NULL pointer dereference in Linux Kernel
CVE-2020-10711
A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.031 (87.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- Debian Linux — versions 8.0, 9.0, 10.0
- openSUSE Leap — versions 15.1, 15.2
- Red Hat Kernel — versions all kernel versions before 5.7
- Red Hat 3scale — versions 2.0
- Red Hat Enterprise Linux — versions 6.0, 7.0, 8.0
- Red Hat Enterprise Linux Aus — versions 7.4
- Red Hat Enterprise Linux Server Tus — versions 7.4
- Red Hat Messaging Realtime Grid — versions 2.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- www.openwall.com/lists/oss-security/2020/05/12/2 (Patch, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20200608-0001/ (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/06/msg00012.html (mailing-list, Third Party Advisory)
- www.debian.org/security/2020/dsa-4698 (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2020/dsa-4699 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html (vendor-advisory, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4413-1/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4411-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-10711?
- CVE-2020-10711 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.9/10. Published 2020-05-22.
- How severe is CVE-2020-10711?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2020-10711 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.