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CVE-2026-74302

HIGHCVSS 7.8/10EPSS 0.17%

Last modified

CVE-2026-74302 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix UAF in hci_unregister_dev() hci_unregister_dev() does not disable cmd_timer and ncmd_timer before the hci_dev structure is freed. If a timeout fires during device teardown, the callback dereferences freed memory (including the hdev->reset function pointer), leading to a use-after-free. Add disable_delayed_work_sync() calls alongside the existing disable_work_sync() calls to ensure both timers are fully quiesced before teardown proceeds.. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix UAF in hci_unregister_dev() hci_unregister_dev() does not disable cmd_timer and ncmd_timer before the hci_dev structure is freed. If a timeout fires during device teardown, the callback dereferences freed memory (including the hdev->reset function pointer), leading to a use-after-free. Add disable_delayed_work_sync() calls alongside the existing disable_work_sync() calls to ensure both timers are fully quiesced before teardown proceeds.

Metrics

CVSS 3.1
7.8/10

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

EPSS Probability
0.17%

6.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 0d151a103775dd9645c78c97f77d6e2a5298d913, < 48c7ad6afcc58c2cda11fed39791708103b6a644; >= 0d151a103775dd9645c78c97f77d6e2a5298d913, < a0fd1086a57b982f8c24ae4ab165c2af39fe1735; >= 0d151a103775dd9645c78c97f77d6e2a5298d913, < 672d52d9412252e61b8de8d773ccdf5a277cf540; >= 0d151a103775dd9645c78c97f77d6e2a5298d913, < 5edcc018fa6e80b2c478454a4a8229c23d67c181; 48542881997e17b49dc16b93fe910e0cfcf7a9f9; 9cfc84b1d464cc024286f42a090718f9067b80ed; ddeda6ca5f218b668b560d90fc31ae469adbfd92; d2ce562a5aff1dcd0c50d9808ea825ef90da909f; 96600c2e5ee8213dbab5df1617293d8e847bb4fa; d6cbce18370641a21dd889e8613d8153df15eb39; 3f939bd73fed12dddc2a32a76116c19ca47c7678; >= 4.19.319, < 4.20; >= 5.4.281, < 5.5; >= 5.10.223, < 5.11; >= 5.15.164, < 5.16; >= 6.1.101, < 6.2; >= 6.6.42, < 6.7; >= 6.9.11, < 6.10
LinuxLinux6.10

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74302?
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix UAF in hci_unregister_dev() hci_unregister_dev() does not disable cmd_timer and ncmd_timer before the hci_dev structure is freed. If a timeout fires during device teardown, the callback dereferences freed memory (including the hdev->reset function pointer), leading to a use-after-free. Add disable_delayed_work_sync() calls alongside the existing disable_work_sync() calls to ensure both timers are fully quiesced before teardown proceeds.
How severe is CVE-2026-74302?
CVE-2026-74302 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74302?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST