CVE-2025-21821— fbdev: omap: use threaded IRQ for LCD DMA
Possible ATT&CK Techniques 1AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c73b9099da4fb5703abaa804a0377850eea66cb5< 7bbbd311dd503653a2cc86d9226740883051dc92 | affected |
c73b9099da4fb5703abaa804a0377850eea66cb5< fb6a5edb60921887d7d10619fcdcbee9759552cb | affected | ||
c73b9099da4fb5703abaa804a0377850eea66cb5< aa8e22cbedeb626f2a6bda0aea362353d627cd0a | affected | ||
c73b9099da4fb5703abaa804a0377850eea66cb5< 8392ea100f0b86c234c739c6662f39f0ccc0cefd | affected | ||
c73b9099da4fb5703abaa804a0377850eea66cb5< e4b6b665df815b4841e71b72f06446884e8aad40 | affected | ||
5.19 | affected | ||
< 5.19 | unaffected | ||
6.1.129≤ 6.1.* | unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2025-21821
Vulnerability Information
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Vulnerability Title
fbdev: omap: use threaded IRQ for LCD DMA
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于使用非线程化IRQ处理LCD DMA，可能导致调度问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-21821
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2025-21821 (5)
Same Patch Batch · Linux · 2025-02-27 · 177 CVEs total
| CVE-2025-21805 | 9.8 CRITICAL | RDMA/rtrs: Add missing deinit() call |
| CVE-2025-21707 | 9.8 CRITICAL | mptcp: consolidate suboption status |
| CVE-2025-21796 | 9.8 CRITICAL | nfsd: clear acl_access/acl_default after releasing them |
| CVE-2025-21748 | 9.8 CRITICAL | ksmbd: fix integer overflows on 32 bit systems |
| CVE-2025-21735 | 8.8 HIGH | NFC: nci: Add bounds checking in nci_hci_create_pipe() |
| CVE-2025-21710 | 8.2 HIGH | tcp: correct handling of extreme memory squeeze |
| CVE-2025-21760 | 8.1 HIGH | ndisc: extend RCU protection in ndisc_send_skb() |
| CVE-2025-21766 | 8.1 HIGH | ipv4: use RCU protection in __ip_rt_update_pmtu() |
| CVE-2025-21762 | 8.1 HIGH | arp: use RCU protection in arp_xmit() |
| CVE-2025-21765 | 8.1 HIGH | ipv6: use RCU protection in ip6_default_advmss() |
| CVE-2025-21764 | 7.8 HIGH | ndisc: use RCU protection in ndisc_alloc_skb() |
| CVE-2025-21758 | 7.8 HIGH | ipv6: mcast: add RCU protection to mld_newpack() |
| CVE-2025-21761 | 7.8 HIGH | openvswitch: use RCU protection in ovs_vport_cmd_fill_info() |
| CVE-2025-21763 | 7.8 HIGH | neighbour: use RCU protection in __neigh_notify() |
| CVE-2025-21738 | 7.8 HIGH | ata: libata-sff: Ensure that we cannot write outside the allocated buffer |
| CVE-2025-21722 | 7.8 HIGH | nilfs2: do not force clear folio if buffer is referenced |
| CVE-2025-21718 | 7.8 HIGH | net: rose: fix timer races against user threads |
| CVE-2025-21734 | 7.8 HIGH | misc: fastrpc: Fix copy buffer page size |
| CVE-2025-21714 | 7.8 HIGH | RDMA/mlx5: Fix implicit ODP use after free |
| CVE-2025-21709 | 7.8 HIGH | kernel: be more careful about dup_mmap() failures and uprobe registering |
Showing top 20 of 177 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
Same vendor: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
V. Comments for CVE-2025-21821
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