CVE-2020-12826
Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism.
Does this matter?
Lower severity and a low EPSS score (0.71%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.3 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- EPSS
- 0.71% probability · 51th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- linux/linux kernel · canonical/ubuntu linux · redhat/enterprise linux · redhat/enterprise mrg
- Source
- cve@mitre.org
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1822077Issue Tracking, Patch, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5Release Notes, Third Party Advisory
- https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cefPatch, Third 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/2020/03/24/1803Exploit, Mailing List, Patch, Third Party Advisory
- 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/2020/03/25/1Exploit, Mailing List, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1822077Issue Tracking, Patch, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5Release Notes, Third Party Advisory
- https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cefPatch, Third 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/2020/03/24/1803Exploit, Mailing List, Patch, Third Party Advisory
- 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/2020/03/25/1Exploit, Mailing List, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.