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CVE-2026-89480— nvme-tcp: reject a read that transferred too few bytes

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.

以下是该漏洞描述的中文翻译： 在 Linux 内核中，已修复以下漏洞： nvme-tcp：拒绝接收字节数过少的读取请求 在当前 C2HData PDU 被消费后便会完成请求。没有任何机制将实际接收到的总字节数与命令请求的长度进行比对： 中没有接收端的字节计数器， 是针对每个队列的，并且 无条件地根据 完成请求，整个上层代码中不存在“剩余字节”（residual）的概念。 因此，控制器可以用 512 字节来响应一个 4096 字节的读取请求，而它会被报告为一个完整的读取。随后用户空间将获得 4096 字节，其中 35

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 3f2304f8c6d6ed97849057bd16fee99e434ca796< 99066cf9bba175f610ceb61a35f6fc9fbc33ff65 affected
3f2304f8c6d6ed97849057bd16fee99e434ca796< 8a02ad98798fd01f51f648c1fdd8f3c9d07195d3 affected
3f2304f8c6d6ed97849057bd16fee99e434ca796< 832a685efeb5d925ee7d30011d2dbe45f81447a3 affected
3f2304f8c6d6ed97849057bd16fee99e434ca796< 7fa3f73f6c8ddc5f0425b50fb2a626a782ef7d12 affected
5.0 affected
< 5.0 unaffected
6.12.109≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89480

Vulnerability Information
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Vulnerability Title
nvme-tcp: reject a read that transferred too few bytes
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: reject a read that transferred too few bytes nvme_tcp_recv_data() completes a request once the current C2HData PDU has been consumed. Nothing compares the total bytes received against the length the command asked for: struct nvme_tcp_request has no receive-side counter, queue->data_remaining is per queue, and blk_mq_end_request() completes for blk_rq_bytes(rq) unconditionally with no residual concept anywhere above. A controller can therefore answer a 4096-byte read with 512 bytes and have it reported as a complete read; user space then gets 4096 bytes of which 3584 are whatever was already in the page. I reproduced that with a test target. Count the bytes received and refuse to complete a successful read whose count does not match, at the two NVME_TCP_F_DATA_SUCCESS paths and in nvme_tcp_process_nvme_cqe(). The success test shifts req->status right by one, because the driver keeps the wire value there and shifts it on completion, so the check must see what the completion path will see. Only REQ_OP_READ is checked, because there the length comes from the sectors the request covers; a passthrough command is built by its submitter, which picks both command and buffer, so the kernel has nothing to compare against.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 3f2304f8c6d6ed97849057bd16fee99e434ca796 ~ 99066cf9bba175f610ceb61a35f6fc9fbc33ff65 -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-89480

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III. Intelligence Information for CVE-2026-89480

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Other References for CVE-2026-89480 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89490 ocfs2: fix readdir position truncation on 32-bit kernels
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89502 ring-buffer: Free cpu_buffer::free_page with subbuf_order

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89480

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