media: as102: fix to not free memory after the device is registered in as102_usb_probe()

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Summary

CVECVE-2026-31578
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:32 UTC
Updated2026-04-27 20:42:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: media: as102: fix to not free memory after the device is registered in as102_usb_probe() In as102_usb driver, the following race condition occurs: ``` CPU0 CPU1 as102_usb_probe() kzalloc(); // alloc as102_dev_t .... usb_register_dev(); fd = sys_open("/path/to/dev"); // open as102 fd .... usb_deregister_dev(); .... kfree(); // free as102_dev_t .... sys_close(fd); as102_release() // UAF!! as102_usb_release() kfree(); // DFB!! ``` When a USB character device registered with usb_register_dev() is later unregistered (via usb_deregister_dev() or disconnect), the device node is removed so new open() calls fail. However, file descriptors that are already open do not go away immediately: they remain valid until the last reference is dropped and the driver's .release() is invoked. In as102, as102_usb_probe() calls usb_register_dev() and then, on an error path, does usb_deregister_dev() and frees as102_dev_t right away. If userspace raced a successful open() before the deregistration, that open FD will later hit as102_release() --> as102_usb_release() and access or free as102_dev_t again, occur a race to use-after-free and double-free vuln. The fix is to never kfree(as102_dev_t) directly once usb_register_dev() has succeeded. After deregistration, defer freeing memory to .release(). In other words, let release() perform the last kfree when the final open FD is closed.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-416

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c cb8092038e95dc1113a68e63762de40fff61ba71 git Not specified
CNA Linux Linux affected cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c 582fbecb3756330006fe1950762412a68c2cacd2 git Not specified
CNA Linux Linux affected cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c 09e9206008b887aa553733bd915d73131071a086 git Not specified
CNA Linux Linux affected cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c 2eeae47a438694408189138048a786be99954032 git Not specified
CNA Linux Linux affected cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c 7e5aedf6059cba2a669d86caeaf5a51f33ec85a1 git Not specified
CNA Linux Linux affected cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c 8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c git Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/582fbecb3756330006fe1950762412a68c2cacd2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2eeae47a438694408189138048a786be99954032 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7e5aedf6059cba2a669d86caeaf5a51f33ec85a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/09e9206008b887aa553733bd915d73131071a086 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cb8092038e95dc1113a68e63762de40fff61ba71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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