5.5

CVE-2026-45865: mctp i2c: initialise event handler read bytes

Analyzed
AliasesUBUNTU-CVE-2026-45865DEBIAN-CVE-2026-45865
Published 27-05-2026Last modified 27-05-2026

Vulnerability summary

CVE-2026-45865 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.2% 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
0.16%
0%100%
Low · 0.00 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 22 · Related 22
OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23221-1SUSE-SU-2026:23231-1SUSE-SU-2026:23237-1

Timeline

  1. 27-05-2026
    PublishedVulnerability first disclosed.

Description

In the Linux kernel, the following vulnerability has been resolved: mctp i2c: initialise event handler read bytes Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads will return "val" from the i2c bus driver. For i2c-aspeed and i2c-npcm7xx that is a stack uninitialised u8. Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c instance, now it returns all 0xff.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

No change 0.00 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.

Ubuntu130 products
  • linux< 6.8.0-134.134 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1060.63 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f5b8abf9fc3dacd7529d363e26fe8230935d65f8, < 93e01e837e105299f1c259ef71f6e1ec4fe806e3 | ≥ f5b8abf9fc3dacd7529d363e26fe8230935d65f8, < 11f83253244060b5de5eac787f61ae3f3e559d01 | ≥ f5b8abf9fc3dacd7529d363e26fe8230935d65f8, < fa9861e5c8af7651dddfa8d490aaada17ae33b6c | ≥ f5b8abf9fc3dacd7529d363e26fe8230935d65f8, < 6ff2ebfef75fbc57d937d8fbe738b967edf2d331 | ≥ f5b8abf9fc3dacd7529d363e26fe8230935d65f8, < 1eeedb310229bfee9dd4d992e5bba33fe1378a8f | ≥ f5b8abf9fc3dacd7529d363e26fe8230935d65f8, < 2a14e91b6d76639dac70ea170f4384c1ee3cb48d | 5.18
  • linux_kernel≥ 5.18, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.14 | ≥ 6.19, < 6.19.4
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.18.14-1

3 vendors · 133 products

References

22 links
Show all 22 references