In the Linux kernel, the following vulnerability has been resolved:
xen-netfront: Fix NULL sring after live migration
A NAPI is setup for each network sring to poll data to kernel The sring with source host is destroyed before live migration and new sring with target host is setup after live migration. The NAPI for the old sring is not deleted until setup new sring with target host after migration. With busy_poll/busy_read enabled, the NAPI can be polled before got deleted when resume VM.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 IP: xennet_poll+0xae/0xd20 PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI Call Trace: finish_task_switch+0x71/0x230 timerqueue_del+0x1d/0x40 hrtimer_try_to_cancel+0xb5/0x110 xennet_alloc_rx_buffers+0x2a0/0x2a0 napi_busy_loop+0xdb/0x270 sock_poll+0x87/0x90 do_sys_poll+0x26f/0x580 tracing_map_insert+0x1d4/0x2f0 event_hist_trigger+0x14a/0x260
finish_task_switch+0x71/0x230 __schedule+0x256/0x890 recalc_sigpending+0x1b/0x50 xen_sched_clock+0x15/0x20 __rb_reserve_next+0x12d/0x140 ring_buffer_lock_reserve+0x123/0x3d0 event_triggers_call+0x87/0xb0 trace_event_buffer_commit+0x1c4/0x210 xen_clocksource_get_cycles+0x15/0x20 ktime_get_ts64+0x51/0xf0 SyS_ppoll+0x160/0x1a0 SyS_ppoll+0x160/0x1a0 do_syscall_64+0x73/0x130 entry_SYSCALL_64_after_hwframe+0x41/0xa6 ... RIP: xennet_poll+0xae/0xd20 RSP: ffffb4f041933900 CR2: 0000000000000008 ---[ end trace f8601785b354351c ]---
xen frontend should remove the NAPIs for the old srings before live migration as the bond srings are destroyed
There is a tiny window between the srings are set to NULL and the NAPIs are disabled, It is safe as the NAPI threads are still frozen at that time
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfoUpgrade kernel-livepatch-5.15.86-53.137Upgrade python-perf-debuginfoUpgrade perfUpgrade perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-headersUpgrade bpftoolUpgrade python-perfUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.10.162-141.675Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfo-common-aarch64Upgrade kernelUpgrade kernel-toolsUpgrade bpftool-debuginfo | Mar 14, 2025 | Oct 21, 2024 |
| Debian | — | Upgrade linux | Oct 23, 2024 | Oct 23, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernelUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel-tools | Jan 14, 2025 | Oct 21, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernel-tools-libsUpgrade kernelUpgrade python3-perfUpgrade kernel-tools | Jan 15, 2025 | Oct 21, 2024 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | May 15, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-azure-5.4Upgrade linux-azure-fde-5.15Upgrade linux-raspiUpgrade linux-iotUpgrade linux-gkeopUpgrade linux-hwe-5.15Upgrade linux-azureUpgrade linux-lowlatencyUpgrade linux-nvidia-tegra-5.15Upgrade linux-gcp-5.4Upgrade linux-awsUpgrade linux-ibm-5.4Upgrade linux-gkeop-5.15Upgrade linux-azure-fipsUpgrade linux-aws-5.15Upgrade linuxUpgrade linux-aws-5.4Upgrade linux-oracle-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-riscv-5.15Upgrade linux-raspi-5.4Upgrade linux-azure-5.15Upgrade linux-ibmUpgrade linux-gcpUpgrade linux-bluefieldUpgrade linux-intel-iotgUpgrade linux-intel-iotg-5.15Upgrade linux-azure-fdeUpgrade linux-aws-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-kvmUpgrade linux-realtimeUpgrade linux-nvidiaUpgrade linux-oracle-5.4Upgrade linux-oracleUpgrade linux-gcp-fipsUpgrade linux-fipsUpgrade linux-gcp-5.15Upgrade linux-gkeUpgrade linux-hwe-5.4 | Nov 19, 2024 | Oct 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Oct 21, 2024 |
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