CVE-2025-21926

MEDIUM EPSS 8.4%
Published Apr 1, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Apr 1, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
8.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥4.18  –  <5.4.291
linuxlinux_kernel*≥5.5  –  <5.10.235
linuxlinux_kernel*≥5.11  –  <5.15.179
linuxlinux_kernel*≥5.16  –  <6.1.131
linuxlinux_kernel*≥6.2  –  <6.6.83
linuxlinux_kernel*≥6.7  –  <6.12.19
linuxlinux_kernel*≥6.13  –  <6.13.7
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any

References 10

  • git.kernel.org https://git.kernel.org/stable/c/01a83237644d6822bc7df2c5564fc81b0df84358
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/084819b0d8b1bd433b90142371eb9450d657f8ca
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/455217ac9db0cf9349b3933664355e907bb1a569
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9f28205ddb76e86cac418332e952241d85fed0dc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a2d1cca955ed34873e524cc2e6e885450d262f05
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8db70537878e1bb3fd83e5abcc6feefc0587828
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ee01b2f2d7d0010787c2343463965bbc283a497f
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/01a83237644d6822bc7df2c5564fc81b0df84358
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/084819b0d8b1bd433b90142371eb9450d657f8ca
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/455217ac9db0cf9349b3933664355e907bb1a569
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9f28205ddb76e86cac418332e952241d85fed0dc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a2d1cca955ed34873e524cc2e6e885450d262f05
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8db70537878e1bb3fd83e5abcc6feefc0587828
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ee01b2f2d7d0010787c2343463965bbc283a497f
    Patch