In the Linux kernel, the following vulnerability has been resolved:
kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case
In __unregister_kprobe_top(), if the currently unregistered probe has post_handler but other child probes of the aggrprobe do not have post_handler, the post_handler of the aggrprobe is cleared. If this is a ftrace-based probe, there is a problem. In later calls to disarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is NULL. But we're armed with kprobe_ipmodify_ops. This triggers a WARN in __disarm_kprobe_ftrace() and may even cause use-after-free:
Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2) WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0 Modules linked in: testKprobe_007(-) CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18 [...] Call Trace: <TASK> __disable_kprobe+0xcd/0xe0 __unregister_kprobe_top+0x12/0x150 ? mutex_lock+0xe/0x30 unregister_kprobes.part.23+0x31/0xa0 unregister_kprobe+0x32/0x40 __x64_sys_delete_module+0x15e/0x260 ? do_user_addr_fault+0x2cd/0x6b0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...]
For the kprobe-on-ftrace case, we keep the post_handler setting to identify this aggrprobe armed with kprobe_ipmodify_ops. This way we can disarm it correctly.
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-tools-debuginfoUpgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade python-perfUpgrade kernel-debuginfoUpgrade kernel-develUpgrade perf-debuginfoUpgrade kernel-toolsUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-livepatch-5.15.86-53.137Upgrade kernel-livepatch-5.10.157-139.675Upgrade python-perf-debuginfoUpgrade kernel-tools-devel | Jun 23, 2025 | May 1, 2025 |
| Debian | — | Upgrade linux | May 5, 2025 | May 1, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade bpftoolUpgrade python3-perfUpgrade kernel | Aug 13, 2025 | Aug 9, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 1, 2025 |
| Ubuntu | — | Upgrade linux-gkeUpgrade linux-awsUpgrade linux-aws-5.4Upgrade linux-intel-iot-realtimeUpgrade linux-oracle-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-gcp-5.4Upgrade linuxUpgrade linux-gcpUpgrade linux-aws-5.15Upgrade linux-ibm-5.4Upgrade linux-azure-fipsUpgrade linux-azure-5.15Upgrade linux-hwe-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-intel-iotgUpgrade linux-raspi-5.4Upgrade linux-gcp-fipsUpgrade linux-gkeopUpgrade linux-hwe-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-raspiUpgrade linux-intel-iotg-5.15Upgrade linux-riscv-5.15Upgrade linux-bluefieldUpgrade linux-aws-fipsUpgrade linux-ibmUpgrade linux-lowlatencyUpgrade linux-kvmUpgrade linux-azureUpgrade linux-gcp-5.15Upgrade linux-iotUpgrade linux-oracleUpgrade linux-fipsUpgrade linux-nvidiaUpgrade linux-azure-5.4Upgrade linux-oracle-5.15Upgrade linux-realtime | May 6, 2025 | May 1, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 1, 2025 |
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