7.8

CVE-2026-64086: linux

CVSS: 7.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-64086DEBIAN-CVE-2026-64086
Published 19-07-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-64086 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.9% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 43 · Related 43
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1SUSE-SU-2026:23528-1SUSE-SU-2026:23529-1SUSE-SU-2026:23881-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer adm1266_pmbus_block_xfer() sets up the read transaction with .buf = data->read_buf, .len = ADM1266_PMBUS_BLOCK_MAX + 2, but read_buf in struct adm1266_data is declared as u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1]; For a max-length block response (length byte = 255 + up to 1 PEC byte), the i2c controller is told to write 257 bytes into a 256-byte buffer, putting one byte past the end of read_buf. The same response also makes the subsequent PEC compare if (crc != msgs[1].buf[msgs[1].buf[0] + 1]) read a byte beyond the array. Bump the read_buf declaration to ADM1266_PMBUS_BLOCK_MAX + 2 so the buffer can hold the length byte, up to 255 payload bytes, and the PEC byte the i2c_msg length already accounts for.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

0.00 pp

From 0.14% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.14%

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

Ubuntu155 products
  • linux< 5.15.0-186.196 | < 6.8.0-139.139 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1112.119 | < 6.8.0-1064.67 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 407dc802a9c0809ca6a48de4b4c63305eb84ef56, < 397d3f523bfff2f4e3dacf9b1339bd76dc207f78 | ≥ 407dc802a9c0809ca6a48de4b4c63305eb84ef56, < 472744f69d25a2d5111ad62f1d62579dce2c13c8 | ≥ 407dc802a9c0809ca6a48de4b4c63305eb84ef56, < 528a9f88e88502d0c2f2052a279415074cd83715 | ≥ 407dc802a9c0809ca6a48de4b4c63305eb84ef56, < d94ceb16e55b6d8019ab069e357c76ac42f0ffbc | ≥ 407dc802a9c0809ca6a48de4b4c63305eb84ef56, < bd5be3fa5de6dbf61f1b3cec6b79c2c2f8065694 | ≥ 407dc802a9c0809ca6a48de4b4c63305eb84ef56, < 2279c342d94eca225bf9f301c8806a05a1c81619 | ≥ 407dc802a9c0809ca6a48de4b4c63305eb84ef56, < a6c802145a8de0830bca803c6d415f7e9e683624 | ≥ 407dc802a9c0809ca6a48de4b4c63305eb84ef56, < 487566cb1ccdf3756fdd7bf8d875e612ff3169bb | 5.10
  • linux_kernel≥ 5.10, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.142 | ≥ 6.7, < 6.12.92 | ≥ 6.13, < 6.18.34 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1

3 vendors · 158 products

References

44 links
Show all 44 references