A flaw was found in xorg-x11-server in versions before 1.20.11. An integer underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-3472
• https://bugzilla.redhat.com/show_bug.cgi?id=1944167
• https://gitlab.freedesktop.org/xorg/xserver/-/commit/7aaf54a1884f71dc363f0b884e57bcb67407a6cd
• https://lists.debian.org/debian-lts-announce/2021/04/msg00013.html
• https://lists.fedoraproject.org/archives/list/[email protected]/message/MDF7TAJE7NPZPNVOXSD5HBIFLNPUOD2V/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/MO6S5OPXUDYBSRSVWVLFLJ6AFERG4HNY/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/N63KL3T22HNFT4FJ7VMVF6U5Q4RFJIQF/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/PEXPCLMVU25AUZTUXC4MYBGPKOAIM5TW/
• https://lists.x.org/archives/xorg-announce/2021-April/003080.html
• https://seclists.org/oss-sec/2021/q2/20
• https://security.gentoo.org/glsa/202104-02
• https://www.debian.org/security/2021/dsa-4893
• https://www.tenable.com/plugins/nessus/148701
• https://www.zerodayinitiative.com/advisories/ZDI-21-463/
• http://www.openwall.com/lists/oss-security/2021/04/13/1