Integer overflow in Linux Kernel
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 class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.007 (51.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 20.04
- Red Hat Enterprise Linux — versions 5.0, 6.0, 7.0
- Red Hat Enterprise Mrg — versions 2.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5 (Third Party Advisory, Release Notes)
- www.openwall.com/lists/kernel-hardening/2020/03/25/1 (Exploit, Patch, Mailing List, Third Party Advisory)
- lists.openwall.net/linux-kernel/2020/03/24/1803 (Exploit, Patch, Mailing List, Third Party Advisory)
- github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cef (Patch, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- usn.ubuntu.com/4367-1/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4369-1/ (vendor-advisory)
- security.netapp.com/advisory/ntap-20200608-0001/
- lists.debian.org/debian-lts-announce/2020/06/msg00011.html (mailing-list)
- lists.debian.org/debian-lts-announce/2020/06/msg00013.html (mailing-list)
Frequently asked questions
- What is CVE-2020-12826?
- CVE-2020-12826 is a medium-severity vulnerability in Linux Kernel, classified under Integer Overflow or Wraparound. CVSS score: 5.3/10. Published 2020-05-12.
- How severe is CVE-2020-12826?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2020-12826 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.