PT-2026-47327 · Linux · Linux Kernel
CVE-2026-46275
·
Published
2026-06-08
·
Updated
2026-07-31
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
Use-After-Free (UAF) and Null Pointer Dereference (NPD) conditions exist in the lifecycle management of
hci uart. The issue occurs when workqueues init ready and write work are not flushed or cancelled during TTY close if the HCI UART PROTO READY flag is not set, leading to the dereferencing of a freed hu struct. Additionally, several race conditions and UAFs occur during teardown: calling hci uart flush() from hci uart close() without disabling write work can cause a double-free of hu->tx skb; calling hci free dev(hdev) before hu->proto->close(hu) leads to UAFs in vendor-specific callbacks; and failing to use the proto lock write lock when clearing PROTO READY in initialization error paths creates races with active readers. Furthermore, hci uart tty receive() accesses hu->hdev outside the read lock, potentially causing UAFs if hdev is freed concurrently.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Race Condition
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel