usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop

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Summary

CVECVE-2026-31728
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:35 UTC
Updated2026-05-07 16:16:19 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop A race condition between gether_disconnect() and eth_stop() leads to a NULL pointer dereference. Specifically, if eth_stop() is triggered concurrently while gether_disconnect() is tearing down the endpoints, eth_stop() attempts to access the cleared endpoint descriptor, causing the following NPE: Unable to handle kernel NULL pointer dereference Call trace: __dwc3_gadget_ep_enable+0x60/0x788 dwc3_gadget_ep_enable+0x70/0xe4 usb_ep_enable+0x60/0x15c eth_stop+0xb8/0x108 Because eth_stop() crashes while holding the dev->lock, the thread running gether_disconnect() fails to acquire the same lock and spins forever, resulting in a hardlockup: Core - Debugging Information for Hardlockup core(7) Call trace: queued_spin_lock_slowpath+0x94/0x488 _raw_spin_lock+0x64/0x6c gether_disconnect+0x19c/0x1e8 ncm_set_alt+0x68/0x1a0 composite_setup+0x6a0/0xc50 The root cause is that the clearing of dev->port_usb in gether_disconnect() is delayed until the end of the function. Move the clearing of dev->port_usb to the very beginning of gether_disconnect() while holding dev->lock. This cuts off the link immediately, ensuring eth_stop() will see dev->port_usb as NULL and safely bail out.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-362

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2b3d942c4878084a37991a65e66512c02b8fa2ad f02980594deef751e42133714aee25228f1494c6 git Not specified
CNA Linux Linux affected 2b3d942c4878084a37991a65e66512c02b8fa2ad e1e7a66584bf0aff3becb73c19fa31527889fc9e git Not specified
CNA Linux Linux affected 2b3d942c4878084a37991a65e66512c02b8fa2ad a259ba0bce3b192c04334499690372a250f7d0b1 git Not specified
CNA Linux Linux affected 2b3d942c4878084a37991a65e66512c02b8fa2ad f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca git Not specified
CNA Linux Linux affected 2b3d942c4878084a37991a65e66512c02b8fa2ad bbb09bb89ffa571475f66daca9482b974cd29d6a git Not specified
CNA Linux Linux affected 2b3d942c4878084a37991a65e66512c02b8fa2ad 6ad77458637b78ec655e3da5f112c862e6690a9d git Not specified
CNA Linux Linux affected 2b3d942c4878084a37991a65e66512c02b8fa2ad 8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8 git Not specified
CNA Linux Linux affected 2b3d942c4878084a37991a65e66512c02b8fa2ad e1eabb072c75681f78312c484ccfffb7430f206e git Not specified
CNA Linux Linux affected 2.6.27 Not specified
CNA Linux Linux unaffected 2.6.27 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bbb09bb89ffa571475f66daca9482b974cd29d6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6ad77458637b78ec655e3da5f112c862e6690a9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a259ba0bce3b192c04334499690372a250f7d0b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f02980594deef751e42133714aee25228f1494c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e1eabb072c75681f78312c484ccfffb7430f206e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e1e7a66584bf0aff3becb73c19fa31527889fc9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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