5.5

CVE-2026-64135: linux Uncontrolled Recursion

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-64135DEBIAN-CVE-2026-64135
Published 19-07-2026Last modified 19-07-2026
Open JSON

Vulnerability summary

CVE-2026-64135 is a medium (CVSS 5.5) Uncontrolled Recursion vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.8% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.12%
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.

Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX adm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and passes it to i2c_smbus_read_block_data() to retrieve the 4-byte BLACKBOX_INFO response. i2c_smbus_read_block_data() does not honour caller buffer sizes -- it memcpy()s data.block[0] bytes from the SMBus transaction (where data.block[0] is the length byte returned by the slave device, up to I2C_SMBUS_BLOCK_MAX = 32): memcpy(values, &data.block[1], data.block[0]); If the device returns any block length above 5, the call overflows the caller's 5-byte stack buffer before the post-call if (ret != 4) return -EIO; check has a chance to reject the response. Widen the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room for any well-formed SMBus block response, matching the convention used by the other i2c_smbus_read_block_data() callers in this driver.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.12% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.12%

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

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≥ 15609d1893020436e1e8ccfd9ded774a96dd17a2, < 33251abb9c9dd62943be76f0427c5527ee39188f | ≥ 15609d1893020436e1e8ccfd9ded774a96dd17a2, < ba09f4baa5bd96c5d26c942defa546a72dbbe5bf | ≥ 15609d1893020436e1e8ccfd9ded774a96dd17a2, < 6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e | ≥ 15609d1893020436e1e8ccfd9ded774a96dd17a2, < 0dbf64c502443c08c2e28a77ecbfcc5479d93228 | ≥ 15609d1893020436e1e8ccfd9ded774a96dd17a2, < 2b7a698d5093b548c464828d984f05ced5f3fd2a | ≥ 15609d1893020436e1e8ccfd9ded774a96dd17a2, < ca560f7566df7e2826c2999e959e6b94eb938f76 | ≥ 15609d1893020436e1e8ccfd9ded774a96dd17a2, < 7f705e581ef3e6bb308a121a89adf5237d968204 | ≥ 15609d1893020436e1e8ccfd9ded774a96dd17a2, < eee213daa1e1b402eb631bcd1b8c5aa340a6b081 | 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