CVE-2024-50284

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: Fix the missing xa_store error check

xa_store() can fail, it return xa_err(-EINVAL) if the entry cannot be stored in an XArray, or xa_err(-ENOMEM) if memory allocation failed, so check error for xa_store() to fix it.

A flaw was found in the Linux kernel ksmbd SMB server where the return value of xa_store() in the session management code (fs/smb/server/mgmt/user_session.c) was not checked. If xa_store() fails, either because the entry cannot be stored in the XArray (xa_err(-EINVAL)) or because memory allocation failed (xa_err(-ENOMEM)), the code continues as though the entry had been stored successfully, leaving session management structures in an inconsistent state. The impact on Red Hat products is Low, with a Red Hat CVSS score of 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), reflecting a local attack vector that requires privileges and affects availability only; this is lower than the CVE.org record, which assigns a score of 7.5 with a network attack vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Within the Red Hat product portfolio, only the Fedora kernel is affected, and a fix is being pursued through the Fedora community kernel maintainers. Red Hat Enterprise Linux 6, 7, 8, and 9 kernels (both kernel and kernel-rt) are marked not affected by this flaw.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.