CVE-2020-10711

Name	CVE-2020-10711
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2242-1, DSA-4698-1, DSA-4699-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	jessie, jessie (lts)	3.16.84-1	fixed
	stretch (security)	4.9.320-2	fixed
	stretch (lts), stretch	4.9.320-3	fixed
	buster	4.19.249-2	fixed
	buster (security)	4.19.304-1	fixed
	bullseye	5.10.209-2	fixed
	bullseye (security)	5.10.205-2	fixed
	bookworm	6.1.76-1	fixed
	bookworm (security)	6.1.85-1	fixed
	trixie	6.6.15-2	fixed
	sid	6.7.9-2	fixed
linux-4.9 (PTS)	jessie, jessie (lts)	4.9.303-1~deb8u3	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
linux	source	wheezy	(unfixed)	end-of-life
linux	source	jessie	(not affected)
linux	source	stretch	4.9.210-1+deb9u1		DSA-4698-1
linux	source	buster	4.19.118-2+deb10u1		DSA-4699-1
linux	source	(unstable)	5.6.14-1
linux-4.9	source	jessie	4.9.210-1+deb9u1~deb8u1		DLA-2242-1

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