Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: fix race in read_unconf_index_list() read_unconf_index_list() counts unconfigured controllers before allocating its response, then checks the device flags again while filling it. hci_dev_list_lock stabilizes list membership, but it does not serialize the per-device flags. During asynchronous controller setup, the worker can set HCI_UNCONFIGURED and clear HCI_SETUP between the two passes. A controller omitted from the allocation count can then become eligible for the fill pass, causing an out-of-bounds write to rp->index[]. Allocate space for every device on hci_dev_list. Since list membership cannot change while hci_dev_list_lock is held, the response remains large enough regardless of flag transitions. The reported count and response length still include only eligible unconfigured controllers.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• git.kernel.org/stable/c/2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1
• git.kernel.org/stable/c/416546cd6a54e9b68f2b91bc680b1ee17dcd77a1
• git.kernel.org/stable/c/524e0450dd9a396f99a81b045219b0e2ea0dab57
• git.kernel.org/stable/c/8ddf962c76432a10a6cb80042875cbc48a9c056b
• git.kernel.org/stable/c/b5dbb41b212c50c095a4dbee3017a84fe94f033b