Debian: CVE-2021-47413: linux -- security update

Debian: CVE-2021-47413: linux -- security update

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

05/21/2024

Created

07/31/2024

Added

07/30/2024

Modified

01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: usb: chipidea: ci_hdrc_imx: Also search for 'phys' phandle When passing 'phys' in the devicetree to describe the USB PHY phandle (which is the recommended way according to Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt) the following NULL pointer dereference is observed on i.MX7 and i.MX8MM: [1.489344] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098 [1.498170] Mem abort info: [1.500966] ESR = 0x96000044 [1.504030] EC = 0x25: DABT (current EL), IL = 32 bits [1.509356] SET = 0, FnV = 0 [1.512416] EA = 0, S1PTW = 0 [1.515569] FSC = 0x04: level 0 translation fault [1.520458] Data abort info: [1.523349] ISV = 0, ISS = 0x00000044 [1.527196] CM = 0, WnR = 1 [1.530176] [0000000000000098] user address but active_mm is swapper [1.536544] Internal error: Oops: 96000044 [#1] PREEMPT SMP [1.542125] Modules linked in: [1.545190] CPU: 3 PID: 7 Comm: kworker/u8:0 Not tainted 5.14.0-dirty #3 [1.551901] Hardware name: Kontron i.MX8MM N801X S (DT) [1.557133] Workqueue: events_unbound deferred_probe_work_func [1.562984] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--) [1.568998] pc : imx7d_charger_detection+0x3f0/0x510 [1.573973] lr : imx7d_charger_detection+0x22c/0x510 This happens because the charger functions check for the phy presence inside the imx_usbmisc_data structure (data->usb_phy), but the chipidea core populates the usb_phy passed via 'phys' inside 'struct ci_hdrc' (ci->usb_phy) instead. This causes the NULL pointer dereference inside imx7d_charger_detection(). Fix it by also searching for 'phys' in case 'fsl,usbphy' is not found. Tested on a imx7s-warp board.

Solution(s)

• debian-upgrade-linux

References

• https://attackerkb.com/topics/cve-2021-47413
• CVE - 2021-47413