Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-25T00:00:00 kernel: RDMA/core: Validate the passed in fops for ib_get_ucaps() 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-351

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Validate the passed in fops for ib_get_ucaps() Sashiko pointed out it is not safe to rely only on the devt because char/block alias so if the user finds a block device with the same dev_t it can masquerade as a ucap cdev fd. Test the f_ops to only accept authentic cdevs.

A flaw was found in the Linux kernel's RDMA/core component. This vulnerability arises from insufficient validation of file operations (fops) passed to the ib_get_ucaps() function. A local attacker could exploit this by creating a block device with a device number (dev_t) that aliases a character device (char/block alias), allowing them to masquerade as a legitimate user capabilities (ucap) character device file descriptor. This impersonation could lead to a security bypass, potentially granting unauthorized access to RDMA capabilities.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53188 https://nvd.nist.gov/vuln/detail/CVE-2026-53188 https://lore.kernel.org/linux-cve-announce/2026062557-CVE-2026-53188-8d3d@gregkh/T