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CVE-2026-53188

RDMA/core: Validate the passed in fops for ib_get_ucaps()

HIGH
8.8
CVSS Score
Published: June 25, 2026 at 08:39 AM UTC
Updated: October 19, 2026 at 08:19 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
6.15 ≤ v < 6.18.366.19 ≤ v < 7.0.1361e51682816d395307f78ae06d640089054c28ab7.17.1 rc17.1 rc27.1 rc37.1 rc47.1 rc57.1 rc67.1 rc7
Vendor states this is fixed in 4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee (fixed)
Vendor states this is fixed in 96b6e98ff12d50ed5817230c6f1188e1150d225d (fixed)
Vendor states this is fixed in aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b (fixed)
Vendor states this is fixed in 6.15 (unaffected)
Vendor states this is fixed in 6.18.36 (unaffected)
Vendor states this is fixed in 7.0.13 (unaffected)
Vendor states this is fixed in 7.1 (unaffected)

References (3)

Patch
Source: cverecord
https://git.kernel.org/stable/c/96b6e98ff12d50ed5817230c6f1188e1150d225d
Patch
Source: cverecord
https://git.kernel.org/stable/c/aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b
Patch
Source: cverecord
https://git.kernel.org/stable/c/4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfoCWE-285

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