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A use-after-free vulnerability in the Linux kernel's DAMON sysfs interface was resolved by adding proper locking to protect the path buffer during user reads and writes. The flaw allowed users to read a freed buffer, potentially leading to memory corruption. This issue affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. The vulnerability has a CVSS score of 7.8, indicating a high impact on confidentiality, integrity, and availability. A patch is available and should be applied to affected systems.

The Linux kernel contained a vulnerability in the mm/damon/sysfs-schemes component where the path pointer (damon_sysfs_quot_goal->path) could be read and written by users via the DAMON sysfs 'path' file without proper locking. While parameter commits were protected by damon_sysfs_lock, direct user reads and writes were not, leading to a use-after-free condition when the write operation deallocated the path buffer. This could allow readers to access freed memory if they use separate open files, causing potential memory corruption. The issue was fixed by protecting both user reads and writes with damon_sysfs_lock. The vulnerability affects Linux kernel versions prior to 7.0.0-28.28 and related variants.

Detailed information about UBUNTU-CVE-2026-46183 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-46183 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock… (CVE-2026-46183)

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