CVE-2025-21954— netmem: prevent TX of unreadable skbs
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I. Basic Information for CVE-2025-21954
Vulnerability Information
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Vulnerability Title
netmem: prevent TX of unreadable skbs
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netmem: prevent TX of unreadable skbs Currently on stable trees we have support for netmem/devmem RX but not TX. It is not safe to forward/redirect an RX unreadable netmem packet into the device's TX path, as the device may call dma-mapping APIs on dma addrs that should not be passed to it. Fix this by preventing the xmit of unreadable skbs. Tested by configuring tc redirect: sudo tc qdisc add dev eth1 ingress sudo tc filter add dev eth1 ingress protocol ip prio 1 flower ip_proto \ tcp src_ip 192.168.1.12 action mirred egress redirect dev eth1 Before, I see unreadable skbs in the driver's TX path passed to dma mapping APIs. After, I don't see unreadable skbs in the driver's TX path passed to dma mapping APIs.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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netmem允许传输不可读skb可能导致DMA映射问题。
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-2025-21954
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Same Patch Batch · Linux · 2025-04-01 · 93 CVEs total
| CVE-2025-21947 | 8.1 HIGH | ksmbd: fix type confusion via race condition when using ipc_msg_send_request |
| CVE-2025-21925 | llc: do not use skb_get() before dev_queue_xmit() | |
| CVE-2025-21931 | hwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio | |
| CVE-2025-21934 | rapidio: fix an API misues when rio_add_net() fails | |
| CVE-2025-21935 | rapidio: add check for rio_add_net() in rio_scan_alloc_net() | |
| CVE-2025-21937 | Bluetooth: Add check for mgmt_alloc_skb() in mgmt_remote_name() | |
| CVE-2025-21936 | Bluetooth: Add check for mgmt_alloc_skb() in mgmt_device_connected() | |
| CVE-2025-21939 | drm/xe/hmm: Don't dereference struct page pointers without notifier lock | |
| CVE-2025-21933 | arm: pgtable: fix NULL pointer dereference issue | |
| CVE-2025-21927 | nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu() | |
| CVE-2025-21926 | net: gso: fix ownership in __udp_gso_segment | |
| CVE-2025-21928 | HID: intel-ish-hid: Fix use-after-free issue in ishtp_hid_remove() | |
| CVE-2025-21924 | net: hns3: make sure ptp clock is unregister and freed if hclge_ptp_get_cycle returns an e | |
| CVE-2025-21922 | ppp: Fix KMSAN uninit-value warning with bpf | |
| CVE-2025-21923 | HID: hid-steam: Fix use-after-free when detaching device | |
| CVE-2025-21920 | vlan: enforce underlying device type | |
| CVE-2025-21921 | net: ethtool: netlink: Allow NULL nlattrs when getting a phy_device | |
| CVE-2025-21919 | sched/fair: Fix potential memory corruption in child_cfs_rq_on_list | |
| CVE-2025-21918 | usb: typec: ucsi: Fix NULL pointer access | |
| CVE-2025-21917 | usb: renesas_usbhs: Flush the notify_hotplug_work |
Showing top 20 of 93 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-21954
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