UBUNTU-CVE-2020-27675
An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.
02 / AFFECTED SOFTWARE
Affected packages
87 explicit affected versions
50 explicit affected versions
6 explicit affected versions
6 explicit affected versions
57 explicit affected versions
191 explicit affected versions
54 explicit affected versions
18 explicit affected versions
35 explicit affected versions
8 explicit affected versions
63 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
12 explicit affected versions
1 explicit affected versions
7 explicit affected versions
11 explicit affected versions
1 explicit affected versions
19 explicit affected versions
25 explicit affected versions
55 explicit affected versions
18 explicit affected versions
11 explicit affected versions
10 explicit affected versions
34 explicit affected versions
5 explicit affected versions
54 explicit affected versions
33 explicit affected versions
1 explicit affected versions
1 explicit affected versions
23 explicit affected versions
13 explicit affected versions
50 explicit affected versions
1 explicit affected versions
21 explicit affected versions
30 explicit affected versions
10 explicit affected versions
11 explicit affected versions
89 explicit affected versions
19 explicit affected versions
2 explicit affected versions
53 explicit affected versions
13 explicit affected versions
58 explicit affected versions
1 explicit affected versions
119 explicit affected versions
11 explicit affected versions
66 explicit affected versions
1 explicit affected versions
13 explicit affected versions
9 explicit affected versions
1 explicit affected versions
9 explicit affected versions
1 explicit affected versions
11 explicit affected versions
3 explicit affected versions
76 explicit affected versions
9 explicit affected versions
35 explicit affected versions
44 explicit affected versions
16 explicit affected versions
5 explicit affected versions
38 explicit affected versions
9 explicit affected versions
97 explicit affected versions
9 explicit affected versions
81 explicit affected versions
32 explicit affected versions
43 explicit affected versions
4 explicit affected versions
8 explicit affected versions
43 explicit affected versions
1 explicit affected versions
12 explicit affected versions
13 explicit affected versions
4 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.
05 / REFERENCES
Further evidence
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=073d0552ead5bfc7a3a9c01de590e924f11b5dd2
- https://github.com/torvalds/linux/commit/073d0552ead5bfc7a3a9c01de590e924f11b5dd2
- https://ubuntu.com/security/CVE-2020-27675
- https://ubuntu.com/security/notices/USN-4679-1
- https://ubuntu.com/security/notices/USN-4680-1
- https://ubuntu.com/security/notices/USN-4681-1
- https://ubuntu.com/security/notices/USN-4751-1
- https://www.cve.org/CVERecord?id=CVE-2020-27675
- https://xenbits.xen.org/xsa/advisory-331.html