9.1

CVE-2026-43406: linux Out-of-bounds Read

CVSS: 9.1v3.1CriticalModified
AliasesUBUNTU-CVE-2026-43406DEBIAN-CVE-2026-43406
Published 08-05-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-43406 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.72%
0%100%
Low · +0.22 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 27 · Related 37
LSN-0121-1OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22108-1SUSE-SU-2026:22137-1SUSE-SU-2026:22433-1SUSE-SU-2026:22458-1

Timeline

  1. 08-05-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: prevent potential out-of-bounds reads in process_message_header() If the message frame is (maliciously) corrupted in a way that the length of the control segment ends up being less than the size of the message header or a different frame is made to look like a message frame, out-of-bounds reads may ensue in process_message_header(). Perform an explicit bounds check before decoding the message header.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.72%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

+0.22 pp

From 0.50% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.72%

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

Affected systems

Ubuntu145 products
  • linux< 5.15.0-185.195 | < 6.8.0-134.134 | < 6.17.0-40.40
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1111.118 | < 6.8.0-1060.63 | < 6.17.0-1019.19
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 76ccf21a12c5f6d6790bc32c7da82446d877b2f4 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 75582aaa580c11aed4c7731cad6b068b700e7efb | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 50156622eb0888e62541d715a98584480a1bc7cb | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < dbd857a9e1e33ea71eaf3e211877027e533770d1 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 69fe5af33fa3806f398d21c081d73c66e5523bc2 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 035867ae6f18df0aeedb2a57a5b74091bd4e3fe8 | ≥ cd1a677cad994021b19665ed476aea63f5d54f31, < 69fb5d91bba44ecf7eb80530b85fa4fb028921d5 | 5.11
  • linux_kernel≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.167 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.78 | ≥ 6.13, < 6.18.19 | ≥ 6.19, < 6.19.9 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.10-1

3 vendors · 148 products

References

37 links
Show all 37 references