In the Linux kernel, the following vulnerability has been resolved:
bpf: use kvfree() for replaced sysctl write buffer
proc_sys_call_handler() allocates its temporary sysctl buffer with kvzalloc() and passes it to __cgroup_bpf_run_filter_sysctl(). Since kvzalloc() may fall back to vmalloc() for large allocations, freeing that buffer with kfree() is wrong and can corrupt memory.
Use kvfree() to safely handle both kmalloc and kvzalloc()/vmalloc allocations.
The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1-rc5.
Reproduced the bug based on v7.1-rc4 in a QEMU x86_64 guest booted with KASAN and CONFIG_FAILSLAB enabled. To exercise the replacement path, the test tree also included the accompanying fix for the stale ret == 1 check in __cgroup_bpf_run_filter_sysctl(). The reproducer confines failslab injections to the proc_sys_call_handler() range, uses stacktrace-depth=32, and injects fail-nth=1 while writing 8191 bytes to /proc/sys/kernel/domainname from a task in the target cgroup. Under that setup, fail-nth=1 triggered the fault:
BUG: unable to handle page fault for address: ffffeb0200024d48 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 SMP KASAN NOPTI CPU: 2 UID: 0 PID: 209 Comm: repro_proc_sys_ Not tainted 7.1.0-rc4-00686-g97625979a5d4 PREEMPT(lazy) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 RIP: 0010:kfree+0x6e/0x510 ... Call Trace: <TASK> ? __cgroup_bpf_run_filter_sysctl+0x626/0xc30 __cgroup_bpf_run_filter_sysctl+0x74d/0xc30 ? __pfx___cgroup_bpf_run_filter_sysctl+0x10/0x10 ? srso_return_thunk+0x5/0x5f ? __kvmalloc_node_noprof+0x345/0x870 ? proc_sys_call_handler+0x250/0x480 ? srso_return_thunk+0x5/0x5f proc_sys_call_handler+0x3a2/0x480 ? __pfx_proc_sys_call_handler+0x10/0x10 ? srso_return_thunk+0x5/0x5f ? selinux_file_permission+0x39f/0x500 ? srso_return_thunk+0x5/0x5f ? lock_is_held_type+0x9e/0x120 vfs_write+0x98e/0x1000 ... </TASK>
With this fix applied on top of the same test setup, rerunning the reproducer with fail-nth=1 yields no corresponding Oops reports.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-livepatch-5.10.260-259.1053Upgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.15.211-149.249Upgrade perfUpgrade kernel-headersUpgrade kernel-toolsUpgrade kernel-develUpgrade kernel-tools-develUpgrade python-perf-debuginfoUpgrade perf-debuginfo | Aug 2, 2026 | Aug 2, 2026 |
| Amazon_linux_2023 | — | Upgrade python3-perf6.18Upgrade kernel6.12-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64Upgrade microvm-kernel6.18Upgrade kernel6.12-tools-develUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-toolsUpgrade perf6.18Upgrade kernel6.12-headersUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.18-develUpgrade kernel6.18-tools-debuginfoUpgrade kernel-livepatch-6.18.38-73.137Upgrade bpftool6.18Upgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-tools-develUpgrade python3-perf6.18-debuginfoUpgrade perf6.12Upgrade perf6.18-debuginfoUpgrade kernel6.18-headersUpgrade kernel6.18-debuginfo-common-aarch64Upgrade bpftool6.12-debuginfoUpgrade kernel-livepatch-6.12.95-124.187Upgrade kernel6.18Upgrade bpftool6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.18-modules-extraUpgrade kernel6.12-modules-extra-commonUpgrade python3-perf6.12Upgrade perf6.12-debuginfoUpgrade kernel6.12-develUpgrade kernel6.12-modules-extraUpgrade kernel6.12Upgrade kernel6.18-debuginfoUpgrade kernel6.18-toolsUpgrade bpftool6.18-debuginfo | Aug 10, 2026 | Jul 19, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jul 20, 2026 | Jul 20, 2026 |
| Redhat_linux | — | No solution exists | Jul 22, 2026 | Jul 19, 2026 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1071-azureUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-gcp-7.0Upgrade linux-image-aws-6.8Upgrade linux-image-ibm-classicUpgrade linux-image-lowlatencyUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-5.15.0-1109-intel-iot-realtimeUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-gcpUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-ibm-7.0Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-generic-6.8Upgrade linux-image-azure-fipsUpgrade linux-image-azure-cvmUpgrade linux-image-nvidia-7.0Upgrade linux-image-azure-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-kvmUpgrade linux-image-gke-64k-7.0Upgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-6.8.0-1067-awsUpgrade linux-image-raspiUpgrade linux-image-5.15.0-195-lowlatency-64kUpgrade linux-image-6.8.0-1067-aws-64kUpgrade linux-image-5.15.0-198-fipsUpgrade linux-image-oem-20.04bUpgrade linux-image-oem-26.04bUpgrade linux-image-gke-5.15Upgrade linux-image-oracle-64kUpgrade linux-image-fips-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-aws-64k-5.15Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-realtime-5.15Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1064-oracleUpgrade linux-image-gcp-5.15Upgrade linux-image-gke-64kUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1071-azure-fipsUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-virtual-6.8Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-aws-fips-6.8Upgrade