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CVE-2026-43491— net: qrtr: ns: Limit the maximum server registration per node

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未对每个节点添加的服务器数量进行边界检查，恶意客户端可发送NEW_SERVER消息导致内存耗尽。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0c2204a4ad710d95d348ea006f14ba926e842ffd< b48fc702b20233b809f01053232c3cd5083c97b4 affected
0c2204a4ad710d95d348ea006f14ba926e842ffd< 991c431077b19176d3fe3bb54054c063776a8cdc affected
0c2204a4ad710d95d348ea006f14ba926e842ffd< 94914731ca0b99899dceadd80d2df00584a688ca affected
0c2204a4ad710d95d348ea006f14ba926e842ffd< e6f6cd501fb54060940a6eb3f4103eeb5e426ae7 affected
0c2204a4ad710d95d348ea006f14ba926e842ffd< 3efaad55cad1ded429e3a873bfece389058a526b affected
0c2204a4ad710d95d348ea006f14ba926e842ffd< 35fb4a0c077c5d1049c2628b769e0a1b1e65df0d affected
0c2204a4ad710d95d348ea006f14ba926e842ffd< 868202aa2adae427060a42d5bd663b4d782ec02c affected
0c2204a4ad710d95d348ea006f14ba926e842ffd< d5ee2ff98322337951c56398e79d51815acbf955 affected
… +10 more rows
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I. Basic Information for CVE-2026-43491

Vulnerability Information
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Vulnerability Title
net: qrtr: ns: Limit the maximum server registration per node
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: qrtr: ns: Limit the maximum server registration per node Current code does no bound checking on the number of servers added per node. A malicious client can flood NEW_SERVER messages and exhaust memory. Fix this issue by limiting the maximum number of server registrations to 256 per node. If the NEW_SERVER message is received for an old port, then don't restrict it as it will get replaced. While at it, also rate limit the error messages in the failure path of qrtr_ns_worker(). Note that the limit of 256 is chosen based on the current platform requirements. If requirement changes in the future, this limit can be increased.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未对每个节点添加的服务器数量进行边界检查，恶意客户端可发送NEW_SERVER消息导致内存耗尽。
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 0c2204a4ad710d95d348ea006f14ba926e842ffd ~ b48fc702b20233b809f01053232c3cd5083c97b4 -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-43491

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III. Intelligence Information for CVE-2026-43491

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Patches & Fixes for CVE-2026-43491 (8)

Same Patch Batch · Linux · 2026-05-19 · 3 CVEs total

CVE-2026-43493 9.8 CRITICAL crypto: pcrypt - Fix handling of MAY_BACKLOG requests
CVE-2026-43492 lib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43491

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