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Vulnerability · Published May 22, 2020 · Assigned by redhat

CVE-2020-10711

Medium 5.9

In plain English

A medium-severity null pointer dereference in Kernel from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.1% (higher than 88% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)3.1%top 12.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.6.14-1DEBIAN-CVE-2020-10711
Debian:13linux5.6.14-1DEBIAN-CVE-2020-10711
Debian:14linux5.6.14-1DEBIAN-CVE-2020-10711
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2020-10711
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2020-10711
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2020-10711
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2020-10711

Affected products (as reported)

VendorProductVersions
Red Hat Kernel all kernel versions before 5.7

Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References