Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: serial: 8250_bcm7271: fix use-after-free in brcmuart_remove() brcmuart_handle_irq() starts priv->hrt to work around a receive-timeout quirk of the 8250 core when hardware flow control is enabled; the timer callback brcmuart_hrtimer_func() dereferences priv. brcmuart_remove() cancels the hrtimer before it unregisters the port, so a receive-timeout interrupt that arrives in between re-arms the timer. After devm frees priv, the callback runs on freed memory. Unregister the port before cancelling the hrtimer. serial8250_unregister_port() shuts the port down and frees its IRQ, so brcmuart_handle_irq() can no longer restart the timer, and the final hrtimer_cancel() drains any timer that was armed before or during the unregister. This issue was found by an in-house static analysis tool.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 41a469482de257ea8db43cf74b6311bd055de030 before dd81650bec58ac70e5dfde2ec390acc1f0d1ed76; affected 41a469482de257ea8db43cf74b6311bd055de030 before f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e; affected 41a469482de257ea8db43cf74b6311bd055de030 before e32440fa536af96bdbc61d933a7c3a920b965edc; affected 41a469482de257ea8db43cf74b6311bd055de030 before 0794ba5332754866b2f1c0cca668775be3ffcf0a; affected 41a469482de257ea8db43cf74b6311bd055de030 before 189b9dc8c96ec9486482f27c1372b04a7152175e |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/dd81650bec58ac70e5dfde2ec390acc1f0d1ed76
- https://git.kernel.org/stable/c/f5ce06e648d775cc1ccf66f4f594bb8b559a7d8e
- https://git.kernel.org/stable/c/e32440fa536af96bdbc61d933a7c3a920b965edc
- https://git.kernel.org/stable/c/0794ba5332754866b2f1c0cca668775be3ffcf0a
- https://git.kernel.org/stable/c/189b9dc8c96ec9486482f27c1372b04a7152175e