cbcvebase.
CVE-2025-21926
published 2025-04-01

CVE-2025-21926: 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…

PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.22%
13.1th percentile
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.

Affected

30 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.133-1 (bookworm)linux 6.1.133-1 (bookworm)
debianlinux-6.1< linux 6.1.133-1 (bookworm)linux 6.1.133-1 (bookworm)
linuxlinux
linuxlinux>= ad405857b174ed31a97982bb129c320d03321cf5 < 9f28205ddb76e86cac418332e952241d85fed0dc9f28205ddb76e86cac418332e952241d85fed0dc
linuxlinux>= ad405857b174ed31a97982bb129c320d03321cf5 < a2d1cca955ed34873e524cc2e6e885450d262f05a2d1cca955ed34873e524cc2e6e885450d262f05
linuxlinux>= ad405857b174ed31a97982bb129c320d03321cf5 < 455217ac9db0cf9349b3933664355e907bb1a569455217ac9db0cf9349b3933664355e907bb1a569
linuxlinux>= ad405857b174ed31a97982bb129c320d03321cf5 < e8db70537878e1bb3fd83e5abcc6feefc0587828e8db70537878e1bb3fd83e5abcc6feefc0587828
linuxlinux>= ad405857b174ed31a97982bb129c320d03321cf5 < 01a83237644d6822bc7df2c5564fc81b0df8435801a83237644d6822bc7df2c5564fc81b0df84358
linuxlinux>= ad405857b174ed31a97982bb129c320d03321cf5 < 084819b0d8b1bd433b90142371eb9450d657f8ca084819b0d8b1bd433b90142371eb9450d657f8ca
linuxlinux>= ad405857b174ed31a97982bb129c320d03321cf5 < c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11bc32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b
linuxlinux>= ad405857b174ed31a97982bb129c320d03321cf5 < ee01b2f2d7d0010787c2343463965bbc283a497fee01b2f2d7d0010787c2343463965bbc283a497f
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.237-15.10.237-1
linuxlinux_kernel>= 0 < 6.1.133-16.1.133-1
linuxlinux_kernel>= 0 < 6.12.19-16.12.19-1
linuxlinux_kernel>= 0 < 6.12.19-16.12.19-1
linuxlinux_kernel>= 0 < 5.4.0-216.2365.4.0-216.236
linuxlinux_kernel>= 0 < 5.15.0-140.1505.15.0-140.150
linuxlinux_kernel>= 0 < 6.8.0-84.846.8.0-84.84
linuxlinux_kernel>= 4.18 < 5.4.2915.4.291
linuxlinux_kernel>= 5.11 < 5.15.1795.15.179

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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