In the Linux kernel, the following vulnerability has been resolved:
bpf: cpumap: Fix memory leak in cpu_map_update_elem
Syzkaller reported a memory leak as follows:
BUG: memory leak unreferenced object 0xff110001198ef748 (size 192): comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s) hex dump (first 32 bytes): 00 00 00 00 4a 19 00 00 80 ad e3 e4 fe ff c0 00 ....J........... 00 b2 d3 0c 01 00 11 ff 28 f5 8e 19 01 00 11 ff ........(....... backtrace: [<ffffffffadd28087>] __cpu_map_entry_alloc+0xf7/0xb00 [<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0 [<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520 [<ffffffffadc7349b>] map_update_elem+0x4cb/0x720 [<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90 [<ffffffffb029cc80>] do_syscall_64+0x30/0x40 [<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6
BUG: memory leak unreferenced object 0xff110001198ef528 (size 192): comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffffadd281f0>] __cpu_map_entry_alloc+0x260/0xb00 [<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0 [<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520 [<ffffffffadc7349b>] map_update_elem+0x4cb/0x720 [<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90 [<ffffffffb029cc80>] do_syscall_64+0x30/0x40 [<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6
BUG: memory leak unreferenced object 0xff1100010fd93d68 (size 8): comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s) hex dump (first 8 bytes): 00 00 00 00 00 00 00 00 ........ backtrace: [<ffffffffade5db3e>] kvmalloc_node+0x11e/0x170 [<ffffffffadd28280>] __cpu_map_entry_alloc+0x2f0/0xb00 [<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0 [<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520 [<ffffffffadc7349b>] map_update_elem+0x4cb/0x720 [<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90 [<ffffffffb029cc80>] do_syscall_64+0x30/0x40 [<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6
In the cpu_map_update_elem flow, when kthread_stop is called before calling the threadfn of rcpu->kthread, since the KTHREAD_SHOULD_STOP bit of kthread has been set by kthread_stop, the threadfn of rcpu->kthread will never be executed, and rcpu->refcnt will never be 0, which will lead to the allocated rcpu, rcpu->queue and rcpu->queue->queue cannot be released.
Calling kthread_stop before executing kthread's threadfn will return -EINTR. We can complete the release of memory resources in this state.
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-livepatch-5.15.122-77.145Upgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade python-perfUpgrade kernel-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade perfUpgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade kernel | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-libbpf-develUpgrade kernel-libbpf-staticUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade python3-perf-debuginfoUpgrade bpftoolUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade kernel-livepatch-6.1.41-63.109Upgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade bpftool-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade python3-perfUpgrade perfUpgrade kernel-libbpfUpgrade kernel-debuginfo-common-aarch64 | Oct 16, 2025 | Sep 18, 2025 |
| Debian | — | Upgrade linux | Sep 22, 2025 | Sep 22, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-tools | Dec 12, 2025 | Dec 11, 2025 |
| Redhat_linux | — | Upgrade kernel-rtUpgrade kernelNo solution exists | Nov 14, 2025 | Sep 18, 2025 |
| Ubuntu | — | Upgrade linux-riscv-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-ibm-5.15Upgrade linux-realtimeUpgrade linux-aws-5.15Upgrade linuxUpgrade linux-bluefieldUpgrade linux-lowlatencyUpgrade linux-nvidia-tegraUpgrade linux-nvidia-tegra-5.15Upgrade linux-awsUpgrade linux-raspiUpgrade linux-gkeUpgrade linux-oracle-5.15Upgrade linux-azure-fdeUpgrade linux-azure-5.15Upgrade linux-gcpUpgrade linux-ibmUpgrade linux-intel-iotgUpgrade linux-oracleUpgrade linux-nvidia-tegra-igxUpgrade linux-intel-iotg-5.15Upgrade linux-hwe-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-kvmUpgrade linux-gkeopUpgrade linux-nvidiaUpgrade linux-gcp-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-azure | Sep 26, 2025 | Sep 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Sep 18, 2025 |
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