Critical 9.8Published Jun 24, 2026

CVE-2026-52989nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers

Updated under an hour ago (Oct 27, 2026, 6:10 PM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 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): CWE-390
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: Modified
Record last updated: Aug 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	1385be357e8acd09b36e026567f3a9d5c61139de builds before 3df42a854686fa06484e37ac1a3931c8e3e3453c; from dca1a6ba0da9f472ef040525fab10fd9956db59f before d7c8f95f599b3b38a717d2e771c3f8c174f657c3; from 19672ae68d52ff75347ebe2420dde1b07adca09f before f9204a2b78dd18374d3bcf9bf93d9021ce22de1b; from ab200d71553bdcf4de554a5985b05b2dd606bc57 before c2a11441538bdbbc5aa003f190995eba93a89b88; 52a0a98549344ca20ad81a4176d68d28e3c05a5c builds before 046fa5c72d15cd8e2d592e275697ea399d8f76b0; from 52a0a98549344ca20ad81a4176d68d28e3c05a5c before ea8e356acb165cb1fd75537a52e1f66e5e76c538; 043b4307a99f902697349128fde93b2ddde4686c; 42afe8ed8ad2de9c19457156244ef3e1eca94b5d; and 6 more ranges	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.10.250 before 5.11; from 5.15.200 before 5.16; from 6.1.163 before 6.1.175; from 6.6.124 before 6.6.141; from 6.12.70 before 6.12.91; from 6.18.10 before 6.18.33; from 6.19.1 before 7.0.10; 6.19; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/3df42a854686fa06484e37ac1a3931c8e3e3453c	patch
https://git.kernel.org/stable/c/d7c8f95f599b3b38a717d2e771c3f8c174f657c3	patch
https://git.kernel.org/stable/c/f9204a2b78dd18374d3bcf9bf93d9021ce22de1b	patch
https://git.kernel.org/stable/c/c2a11441538bdbbc5aa003f190995eba93a89b88	patch
https://git.kernel.org/stable/c/046fa5c72d15cd8e2d592e275697ea399d8f76b0	patch
https://git.kernel.org/stable/c/ea8e356acb165cb1fd75537a52e1f66e5e76c538	patch
https://access.redhat.com/security/cve/CVE-2026-52989	third-party-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2492443	issue-tracking, third-party-advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52989.json	third-party-advisory

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.