Linux Kernel up to 6.18.35/7.0.12 RDMA ib_get_ucaps privilege escalation

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.18.35/7.0.12. Impacted is the function ib_get_ucaps of the component RDMA. The manipulation results in an unknown weakness. This vulnerability is reported as CVE-2026-53188. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18.35/7.0.12. Affected is the function ib_get_ucaps of the component RDMA. The impact remains unknown. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-53188 since 06/09/2026. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/25/2026).

Upgrading to version 6.18.36 or 7.0.13 eliminates this vulnerability. Applying the patch 96b6e98ff12d50ed5817230c6f1188e1150d225d/aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b/4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 6.18.30
• 6.18.31
• 6.18.32
• 6.18.33
• 6.18.34
• 6.18.35
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 7.0.11
• 7.0.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

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