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CVE-2026-89743— misc: nsm: bound the device-reported response length

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.

在 Linux 内核中，以下漏洞已得到修复： 子系统/模块：misc: nsm: 对设备上报的响应长度进行边界限制 问题描述： 函数将 NSM 设备通过 virtqueue 的 used-ring 上报的响应长度直接存入 ，但未将其限制在响应缓冲区的大小范围内。若设备（后端）行为异常或存在缺陷，可能上报一个超过响应缓冲区的长度值。随后， 会尝试将相应数量的字节从固定的缓冲区复制到用户空间，导致发生越界读取（out-of-bounds read），可能泄露相邻的内核堆内存。 对比说明： 请求路径中的 已经对长度进行了

AI Predicted 5.5 Difficulty: Moderate

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux b9873755a6c8ccfce79094c4dce9efa3ecb1a749< 339f19b9a6171289b0e797deb8bda80b9a1fcc30 affected
b9873755a6c8ccfce79094c4dce9efa3ecb1a749< 29e634a18957acda11383a15ab98a91c4ae9e294 affected
b9873755a6c8ccfce79094c4dce9efa3ecb1a749< 2aa0fb9c96f894a9c179a48e7522ea6705800adf affected
b9873755a6c8ccfce79094c4dce9efa3ecb1a749< 808e530654a5354e6df78863a5d61e4d44e67235 affected
6.8 affected
< 6.8 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-2026-89743

Vulnerability Information
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Vulnerability Title
misc: nsm: bound the device-reported response length
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: misc: nsm: bound the device-reported response length nsm_sendrecv_msg_locked() stores the virtqueue used-ring length reported by the NSM device into msg->resp.len without bounding it to the response buffer. A malicious or buggy backend can report a length larger than the response buffer; parse_resp_raw() then copies that many bytes out of the fixed buffer to user space, disclosing adjacent kernel heap (an out-of-bounds read). The request path already floors its length in fill_req_raw(); the response path lacks the symmetric check. Clamp the stored length to the size of the response buffer. Well-behaved devices report no more than the posted buffer size, so conforming traffic is unaffected.
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 b9873755a6c8ccfce79094c4dce9efa3ecb1a749 ~ 339f19b9a6171289b0e797deb8bda80b9a1fcc30 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-89743

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III. Intelligence Information for CVE-2026-89743

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Patches & Fixes for CVE-2026-89743 (4)

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

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
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-2026-89480 nvme-tcp: reject a read that transferred too few bytes
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-2026-89500 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-2026-89498 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-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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