CVE-2026-43178

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the procfs component within the do procmap query() function. When a user provides an incorrectly sized buffer for the build ID during a PROCMAP QUERY, the system returns an -ENAMETOOLONG error. Due to recent changes, this error can occur after the mmap lock or per-VMA lock has been unlocked and mmput() has been executed. Consequently, the original error handling path triggers a second mmput() on the mm struct, leading to a double-mmput condition.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.