CVE-2025-21926 (GCVE-0-2025-21926)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2025-11-03 19:39
VLAI?
Title
net: gso: fix ownership in __udp_gso_segment
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < 9f28205ddb76e86cac418332e952241d85fed0dc (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < a2d1cca955ed34873e524cc2e6e885450d262f05 (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < 455217ac9db0cf9349b3933664355e907bb1a569 (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < e8db70537878e1bb3fd83e5abcc6feefc0587828 (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < 01a83237644d6822bc7df2c5564fc81b0df84358 (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < 084819b0d8b1bd433b90142371eb9450d657f8ca (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < ee01b2f2d7d0010787c2343463965bbc283a497f (git)
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    Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.131 , ≤ 6.1.* (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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          "value": "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\u0027 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."
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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