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.

🗓️ 23 Feb 2022 08:00:00Reported by MicrosoftType

mscve

mscve🔗 msrc.microsoft.com👁 7 Views

Heap overflow in legacy_parse_param of Linux Filesystem Context API enables privilege escalation.

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Vulners

Node

OR

microsoft cbl2_kernel_5.15.26.1-1Range<5.15.26.1-1

microsoft cm1_kernel_5.10.93.1-4Range<-

23 Feb 2022 08:00Current

7.7High risk

Vulners AI Score7.7

CVSS 27.2

CVSS 3.18.4

EPSS0.25151

SSVC

heap overflow legacy parse param linux kernel filesystem context api privilege escalation unprivileged user