{"cve":"CVE-2025-21926","nvd":{"published":"2025-04-01T16:15:23.350","modified":"2026-10-15T02:17:42.080","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gso: fix ownership in __udp_gso_segment\n\nIn __udp_gso_segment the skb destructor is removed before segmenting the\nskb but the socket reference is kept as-is. This is an issue if the\noriginal skb is later orphaned as we can hit the following bug:\n\n  kernel BUG at ./include/linux/skbuff.h:3312!  (skb_orphan)\n  RIP: 0010:ip_rcv_core+0x8b2/0xca0\n  Call Trace:\n   ip_rcv+0xab/0x6e0\n   __netif_receive_skb_one_core+0x168/0x1b0\n   process_backlog+0x384/0x1100\n   __napi_poll.constprop.0+0xa1/0x370\n   net_rx_action+0x925/0xe50\n\nThe above can happen following a sequence of events when using\nOpenVSwitch, when an OVS_ACTION_ATTR_USERSPACE action precedes an\nOVS_ACTION_ATTR_OUTPUT action:\n\n1. OVS_ACTION_ATTR_USERSPACE is handled (in do_execute_actions): the skb\n   goes through queue_gso_packets and then __udp_gso_segment, where its\n   destructor is removed.\n2. The segments' data are copied and sent to userspace.\n3. OVS_ACTION_ATTR_OUTPUT is handled (in do_execute_actions) and the\n   same original skb is sent to its path.\n4. If it later hits skb_orphan, we hit the bug.\n\nFix this by also removing the reference to the socket in\n__udp_gso_segment.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/01a83237644d6822bc7df2c5564fc81b0df84358","https://git.kernel.org/stable/c/084819b0d8b1bd433b90142371eb9450d657f8ca","https://git.kernel.org/stable/c/455217ac9db0cf9349b3933664355e907bb1a569","https://git.kernel.org/stable/c/9f28205ddb76e86cac418332e952241d85fed0dc","https://git.kernel.org/stable/c/a2d1cca955ed34873e524cc2e6e885450d262f05"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:00:57.946988208+00:00"},"epss":{"cve":"CVE-2025-21926","score":0.00243,"percentile":0.15375,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}