PT-2019-4753 · Linux+1 · Linux Kernel+1
Jann Horn
·
Publicado
2019-11-01
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Atualizado
2020-05-01
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CVE-2019-15791
CVSS v3.1
7.8
Alta
| Vetor | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions 5.0 and 5.3
Description
The issue is related to an uncontrolled resource consumption in the shiftfs component of the Linux kernel. Exploitation of this issue may allow an attacker to cause a denial of service. The problem arises from the
shiftfs btrfs ioctl fd replace() function, which installs an fd referencing a file from the lower filesystem without taking an additional reference to that file, leading to a refcount underflow after the btrfs ioctl completes and the fd is closed.Recommendations
For Linux kernel versions 5.0 and 5.3, consider disabling the
shiftfs btrfs ioctl fd replace() function as a temporary workaround until a patch is available. Restrict access to the shiftfs component to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.Exploit
Resource Exhaustion
Integer Underflow
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Identificadores relacionados
Produtos afetados
Linux Kernel
Ubuntu