UBUNTU-CVE-2020-10690
There is a use-after-free in kernel versions before 5.5 due to a race condition between the release of ptp_clock and cdev while resource deallocation. When a (high privileged) process allocates a ptp device file (like /dev/ptpX) and voluntarily goes to sleep. During this time if the underlying device is removed, it can cause an exploitable condition as the process wakes up to terminate and clean all attached files. The system crashes due to the cdev structure being invalid (as already freed) which is pointed to by the inode.
02 / AFFECTED SOFTWARE
Affected packages
80 explicit affected versions
33 explicit affected versions
6 explicit affected versions
13 explicit affected versions
6 explicit affected versions
191 explicit affected versions
38 explicit affected versions
19 explicit affected versions
1 explicit affected versions
44 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
7 explicit affected versions
1 explicit affected versions
48 explicit affected versions
11 explicit affected versions
10 explicit affected versions
19 explicit affected versions
47 explicit affected versions
18 explicit affected versions
3 explicit affected versions
1 explicit affected versions
36 explicit affected versions
1 explicit affected versions
15 explicit affected versions
23 explicit affected versions
11 explicit affected versions
82 explicit affected versions
2 explicit affected versions
39 explicit affected versions
43 explicit affected versions
111 explicit affected versions
51 explicit affected versions
52 explicit affected versions
1 explicit affected versions
1 explicit affected versions
69 explicit affected versions
21 explicit affected versions
44 explicit affected versions
5 explicit affected versions
26 explicit affected versions
1 explicit affected versions
38 explicit affected versions
89 explicit affected versions
65 explicit affected versions
24 explicit affected versions
29 explicit affected versions
22 explicit affected versions
12 explicit affected versions
4 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
There is a use-after-free in kernel versions before 5.5 due to a race condition between the release of ptp_clock and cdev while resource deallocation. When a (high privileged) process allocates a ptp device file (like /dev/ptpX) and voluntarily goes to sleep. During this time if the underlying device is removed, it can cause an exploitable condition as the process wakes up to terminate and clean all attached files. The system crashes due to the cdev structure being invalid (as already freed) which is pointed to by the inode.
05 / REFERENCES