5.5

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

Modified
AliasesUBUNTU-CVE-2026-43491DEBIAN-CVE-2026-43491
Published 19-05-2026Last modified 19-08-2026

Vulnerability summary

CVE-2026-43491 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.15%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 40 · Related 38
MGASA-2026-0174MGASA-2026-0177OPENSUSE-SU-2026:10859-1OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22433-1SUSE-SU-2026:22436-1

Timeline

  1. 19-05-2026
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.16% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu147 products
  • linux< 5.15.0-198.208 | < 6.8.0-136.136 | All versions (No fix recorded) | < 7.0.0-27.27
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1117.124 | < 6.8.0-1061.64 | All versions (No fix recorded) | < 7.0.0-1008.8
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0c2204a4ad710d95d348ea006f14ba926e842ffd, < b48fc702b20233b809f01053232c3cd5083c97b4 | ≥ 0c2204a4ad710d95d348ea006f14ba926e842ffd, < 991c431077b19176d3fe3bb54054c063776a8cdc | ≥ 0c2204a4ad710d95d348ea006f14ba926e842ffd, < 94914731ca0b99899dceadd80d2df00584a688ca | ≥ 0c2204a4ad710d95d348ea006f14ba926e842ffd, < e6f6cd501fb54060940a6eb3f4103eeb5e426ae7 | ≥ 0c2204a4ad710d95d348ea006f14ba926e842ffd, < 3efaad55cad1ded429e3a873bfece389058a526b | ≥ 0c2204a4ad710d95d348ea006f14ba926e842ffd, < 35fb4a0c077c5d1049c2628b769e0a1b1e65df0d | ≥ 0c2204a4ad710d95d348ea006f14ba926e842ffd, < 868202aa2adae427060a42d5bd663b4d782ec02c | ≥ 0c2204a4ad710d95d348ea006f14ba926e842ffd, < d5ee2ff98322337951c56398e79d51815acbf955 | 5.7
  • linux_kernel≥ 5.7, < 6.6.140 | ≥ 6.7, < 6.12.86 | ≥ 6.13, < 6.18.27 | ≥ 6.19, < 7.0.4
Debian1 product
  • linux< 6.1.187-1 | < 6.12.86-1 | < 7.0.4-1

3 vendors · 150 products

References

39 links
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