Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2019-15794

Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 64.9%
CVSS Severity
CVSS v3 Score 7.1
CVSS v2 Score 7.2
Products affected by CVE-2019-15794


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