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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nvmet_tcp_build_pdu_iovec()函数错误处理不当导致迭代器未初始化，可能导致套接字接收循环将网络数据读入未初始化的迭代器。

CVSS 9.8 · Critical EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 1385be357e8acd09b36e026567f3a9d5c61139de< 3df42a854686fa06484e37ac1a3931c8e3e3453c affected
dca1a6ba0da9f472ef040525fab10fd9956db59f< d7c8f95f599b3b38a717d2e771c3f8c174f657c3 affected
19672ae68d52ff75347ebe2420dde1b07adca09f< f9204a2b78dd18374d3bcf9bf93d9021ce22de1b affected
ab200d71553bdcf4de554a5985b05b2dd606bc57< c2a11441538bdbbc5aa003f190995eba93a89b88 affected
52a0a98549344ca20ad81a4176d68d28e3c05a5c< 046fa5c72d15cd8e2d592e275697ea399d8f76b0 affected
52a0a98549344ca20ad81a4176d68d28e3c05a5c< ea8e356acb165cb1fd75537a52e1f66e5e76c538 affected
043b4307a99f902697349128fde93b2ddde4686c affected
42afe8ed8ad2de9c19457156244ef3e1eca94b5d affected
… +14 more rows
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I. Basic Information for CVE-2026-52989

Vulnerability Information
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Vulnerability Title
nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nvmet_tcp_build_pdu_iovec()函数错误处理不当导致迭代器未初始化，可能导致套接字接收循环将网络数据读入未初始化的迭代器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1385be357e8acd09b36e026567f3a9d5c61139de ~ 3df42a854686fa06484e37ac1a3931c8e3e3453c -
Linux Linux 6.19 -

II. Public POCs for CVE-2026-52989

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III. Intelligence Information for CVE-2026-52989

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Patches & Fixes for CVE-2026-52989 (6)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-53053 8.8 HIGH iommu/amd: Fix clone_alias() to use the original device's devid

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52989

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