CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.
Описание
Оригинално описание
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.
Засегнати продукти
- Ubuntu Linux kernel: 5.3 kernel преди 5.3.0-24.26; 5.0 kernel преди 5.0.0-37.40
Вид слабост
История
- 23 април 2020 Публикувано
Други уязвимости в Ubuntu Linux kernel
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2019-15794
- https://nvd.nist.gov/vuln/detail/CVE-2019-15794
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=270d16ae48a4dbf1c7e25e94cc3e38b4bea37635
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=ef81780548d20a786cc77ed4203fca146fd81ce3
- https://usn.ubuntu.com/usn/usn-4208-1
- https://usn.ubuntu.com/usn/usn-4209-1