CVE-2019-157947.1HighCWE-672

CVE-2019-15794: Reference counting error in overlayfs/shiftfs error path when used in conjuction with aufs

Ubuntu · Linux kernel

Vendor fix available · Affected: Ubuntu Linux kernel · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.2%probability of exploitation in the next 30 days

67th percentile

050100

Higher than 67% of scored CVEs

7.1HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Ubuntu · Linux kernelfrom 5.3 kernel before 5.3.0-24.26; from 5.0 kernel before 5.0.0-37.40

On the Atlas

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Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Operation on a Resource after Expiration or Release · Other weaknesses
Vendor: Ubuntu
Published: April 2020
Band: Possible (1 to 10%), April 2020

CoverageNo articles yet

No CyberSIXT article names CVE-2019-15794 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.