USB: chaoskey: Fix slab-use-after-free in chaoskey_release()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64455
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:30 UTC
Updated2026-07-25 10:17:30 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: USB: chaoskey: Fix slab-use-after-free in chaoskey_release() The chaoskey driver has a use-after-free bug in its release routine. If the user closes the device file after the USB device has been unplugged, a debugging log statement will try to access the usb_interface structure after it has been deallocated: BUG: KASAN: slab-use-after-free in dev_driver_string (drivers/base/core.c:2406) Read of size 8 at addr ffff888168e8a0b8 by task chaoskey_raw_re/10106 Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:595) dev_driver_string (drivers/base/core.c:2406) __dynamic_dev_dbg (lib/dynamic_debug.c:906) chaoskey_release (drivers/usb/misc/chaoskey.c:323) __fput (fs/file_table.c:510) fput_close_sync (fs/file_table.c:615) __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) The driver's last reference to the interface structure is dropped in the chaoskey_free() routine, so the code must not use the interface -- even in a debugging statement -- after that routine returns. (Exception: If we know that another reference is held by someone else, such as the device core while the disconnect routine runs, there's no problem. Thanks to Johan Hovold for pointing this out.) Since the bad access is part of an unimportant debugging statement, we can fix the problem simply by removing the whole statement.

Risk And Classification

EPSS: 0.002200000 probability, percentile 0.125900000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 66e3e591891da9899a8990792da080432531ffd4 fe7a0f4be283b40dd592540027279735120d0d6f git Not specified
CNA Linux Linux affected 66e3e591891da9899a8990792da080432531ffd4 5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023 git Not specified
CNA Linux Linux affected 66e3e591891da9899a8990792da080432531ffd4 f3e409476ad0703c54c14f245e4e143c8124e1bd git Not specified
CNA Linux Linux affected 66e3e591891da9899a8990792da080432531ffd4 6c82f88bc7a8458d5c60f9b354c4d32d233f0cac git Not specified
CNA Linux Linux affected 66e3e591891da9899a8990792da080432531ffd4 3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89 git Not specified
CNA Linux Linux affected 66e3e591891da9899a8990792da080432531ffd4 2a52d55c86a429dac47886b8424e67f90b001e67 git Not specified
CNA Linux Linux affected 66e3e591891da9899a8990792da080432531ffd4 8f50613bff228272577893aa10a346a2f3063e49 git Not specified
CNA Linux Linux affected 66e3e591891da9899a8990792da080432531ffd4 abf76d3239dee97b66e7241ad04811f1ce562e28 git Not specified
CNA Linux Linux affected 4.1 Not specified
CNA Linux Linux unaffected 4.1 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8f50613bff228272577893aa10a346a2f3063e49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe7a0f4be283b40dd592540027279735120d0d6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/abf76d3239dee97b66e7241ad04811f1ce562e28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f3e409476ad0703c54c14f245e4e143c8124e1bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6c82f88bc7a8458d5c60f9b354c4d32d233f0cac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2a52d55c86a429dac47886b8424e67f90b001e67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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