9.8

CVE-2026-74401: linux

CVSS: 9.8v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-74401DEBIAN-CVE-2026-74401
Published 15-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74401 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.65%
0%100%
Low · +0.21 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 9
USN-8781-1USN-8816-1USN-8816-2USN-8816-3USN-8816-4USN-8888-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: dlm: fix add msg handle in send_queue ordered In a benchmark scenario triggering a lot of requests that triggers a lot of DLM messages on the network it can be that the mh->seq is not ordered according the oldest seq number. This ordering is required by dlm_receive_ack as "before(mh->seq, seq)" will stop to check for older sequence numbers that are ordered in the tail of "node->send_queue". The side effects of not having it correct ordered regarding "before(mh->seq, seq)" are refcounting issues and use-after free. I only was able to reproduce this issue in a experimental DLM branch and a user space DLM benchmark that uses io_uring. After changing this I don't experienced any refcounting with the sending buffer issues anymore.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.65%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

+0.21 pp

From 0.44% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.65%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-34.34
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1013.13
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.100-1 | < 7.1.5-1
Linux1 product
  • linux≥ 489d8e559c6596eb08e16447d9830bc39afbe54e, < ae9e534e502a0f48c12baf83608c5de0ff0eab11 | ≥ 489d8e559c6596eb08e16447d9830bc39afbe54e, < 6369619f1b665f12d8c99cc6ff733c64eb08b22e | ≥ 489d8e559c6596eb08e16447d9830bc39afbe54e, < 712714f818d83373847874ab0f8e426be79296cf | ≥ 489d8e559c6596eb08e16447d9830bc39afbe54e, < 4d45250b1d22960f86d83245be188b16e456218b | ≥ 489d8e559c6596eb08e16447d9830bc39afbe54e, < d2248cb70c070f8f04762872772e155b59016f17 | 5.14

3 vendors · 159 products

References

18 links
Show all 18 references