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CVE-2024-27021: r8169: fix LED-related deadlock on module removal

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-01 · updated 2026-06-17
• Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: r8169: fix LED-related deadlock on module removal Binding devm_led_classdev_register() to the netdev is problematic because on module removal we get a RTNL-related deadlock. Fix this by avoiding the device-managed LED functions. Note: We can safely call led_classdev_unregister() for a LED even if registering it failed, because led_classdev_unregister() detects this and is a no-op in this case.

Affected products

• Fedoraproject Fedora: 38, 39, 40
• Linux kernel: from 6.8 before 6.8.8; 6.9-rc1, 6.9-rc2, 6.9-rc3 — fixed in 6.8.8

How to fix

Upgrade to a fixed version: Linux kernel 6.8.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/19fa4f2a85d777a8052e869c1b892a2f7556569d
• https://git.kernel.org/stable/c/53d986f39acd8ea11c9e460732bfa5add66360d9
• https://git.kernel.org/stable/c/19fa4f2a85d777a8052e869c1b892a2f7556569d
• https://git.kernel.org/stable/c/53d986f39acd8ea11c9e460732bfa5add66360d9
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/

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