However, because the function returns void, the callers are entirely unaware that a fatal error has occurred and that the cmd->recv_msg.msg_iter was left uninitialized. Callers such as nvmet_tcp_handle_h2c_data_pdu() proceed to blindly overwrite the queue state with queue->rcv_state = NVMET_TCP_RECV_DATA Consequently, the socket receiving loop may attempt to read incoming network data into the uninitialized iterator. Fix this by shifting the error handling responsibility to the callers.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/046fa5c72d15cd8e2d592e275697ea399d8f76b0 Patch
https://git.kernel.org/stable/c/3df42a854686fa06484e37ac1a3931c8e3e3453c Patch
https://git.kernel.org/stable/c/c2a11441538bdbbc5aa003f190995eba93a89b88 Patch
https://git.kernel.org/stable/c/d7c8f95f599b3b38a717d2e771c3f8c174f657c3 Patch
https://git.kernel.org/stable/c/ea8e356acb165cb1fd75537a52e1f66e5e76c538 Patch
https://git.kernel.org/stable/c/f9204a2b78dd18374d3bcf9bf93d9021ce22de1b Patch
https://access.redhat.com/security/cve/CVE-2026-52989 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2492443 Issue TrackingThird Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52989.json Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-52989), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.