vulnerability

Ubuntu: (Multiple Advisories) (CVE-2025-21821): Linux kernel vulnerabilities

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
Feb 27, 2025
Added
May 21, 2025
Modified
May 29, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

fbdev: omap: use threaded IRQ for LCD DMA

When using touchscreen and framebuffer, Nokia 770 crashes easily with:

BUG: scheduling while atomic: irq/144-ads7846/82/0x00010000
Modules linked in: usb_f_ecm g_ether usb_f_rndis u_ether libcomposite configfs omap_udc ohci_omap ohci_hcd
CPU: 0 UID: 0 PID: 82 Comm: irq/144-ads7846 Not tainted 6.12.7-770 #2
Hardware name: Nokia 770
Call trace:
unwind_backtrace from show_stack+0x10/0x14
show_stack from dump_stack_lvl+0x54/0x5c
dump_stack_lvl from __schedule_bug+0x50/0x70
__schedule_bug from __schedule+0x4d4/0x5bc
__schedule from schedule+0x34/0xa0
schedule from schedule_preempt_disabled+0xc/0x10
schedule_preempt_disabled from __mutex_lock.constprop.0+0x218/0x3b4
__mutex_lock.constprop.0 from clk_prepare_lock+0x38/0xe4
clk_prepare_lock from clk_set_rate+0x18/0x154
clk_set_rate from sossi_read_data+0x4c/0x168
sossi_read_data from hwa742_read_reg+0x5c/0x8c
hwa742_read_reg from send_frame_handler+0xfc/0x300
send_frame_handler from process_pending_requests+0x74/0xd0
process_pending_requests from lcd_dma_irq_handler+0x50/0x74
lcd_dma_irq_handler from __handle_irq_event_percpu+0x44/0x130
__handle_irq_event_percpu from handle_irq_event+0x28/0x68
handle_irq_event from handle_level_irq+0x9c/0x170
handle_level_irq from generic_handle_domain_irq+0x2c/0x3c
generic_handle_domain_irq from omap1_handle_irq+0x40/0x8c
omap1_handle_irq from generic_handle_arch_irq+0x28/0x3c
generic_handle_arch_irq from call_with_stack+0x1c/0x24
call_with_stack from __irq_svc+0x94/0xa8
Exception stack(0xc5255da0 to 0xc5255de8)
5da0: 00000001 c22fc620 00000000 00000000 c08384a8 c106fc00 00000000 c240c248
5dc0: c113a600 c3f6ec30 00000001 00000000 c22fc620 c5255df0 c22fc620 c0279a94
5de0: 60000013 ffffffff
__irq_svc from clk_prepare_lock+0x4c/0xe4
clk_prepare_lock from clk_get_rate+0x10/0x74
clk_get_rate from uwire_setup_transfer+0x40/0x180
uwire_setup_transfer from spi_bitbang_transfer_one+0x2c/0x9c
spi_bitbang_transfer_one from spi_transfer_one_message+0x2d0/0x664
spi_transfer_one_message from __spi_pump_transfer_message+0x29c/0x498
__spi_pump_transfer_message from __spi_sync+0x1f8/0x2e8
__spi_sync from spi_sync+0x24/0x40
spi_sync from ads7846_halfd_read_state+0x5c/0x1c0
ads7846_halfd_read_state from ads7846_irq+0x58/0x348
ads7846_irq from irq_thread_fn+0x1c/0x78
irq_thread_fn from irq_thread+0x120/0x228
irq_thread from kthread+0xc8/0xe8
kthread from ret_from_fork+0x14/0x28

As a quick fix, switch to a threaded IRQ which provides a stable system.

Solution(s)

ubuntu-upgrade-linux-image-6-11-0-1010-realtimeubuntu-upgrade-linux-image-6-11-0-1013-raspiubuntu-upgrade-linux-image-6-11-0-1014-awsubuntu-upgrade-linux-image-6-11-0-1014-lowlatencyubuntu-upgrade-linux-image-6-11-0-1014-lowlatency-64kubuntu-upgrade-linux-image-6-11-0-1015-azureubuntu-upgrade-linux-image-6-11-0-1015-azure-fdeubuntu-upgrade-linux-image-6-11-0-1015-gcpubuntu-upgrade-linux-image-6-11-0-1015-gcp-64kubuntu-upgrade-linux-image-6-11-0-1016-oracleubuntu-upgrade-linux-image-6-11-0-1016-oracle-64kubuntu-upgrade-linux-image-6-11-0-1022-oemubuntu-upgrade-linux-image-6-11-0-26-genericubuntu-upgrade-linux-image-6-11-0-26-generic-64kubuntu-upgrade-linux-image-awsubuntu-upgrade-linux-image-azureubuntu-upgrade-linux-image-azure-fdeubuntu-upgrade-linux-image-gcpubuntu-upgrade-linux-image-gcp-64kubuntu-upgrade-linux-image-genericubuntu-upgrade-linux-image-generic-64kubuntu-upgrade-linux-image-generic-64k-hwe-24-04ubuntu-upgrade-linux-image-generic-hwe-24-04ubuntu-upgrade-linux-image-lowlatencyubuntu-upgrade-linux-image-lowlatency-64kubuntu-upgrade-linux-image-lowlatency-64k-hwe-24-04ubuntu-upgrade-linux-image-lowlatency-hwe-24-04ubuntu-upgrade-linux-image-oem-24-04bubuntu-upgrade-linux-image-oracleubuntu-upgrade-linux-image-oracle-64kubuntu-upgrade-linux-image-raspiubuntu-upgrade-linux-image-realtimeubuntu-upgrade-linux-image-virtualubuntu-upgrade-linux-image-virtual-hwe-24-04
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