CVE-2020-10711

NameCVE-2020-10711
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1fixed
jessie (security)3.16.81-1fixed
stretch4.9.210-1vulnerable
stretch (security)4.9.189-3+deb9u2vulnerable
buster4.19.118-2vulnerable
buster (security)4.19.98-1+deb10u1vulnerable
bullseye, sid5.6.14-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)5.6.14-1
linuxsourcejessie(not affected)

Notes

[jessie] - linux <not-affected> (Vulnerability introduced later)
https://www.openwall.com/lists/oss-security/2020/05/12/2

Search for package or bug name: Reporting problems