CVE-2024-26886: Bluetooth: af_bluetooth: Fix deadlock
First published: Wed Apr 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: af_bluetooth: Fix deadlock Attemting to do sock_lock on .recvmsg may cause a deadlock as shown bellow, so instead of using sock_sock this uses sk_receive_queue.lock on bt_sock_ioctl to avoid the UAF: INFO: task kworker/u9:1:121 blocked for more than 30 seconds. Not tainted 6.7.6-lemon #183 Workqueue: hci0 hci_rx_work Call Trace: <TASK> __schedule+0x37d/0xa00 schedule+0x32/0xe0 __lock_sock+0x68/0xa0 ? __pfx_autoremove_wake_function+0x10/0x10 lock_sock_nested+0x43/0x50 l2cap_sock_recv_cb+0x21/0xa0 l2cap_recv_frame+0x55b/0x30a0 ? psi_task_switch+0xeb/0x270 ? finish_task_switch.isra.0+0x93/0x2a0 hci_rx_work+0x33a/0x3f0 process_one_work+0x13a/0x2f0 worker_thread+0x2f0/0x410 ? __pfx_worker_thread+0x10/0x10 kthread+0xe0/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2c/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK>
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.83 | 6.1.83 |
| redhat/kernel | <6.6.23 | 6.6.23 |
| redhat/kernel | <6.7.11 | 6.7.11 |
| redhat/kernel | <6.8.2 | 6.8.2 |
| redhat/kernel | <6.9 | 6.9 |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 |
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Reference Links
- https://git.kernel.org/stable/c/2c9e2df022ef8b9d7fac58a04a2ef4ed25288955
- https://git.kernel.org/stable/c/64be3c6154886200708da0dfe259705fb992416c
- https://git.kernel.org/stable/c/817e8138ce86001b2fa5c63d6ede756e205a01f7
- https://git.kernel.org/stable/c/cb8adca52f306563d958a863bb0cbae9c184d1ae
- https://git.kernel.org/stable/c/f7b94bdc1ec107c92262716b073b3e816d4784fb
- https://launchpad.net/bugs/cve/CVE-2024-26886
- https://access.redhat.com/security/cve/CVE-2024-26886
- https://lore.kernel.org/linux-cve-announce/2024041742-CVE-2024-26886-6345@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2275679
- https://access.redhat.com/errata/RHSA-2024:6567
- https://access.redhat.com/errata/RHSA-2024:6745
- https://access.redhat.com/errata/RHSA-2024:6744
- https://bugzilla.redhat.com/show_bug.cgi?id=2275678
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26886
- https://nvd.nist.gov/vuln/detail/CVE-2024-26886
- https://security-tracker.debian.org/tracker/CVE-2024-26886
- https://ubuntu.com/security/CVE-2024-26886
- https://git.kernel.org/linus/f7b94bdc1ec107c92262716b073b3e816d4784fb
Frequently Asked Questions
What is the severity of CVE-2024-26886?
CVE-2024-26886 has been classified as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2024-26886?
To mitigate CVE-2024-26886, update the kernel to version 6.1.83, 6.6.23, 6.7.11, 6.8.2, or 6.9 for Red Hat, or the specified versions for Debian.
What impact does CVE-2024-26886 have on Linux systems?
CVE-2024-26886 can potentially lead to a deadlock when using the Bluetooth socket, affecting system stability.
Is CVE-2024-26886 present in all versions of the Linux kernel?
CVE-2024-26886 affects specific versions of the Linux kernel, primarily those prior to the patched releases.
Who is affected by CVE-2024-26886?
Users running affected versions of the Linux kernel on their systems are at risk for CVE-2024-26886.
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