In the Linux kernel, the following vulnerability has been resolved:
bpf, cpumap: Handle skb as well when clean up ptr_ring
The following warning was reported when running xdp_redirect_cpu with both skb-mode and stress-mode enabled:
------------[ cut here ]------------ Incorrect XDP memory type (-2128176192) usage WARNING: CPU: 7 PID: 1442 at net/core/xdp.c:405 Modules linked in: CPU: 7 PID: 1442 Comm: kworker/7:0 Tainted: G 6.5.0-rc2+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: events __cpu_map_entry_free RIP: 0010:__xdp_return+0x1e4/0x4a0 ...... Call Trace: <TASK> ? show_regs+0x65/0x70 ? __warn+0xa5/0x240 ? __xdp_return+0x1e4/0x4a0 ...... xdp_return_frame+0x4d/0x150 __cpu_map_entry_free+0xf9/0x230 process_one_work+0x6b0/0xb80 worker_thread+0x96/0x720 kthread+0x1a5/0x1f0 ret_from_fork+0x3a/0x70 ret_from_fork_asm+0x1b/0x30 </TASK>
The reason for the warning is twofold. One is due to the kthread cpu_map_kthread_run() is stopped prematurely. Another one is __cpu_map_ring_cleanup() doesn't handle skb mode and treats skbs in ptr_ring as XDP frames.
Prematurely-stopped kthread will be fixed by the preceding patch and ptr_ring will be empty when __cpu_map_ring_cleanup() is called. But as the comments in __cpu_map_ring_cleanup() said, handling and freeing skbs in ptr_ring as well to "catch any broken behaviour gracefully".
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-headersUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade kernel-livepatch-5.15.128-80.144Upgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade perfUpgrade perf-debuginfoUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade kernel-tools | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade bpftool-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernelUpgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-libbpfUpgrade kernel-libbpf-staticUpgrade kernel-livepatch-6.1.49-69.116Upgrade python3-perfUpgrade kernel-tools-develUpgrade kernel-tools-debuginfoUpgrade kernel-toolsUpgrade bpftoolUpgrade perfUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-aarch64 | Oct 24, 2025 | Oct 7, 2025 |
| Debian | — | Upgrade linux | Oct 9, 2025 | Oct 9, 2025 |
| Redhat_linux | — | Upgrade kernelUpgrade kernel-rtNo solution exists | Nov 14, 2025 | Oct 7, 2025 |
| Ubuntu | — | Upgrade linux-nvidia-tegra-5.15Upgrade linux-gcp-5.15Upgrade linux-bluefieldUpgrade linux-realtimeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-nvidia-tegraUpgrade linux-azureUpgrade linux-intel-iot-realtimeUpgrade linux-gcpUpgrade linux-awsUpgrade linux-aws-5.15Upgrade linux-hwe-5.15Upgrade linux-riscv-5.15Upgrade linuxUpgrade linux-xilinx-zynqmpUpgrade linux-raspiUpgrade linux-nvidiaUpgrade linux-intel-iotg-5.15Upgrade linux-intel-iotgUpgrade linux-ibm-5.15Upgrade linux-azure-5.15Upgrade linux-lowlatencyUpgrade linux-gkeUpgrade linux-oracleUpgrade linux-gkeopUpgrade linux-ibmUpgrade linux-nvidia-tegra-igxUpgrade linux-kvmUpgrade linux-oracle-5.15 | Oct 10, 2025 | Oct 7, 2025 |
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