High 7.8Published Apr 1, 2025

CVE-2025-21926net: gso: fix ownership in __udp_gso_segment

Updated under an hour ago (2026-10-19 10:00 UTC)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ad405857b174ed31a97982bb129c320d03321cf5 before 9f28205ddb76e86cac418332e952241d85fed0dc; from ad405857b174ed31a97982bb129c320d03321cf5 before a2d1cca955ed34873e524cc2e6e885450d262f05; from ad405857b174ed31a97982bb129c320d03321cf5 before 455217ac9db0cf9349b3933664355e907bb1a569; from ad405857b174ed31a97982bb129c320d03321cf5 before e8db70537878e1bb3fd83e5abcc6feefc0587828; from ad405857b174ed31a97982bb129c320d03321cf5 before 01a83237644d6822bc7df2c5564fc81b0df84358; from ad405857b174ed31a97982bb129c320d03321cf5 before 084819b0d8b1bd433b90142371eb9450d657f8ca; from ad405857b174ed31a97982bb129c320d03321cf5 before c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b; from ad405857b174ed31a97982bb129c320d03321cf5 before ee01b2f2d7d0010787c2343463965bbc283a497f	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.18 before 5.4.291; from 5.5 before 5.10.235; from 5.11 before 5.15.179; from 5.16 before 6.1.131; from 6.2 before 6.6.83; from 6.7 before 6.12.19; from 6.13 before 6.13.7; 6.14; and 4 more ranges	NVD

References

https://git.kernel.org/stable/c/9f28205ddb76e86cac418332e952241d85fed0dcpatch
https://git.kernel.org/stable/c/a2d1cca955ed34873e524cc2e6e885450d262f05patch
https://git.kernel.org/stable/c/455217ac9db0cf9349b3933664355e907bb1a569patch
https://git.kernel.org/stable/c/e8db70537878e1bb3fd83e5abcc6feefc0587828patch
https://git.kernel.org/stable/c/01a83237644d6822bc7df2c5564fc81b0df84358patch
https://git.kernel.org/stable/c/084819b0d8b1bd433b90142371eb9450d657f8capatch
https://git.kernel.org/stable/c/c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11bpatch
https://git.kernel.org/stable/c/ee01b2f2d7d0010787c2343463965bbc283a497fpatch
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.