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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 2a52d55c86a429dac47886b8424e67f90b001e67, 3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89, 5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023.

Low priority for now. Upgrade to Linux Linux 2a52d55c86a429dac47886b8424e67f90b001e67, 3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89, 5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Jul 25, 2026
Updated
Nov 3, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.1affected
    • 66e3e591891da9899a8990792da080432531ffd4 and later · before fe7a0f4be283b40dd592540027279735120d0d6faffected · git
    • 66e3e591891da9899a8990792da080432531ffd4 and later · before 5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023affected · git
    • 66e3e591891da9899a8990792da080432531ffd4 and later · before f3e409476ad0703c54c14f245e4e143c8124e1bdaffected · git
    • 66e3e591891da9899a8990792da080432531ffd4 and later · before 6c82f88bc7a8458d5c60f9b354c4d32d233f0cacaffected · git
    • 66e3e591891da9899a8990792da080432531ffd4 and later · before 3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89affected · git
    • 66e3e591891da9899a8990792da080432531ffd4 and later · before 2a52d55c86a429dac47886b8424e67f90b001e67affected · git
    • 66e3e591891da9899a8990792da080432531ffd4 and later · before 8f50613bff228272577893aa10a346a2f3063e49affected · git
    • 66e3e591891da9899a8990792da080432531ffd4 and later · before abf76d3239dee97b66e7241ad04811f1ce562e28affected · git
    • before 4.1not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:12linux-6.12before 6.12.100-1~deb12u16.12.100-1~deb12u1
Debian:13linuxbefore 6.12.96-16.12.96-1
Debian:14linuxbefore 7.1.4-17.1.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-63984Jul 19, 2026 · ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
    39Monitor
  • ← EarlierCVE-2026-64454Jul 25, 2026 · usb: dwc3: run gadget disconnect from sleepable suspend context
    0Monitor
  • Later →CVE-2026-64456Jul 25, 2026 · hwrng: virtio: clamp device-reported used.len at copy_data()
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2a52d55c86a429dac47886b8424e67f90b001e67Vendor (CNA)
Linux Linux3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89Vendor (CNA)
Linux Linux5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023Vendor (CNA)
Linux Linux6c82f88bc7a8458d5c60f9b354c4d32d233f0cacVendor (CNA)
Linux Linux8f50613bff228272577893aa10a346a2f3063e49Vendor (CNA)
Linux Linuxabf76d3239dee97b66e7241ad04811f1ce562e28Vendor (CNA)
Linux Linuxf3e409476ad0703c54c14f245e4e143c8124e1bdVendor (CNA)
Linux Linuxfe7a0f4be283b40dd592540027279735120d0d6fVendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records