Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-64458
Published: July 27, 2026
Vulnerability identifier: #VU139489
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64458
CWE-ID: CWE-754
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service or perform an out-of-bounds read.
The vulnerability exists due to improper handling of exceptional conditions in damon_hot_score() and damon_max_nr_accesses() when processing user-controlled DAMON monitoring intervals via sysfs. A local user can write zero or excessively large interval values to sysfs settings to cause a denial of service or perform an out-of-bounds read.
Exploitation requires sysfs write permission.
Affected software
Linux kernel
How to mitigate CVE-2026-64458
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/35d4a3cf70a855b50e53189ac2f8463e20a02046
- https://git.kernel.org/stable/c/58321b4e6e4f0f412069ab27ccdd56292757343a
- https://git.kernel.org/stable/c/74fef68d521150281e36cdaa20e9e1ee3e3aa146
- https://git.kernel.org/stable/c/76e415ea88d20f022ed5cfcf78c50e156a267e91
- https://git.kernel.org/stable/c/9c8f31eaae6140ecadec0c07320498a944556de2
- https://git.kernel.org/stable/c/ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a