Vulnerability Details : CVE-2020-12826
A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.
Vulnerability category: Overflow
Exploit prediction scoring system (EPSS) score for CVE-2020-12826
Probability of exploitation activity in the next 30 days: 0.05%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 18 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2020-12826
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|
|
4.4
|
MEDIUM | AV:L/AC:M/Au:N/C:P/I:P/A:P |
3.4
|
6.4
|
[email protected] |
|
5.3
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
1.8
|
3.4
|
[email protected] |
CWE ids for CVE-2020-12826
-
The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.Assigned by: [email protected] (Primary)
References for CVE-2020-12826
- https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
-
https://bugzilla.redhat.com/show_bug.cgi?id=1822077
Issue Tracking;Patch;Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
-
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
Release Notes;Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200608-0001/
-
https://lists.openwall.net/linux-kernel/2020/03/24/1803
Exploit;Mailing List;Patch;Third Party Advisory
- https://usn.ubuntu.com/4391-1/
- https://usn.ubuntu.com/4369-1/
-
https://www.openwall.com/lists/kernel-hardening/2020/03/25/1
Exploit;Mailing List;Patch;Third Party Advisory
-
https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cef
Patch;Third Party Advisory
-
https://usn.ubuntu.com/4367-1/
Third Party Advisory
Products affected by CVE-2020-12826
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_mrg:2.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*