CVE-2025-21820— tty: xilinx_uartps: split sysrq handling
Affected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 74ea66d4ca061a3cd4c0e924e51b60e924644852< e22a97700901ba5e8bf8db68056a0d50f9440cae | affected |
74ea66d4ca061a3cd4c0e924e51b60e924644852< de5bd24197bd9ee37ec1e379a3d882bbd15c5065 | affected | ||
74ea66d4ca061a3cd4c0e924e51b60e924644852< 8ea0e7b3d7b8f2f0fc9db491ff22a0abe120801c | affected | ||
74ea66d4ca061a3cd4c0e924e51b60e924644852< 9b88a7c4584ba67267a051069b8abe44fc9595b2 | affected | ||
74ea66d4ca061a3cd4c0e924e51b60e924644852< 4410dba9807a17a93f649a9f5870ceaf30a675a3 | affected | ||
74ea66d4ca061a3cd4c0e924e51b60e924644852< b06f388994500297bb91be60ffaf6825ecfd2afe | affected | ||
4.6 | affected | ||
< 4.6 | unaffected | ||
| … +6 more rows | |||
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2025-21820
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
tty: xilinx_uartps: split sysrq handling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tty: xilinx_uartps: split sysrq handling lockdep detects the following circular locking dependency: CPU 0 CPU 1 ========================== ============================ cdns_uart_isr() printk() uart_port_lock(port) console_lock() cdns_uart_console_write() if (!port->sysrq) uart_port_lock(port) uart_handle_break() port->sysrq = ... uart_handle_sysrq_char() printk() console_lock() The fixed commit attempts to avoid this situation by only taking the port lock in cdns_uart_console_write if port->sysrq unset. However, if (as shown above) cdns_uart_console_write runs before port->sysrq is set, then it will try to take the port lock anyway. This may result in a deadlock. Fix this by splitting sysrq handling into two parts. We use the prepare helper under the port lock and defer handling until we release the lock.
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cdns_uart_console_write函数中未正确处理sysrq，可能导致死锁。
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-2025-21820
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2025-21820
请登录查看更多情报信息。
Patches & Fixes for CVE-2025-21820 (5)
Other References for CVE-2025-21820 (1)
Same Patch Batch · Linux · 2025-02-27 · 177 CVEs total
| CVE-2025-21805 | 9.8 CRITICAL | RDMA/rtrs: Add missing deinit() call |
| CVE-2025-21796 | 9.8 CRITICAL | nfsd: clear acl_access/acl_default after releasing them |
| CVE-2025-21707 | 9.8 CRITICAL | mptcp: consolidate suboption status |
| CVE-2025-21748 | 9.8 CRITICAL | ksmbd: fix integer overflows on 32 bit systems |
| CVE-2024-58006 | 9.6 CRITICAL | PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar() |
| CVE-2024-57999 | 8.8 HIGH | powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW |
| CVE-2025-21735 | 8.8 HIGH | NFC: nci: Add bounds checking in nci_hci_create_pipe() |
| CVE-2024-57997 | 8.8 HIGH | wifi: wcn36xx: fix channel survey memory allocation size |
| CVE-2024-57995 | 8.8 HIGH | wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev() |
| CVE-2025-21710 | 8.2 HIGH | tcp: correct handling of extreme memory squeeze |
| CVE-2025-21766 | 8.1 HIGH | ipv4: use RCU protection in __ip_rt_update_pmtu() |
| CVE-2024-57973 | 8.1 HIGH | rdma/cxgb4: Prevent potential integer overflow on 32bit |
| CVE-2025-21765 | 8.1 HIGH | ipv6: use RCU protection in ip6_default_advmss() |
| CVE-2025-21760 | 8.1 HIGH | ndisc: extend RCU protection in ndisc_send_skb() |
| CVE-2025-21762 | 8.1 HIGH | arp: use RCU protection in arp_xmit() |
| CVE-2024-58010 | 7.8 HIGH | binfmt_flat: Fix integer overflow bug on 32 bit systems |
| CVE-2024-58008 | 7.8 HIGH | KEYS: trusted: dcp: fix improper sg use with CONFIG_VMAP_STACK=y |
| CVE-2025-21764 | 7.8 HIGH | ndisc: use RCU protection in ndisc_alloc_skb() |
| CVE-2025-21791 | 7.8 HIGH | vrf: use RCU protection in l3mdev_l3_out() |
| CVE-2025-21763 | 7.8 HIGH | neighbour: use RCU protection in __neigh_notify() |
Showing top 20 of 177 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
Same vendor: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
V. Comments for CVE-2025-21820
No comments yet