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A heap-based buffer overflow flaw was found in the way the legacy_parse_param function in the Filesystem Context functionality of the Linux kernel verified the supplied parameters length. An unprivileged (in case of unprivileged user namespaces enabled, otherwise needs namespaced CAP_SYS_ADMIN privilege) local user able to open a filesystem that does not support the Filesystem Context API (and thus fallbacks to legacy handling) could use this flaw to escalate their privileges on the system.

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=722d94847de2 x_refsource_MISC
• https://github.com/Crusaders-of-Rust/CVE-2022-0185 x_refsource_MISC
• https://www.openwall.com/lists/oss-security/2022/01/18/7 x_refsource_MISC
• https://www.willsroot.io/2022/01/cve-2022-0185.html x_refsource_MISC
• https://security.netapp.com/advisory/ntap-20220225-0003/ x_refsource_CONFIRM
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-0185 government-resource