Not yet scoredPublished Jul 25, 2026

CVE-2026-64455USB: chaoskey: Fix slab-use-after-free in chaoskey_release()

Updated under an hour ago (Oct 26, 2026, 10:30 PM ET)

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In 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.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 66e3e591891da9899a8990792da080432531ffd4 before fe7a0f4be283b40dd592540027279735120d0d6f; 66e3e591891da9899a8990792da080432531ffd4 builds before 5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023; from 66e3e591891da9899a8990792da080432531ffd4 before f3e409476ad0703c54c14f245e4e143c8124e1bd; 66e3e591891da9899a8990792da080432531ffd4 builds before 6c82f88bc7a8458d5c60f9b354c4d32d233f0cac; 66e3e591891da9899a8990792da080432531ffd4 builds before 3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89; 66e3e591891da9899a8990792da080432531ffd4 builds before 2a52d55c86a429dac47886b8424e67f90b001e67; 66e3e591891da9899a8990792da080432531ffd4 builds before 8f50613bff228272577893aa10a346a2f3063e49; from 66e3e591891da9899a8990792da080432531ffd4 before abf76d3239dee97b66e7241ad04811f1ce562e28	CNA record

References

References

https://git.kernel.org/stable/c/fe7a0f4be283b40dd592540027279735120d0d6f
https://git.kernel.org/stable/c/5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023
https://git.kernel.org/stable/c/f3e409476ad0703c54c14f245e4e143c8124e1bd
https://git.kernel.org/stable/c/6c82f88bc7a8458d5c60f9b354c4d32d233f0cac
https://git.kernel.org/stable/c/3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89
https://git.kernel.org/stable/c/2a52d55c86a429dac47886b8424e67f90b001e67
https://git.kernel.org/stable/c/8f50613bff228272577893aa10a346a2f3063e49
https://git.kernel.org/stable/c/abf76d3239dee97b66e7241ad04811f1ce562e28

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.