Answer in brief
CVE-2026-43491 records a Medium severity (CVSS 5.5) vulnerability in net: qrtr: ns: Limit the maximum server registration per node. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0c2204a4ad710d95d348ea006f14ba926e842ffd <e6f6cd501fb54060940a6eb3f4103eeb5e426ae7 || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <3efaad55cad1ded429e3a873bfece389058a526b || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <35fb4a0c077c5d1049c2628b769e0a1b1e65df0d || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <868202aa2adae427060a42d5bd663b4d782ec02c || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <d5ee2ff98322337951c56398e79d51815acbf955 | e6f6cd501fb54060940a6eb3f4103eeb5e426ae7, 3efaad55cad1ded429e3a873bfece389058a526b, 35fb4a0c077c5d1049c2628b769e0a1b1e65df0d, 868202aa2adae427060a42d5bd663b4d782ec02c, d5ee2ff98322337951c56398e79d51815acbf955 |
| Linux/Linuxgeneric | 5.7 | Not reported |
| Linux/Linuxgeneric | >=0c2204a4ad710d95d348ea006f14ba926e842ffd <b48fc702b20233b809f01053232c3cd5083c97b4 || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <991c431077b19176d3fe3bb54054c063776a8cdc || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <94914731ca0b99899dceadd80d2df00584a688ca || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <e6f6cd501fb54060940a6eb3f4103eeb5e426ae7 || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <3efaad55cad1ded429e3a873bfece389058a526b || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <35fb4a0c077c5d1049c2628b769e0a1b1e65df0d || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <868202aa2adae427060a42d5bd663b4d782ec02c || >=0c2204a4ad710d95d348ea006f14ba926e842ffd <d5ee2ff98322337951c56398e79d51815acbf955 | b48fc702b20233b809f01053232c3cd5083c97b4, 991c431077b19176d3fe3bb54054c063776a8cdc, 94914731ca0b99899dceadd80d2df00584a688ca, e6f6cd501fb54060940a6eb3f4103eeb5e426ae7, 3efaad55cad1ded429e3a873bfece389058a526b, 35fb4a0c077c5d1049c2628b769e0a1b1e65df0d, 868202aa2adae427060a42d5bd663b4d782ec02c, d5ee2ff98322337951c56398e79d51815acbf955 |
Published upstream
May 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.