Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.6.5 |
| Canonical | Ubuntu Linux | 20.04 |
| Redhat | Enterprise Linux | 5.0 |
| Redhat | Enterprise Mrg | 2.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1822077Issue TrackingPatchThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5Release NotesThird Party Advisory
- https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cePatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
- https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
- https://lists.openwall.net/linux-kernel/2020/03/24/1803ExploitMailing ListPatch
- https://security.netapp.com/advisory/ntap-20200608-0001/
- https://usn.ubuntu.com/4367-1/Third Party Advisory
- https://usn.ubuntu.com/4369-1/
- https://usn.ubuntu.com/4391-1/
- https://www.openwall.com/lists/kernel-hardening/2020/03/25/1ExploitMailing ListPatch
- https://bugzilla.redhat.com/show_bug.cgi?id=1822077Issue TrackingPatchThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5Release NotesThird Party Advisory
- https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cePatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
FAQ
What is CVE-2020-12826?
CVE-2020-12826 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 ...
How severe is CVE-2020-12826?
CVE-2020-12826 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-12826?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Canonical Ubuntu Linux, Redhat Enterprise Linux, Redhat Enterprise Mrg.