CVE-2024-21803 Possible UAF in bt_accept_poll in Linux kernel

What is CVE-2024-21803?

CVE-2024-21803 is a low-severity use after free vulnerability in Linux kernel, published on 30 Jan 2024. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Use After Free vulnerability in Linux Linux kernel kernel on Linux, x86, ARM (bluetooth modules) allows Local Execution of Code. This vulnerability is associated with program files https://gitee.Com/anolis/cloud-kernel/blob/devel-5.10/net/bluetooth/af_bluetooth.C.

This issue affects Linux kernel: from v2.6.12-rc2 before v6.8-rc1.

Weakness: CWE-416

Which versions are affected by CVE-2024-21803?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-21803?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2024-21803 being exploited?

There is no known exploitation of CVE-2024-21803 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-34203, AZL-34875, DEBIAN-CVE-2024-21803, GHSA-c5mq-q8c8-ppcw, ROOT-OS-DEBIAN-11-CVE-2024-21803, ROOT-OS-DEBIAN-12-CVE-2024-21803 and 2 more.