CVE - CVE-2025-21926

CVE-ID
CVE-2025-21926	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: net: gso: fix ownership in __udp_gso_segment In __udp_gso_segment the skb destructor is removed before segmenting the skb but the socket reference is kept as-is. This is an issue if the original skb is later orphaned as we can hit the following bug: kernel BUG at ./include/linux/skbuff.h:3312! (skb_orphan) RIP: 0010:ip_rcv_core+0x8b2/0xca0 Call Trace: ip_rcv+0xab/0x6e0 __netif_receive_skb_one_core+0x168/0x1b0 process_backlog+0x384/0x1100 __napi_poll.constprop.0+0xa1/0x370 net_rx_action+0x925/0xe50 The above can happen following a sequence of events when using OpenVSwitch, when an OVS_ACTION_ATTR_USERSPACE action precedes an OVS_ACTION_ATTR_OUTPUT action: 1. OVS_ACTION_ATTR_USERSPACE is handled (in do_execute_actions): the skb goes through queue_gso_packets and then __udp_gso_segment, where its destructor is removed. 2. The segments' data are copied and sent to userspace. 3. OVS_ACTION_ATTR_OUTPUT is handled (in do_execute_actions) and the same original skb is sent to its path. 4. If it later hits skb_orphan, we hit the bug. Fix this by also removing the reference to the socket in __udp_gso_segment.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/01a83237644d6822bc7df2c5564fc81b0df84358 URL:https://git.kernel.org/stable/c/01a83237644d6822bc7df2c5564fc81b0df84358 MISC:https://git.kernel.org/stable/c/084819b0d8b1bd433b90142371eb9450d657f8ca URL:https://git.kernel.org/stable/c/084819b0d8b1bd433b90142371eb9450d657f8ca MISC:https://git.kernel.org/stable/c/455217ac9db0cf9349b3933664355e907bb1a569 URL:https://git.kernel.org/stable/c/455217ac9db0cf9349b3933664355e907bb1a569 MISC:https://git.kernel.org/stable/c/9f28205ddb76e86cac418332e952241d85fed0dc URL:https://git.kernel.org/stable/c/9f28205ddb76e86cac418332e952241d85fed0dc MISC:https://git.kernel.org/stable/c/a2d1cca955ed34873e524cc2e6e885450d262f05 URL:https://git.kernel.org/stable/c/a2d1cca955ed34873e524cc2e6e885450d262f05 MISC:https://git.kernel.org/stable/c/c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b URL:https://git.kernel.org/stable/c/c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b MISC:https://git.kernel.org/stable/c/e8db70537878e1bb3fd83e5abcc6feefc0587828 URL:https://git.kernel.org/stable/c/e8db70537878e1bb3fd83e5abcc6feefc0587828 MISC:https://git.kernel.org/stable/c/ee01b2f2d7d0010787c2343463965bbc283a497f URL:https://git.kernel.org/stable/c/ee01b2f2d7d0010787c2343463965bbc283a497f
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)