CVE-2025-21810: In the Linux kernel, the following vulnerability has been resolved: driver core: class: Fix wild pointer dereferences in API class_dev_iter_next() There are a…

PriorityP419medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.20%

9.8th percentile

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

driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()

There are a potential wild pointer dereferences issue regarding APIs
class_dev_iter_(init|next|exit)(), as explained by below typical usage:

// All members of @iter are wild pointers.
struct class_dev_iter iter;

// class_dev_iter_init(@iter, @class, ...) checks parameter @class for
// potential class_to_subsys() error, and it returns void type and does
// not initialize its output parameter @iter, so caller can not detect
// the error and continues to invoke class_dev_iter_next(@iter) even if
// @iter still contains wild pointers.
class_dev_iter_init(&iter, ...);

// Dereference these wild pointers in @iter here once suffer the error.
while (dev = class_dev_iter_next(&iter)) { ... };

// Also dereference these wild pointers here.
class_dev_iter_exit(&iter);

Actually, all callers of these APIs have such usage pattern in kernel tree.
Fix by:
- Initialize output parameter @iter by memset() in class_dev_iter_init()
and give callers prompt by pr_crit() for the error.
- Check if @iter is valid in class_dev_iter_next().

Affected

12 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.12.13-1 (forky)	linux 6.12.13-1 (forky)
linux	linux	—	—
linux	linux	>= 7b884b7f24b42fa25e92ed724ad82f137610afaf < f4b9bc823b0cfdebfed479c0e87d6939c7562e87	f4b9bc823b0cfdebfed479c0e87d6939c7562e87
linux	linux	>= 7b884b7f24b42fa25e92ed724ad82f137610afaf < 1614e75d1a1b63db6421c7a4bf37004720c7376c	1614e75d1a1b63db6421c7a4bf37004720c7376c
linux	linux	>= 7b884b7f24b42fa25e92ed724ad82f137610afaf < 5c504e9767b947cf7d4e29b811c0c8b3c53242b7	5c504e9767b947cf7d4e29b811c0c8b3c53242b7
linux	linux	>= 7b884b7f24b42fa25e92ed724ad82f137610afaf < e128f82f7006991c99a58114f70ef61e937b1ac1	e128f82f7006991c99a58114f70ef61e937b1ac1
linux	linux_kernel	>= 0 < 6.12.13-1	6.12.13-1
linux	linux_kernel	>= 0 < 6.12.13-1	6.12.13-1
linux	linux_kernel	>= 0 < 6.8.0-64.67	6.8.0-64.67
linux	linux_kernel	>= 6.13 < 6.13.2	6.13.2
linux	linux_kernel	>= 6.4 < 6.6.76	6.6.76
linux	linux_kernel	>= 6.7 < 6.12.13	6.12.13

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv7.8HIGH

vendor_ubuntu7.8HIGH

vendor_debian5.5LOW

vendor_redhat5.5MEDIUM

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