Medium severity5.3NVD Advisory· Published May 12, 2020· Updated Jun 17, 2026
CVE-2020-12826
CVE-2020-12826
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.
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Affected products
10- Linux/Linux kerneldescription
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
- 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:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_mrg:2.0:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
11- bugzilla.redhat.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
- github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cefnvdPatchThird Party Advisory
- lists.openwall.net/linux-kernel/2020/03/24/1803nvdExploitMailing ListPatchThird Party Advisory
- www.openwall.com/lists/kernel-hardening/2020/03/25/1nvdExploitMailing ListPatchThird Party Advisory
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5nvdRelease NotesThird Party Advisory
- usn.ubuntu.com/4367-1/nvdThird Party Advisory
- lists.debian.org/debian-lts-announce/2020/06/msg00011.htmlnvd
- lists.debian.org/debian-lts-announce/2020/06/msg00013.htmlnvd
- security.netapp.com/advisory/ntap-20200608-0001/nvd
- usn.ubuntu.com/4369-1/nvd
- usn.ubuntu.com/4391-1/nvd
News mentions
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