linux-image-aws-64k-6.8Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-aws-lts-24.04Upgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-5.15.0-1117-aws-fipsUpgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-ibmUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oracle-7.0Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-5.15.0-1123-azure-fipsUpgrade linux-image-6.8.0-1064-oracle-64kUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-5.15.0-1113-gkeUpgrade linux-image-ibm-6.8Upgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-oem-7.0Upgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-raspi-realtimeUpgrade linux-image-awsUpgrade linux-image-gcp-fipsUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-5.15.0-1118-gcpUpgrade linux-image-azure-lts-24.04Upgrade linux-image-5.15.0-1112-intel-iotgUpgrade linux-image-aws-lts-22.04Upgrade linux-image-6.8.0-147-fipsUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-azureUpgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-azure-fips-6.8Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-6.8.0-1066-gke-64kUpgrade linux-image-6.8.1-1062-realtimeUpgrade linux-image-azure-lts-26.04Upgrade linux-image-azure-fdeUpgrade linux-image-gkeop-6.8Upgrade linux-image-fips-5.15Upgrade linux-image-oem-20.04dUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-oracle-5.15Upgrade linux-image-virtualUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-genericUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-realtime-64kUpgrade linux-image-realtimeUpgrade linux-image-oracleUpgrade linux-image-gcp-64kUpgrade linux-image-gcp-6.8Upgrade linux-image-azure-lts-22.04Upgrade linux-image-nvidiaUpgrade linux-image-generic-lpae-5.15Upgrade linux-image-5.15.0-1117-aws-64kUpgrade linux-image-lowlatency-6.8Upgrade linux-image-laptop-23.10Upgrade linux-image-intel-iotg-5.15Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-1067-ibmUpgrade linux-image-6.8.0-1036-nvidia-tegraUpgrade linux-image-5.15.0-198-generic-64kUpgrade linux-image-5.15.0-1112-nvidiaUpgrade linux-image-raspi-7.0Upgrade linux-image-oracle-6.8Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-kvm-5.15Upgrade linux-image-aws-5.15Upgrade linux-image-intelUpgrade linux-image-azure-fde-6.8Upgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-oem-20.04Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-lowlatency-5.15Upgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-6.8.0-147-lowlatency-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oem-20.04cUpgrade linux-image-generic-64k-5.15Upgrade linux-image-oracle-lts-22.04Upgrade linux-image-5.15.0-1114-oracleUpgrade linux-image-7.0.0-1013-oemUpgrade linux-image-6.8.0-1036-nvidia-tegra-rtUpgrade linux-image-5.15.0-198-generic-lpaeUpgrade linux-image-5.15.0-195-lowlatencyUpgrade linux-image-virtual-5.15Upgrade linux-image-realtime-6.8.1Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-intel-iotgUpgrade linux-image-gkeopUpgrade linux-image-gkeUpgrade linux-image-generic-64kUpgrade linux-image-generic-5.15Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-6.8.0-1071-gcpUpgrade linux-image-5.15.0-1123-azureUpgrade linux-image-5.15.0-1080-xilinx-zynqmpUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-generic-64k-7.0Upgrade linux-image-gcp-lts-22.04Upgrade linux-image-azure-6.8Upgrade linux-image-7.0.0-1012-awsUpgrade linux-image-5.15.0-1100-gkeopUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-realtime-7.0Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-nvidia-5.15Upgrade linux-image-6.8.0-1071-gcp-64kUpgrade linux-image-virtual-7.0Upgrade linux-image-oem-26.04aUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-azure-5.15Upgrade linux-image-azure-fde-5.15Upgrade linux-image-generic-7.0Upgrade linux-image-6.8.0-147-genericUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-gcp-fips-5.15Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-azure-fips-5.15Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-gke-6.8Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-6.8.0-1071-gcp-fipsUpgrade linux-image-6.8.0-1052-gkeopUpgrade linux-image-5.15.0-198-genericUpgrade linux-image-5.15.0-1111-ibmUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-nvidia-tegraUpgrade linux-image-nvidia-bosUpgrade linux-image-ibm-5.15Upgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-aws-64k-7.0Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-generic-lpaeUpgrade linux-image-fipsUpgrade linux-image-aws-fips-5.15Upgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-1067-aws-fipsUpgrade linux-image-5.15.0-1116-realtimeUpgrade linux-image-5.15.0-1112-nvidia-lowlatencyUpgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gkeop-5.15Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-gke-7.0Upgrade linux-image-gke-64k-6.8Upgrade linux-image-6.8.0-147-generic-64kUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-aws-64kUpgrade linux-image-6.8.0-147-lowlatencyUpgrade linux-image-6.8.0-1069-azure-fdeUpgrade linux-image-6.8.0-1066-gkeUpgrade linux-image-5.15.0-1122-azure-fdeUpgrade linux-image-5.15.0-1118-gcp-fipsUpgrade linux-image-5.15.0-1117-awsUpgrade linux-image-5.15.0-1109-kvm | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 27, 2026 | Jul 19, 2026 |
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