In the Linux kernel, the following vulnerability has been resolved:
kernfs: Relax constraint in draining guard
The active reference lifecycle provides the break/unbreak mechanism but the active reference is not truly active after unbreak -- callers don't use it afterwards but it's important for proper pairing of kn->active counting. Assuming this mechanism is in place, the WARN check in kernfs_should_drain_open_files() is too sensitive -- it may transiently catch those (rightful) callers between kernfs_unbreak_active_protection() and kernfs_put_active() as found out by Chen Ridong:
kernfs_remove_by_name_ns kernfs_get_active // active=1 __kernfs_remove // active=0x80000002 kernfs_drain ... wait_event //waiting (active == 0x80000001) kernfs_break_active_protection // active = 0x80000001 // continue kernfs_unbreak_active_protection // active = 0x80000002 ... kernfs_should_drain_open_files // warning occurs kernfs_put_active
To avoid the false positives (mind panic_on_warn) remove the check altogether. (This is meant as quick fix, I think active reference break/unbreak may be simplified with larger rework.)
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_2023 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-develUpgrade python3-perf6.12-debuginfoUpgrade python3-perfUpgrade kernel-libbpf-staticUpgrade kernel-libbpf-develUpgrade kernel-modules-extra-commonUpgrade kernelUpgrade kernel6.12-debuginfoUpgrade kernel-livepatch-6.12.35-55.103Upgrade python3-perf-debuginfoUpgrade kernel-develUpgrade perf6.12-debuginfoUpgrade bpftoolUpgrade kernel-modules-extraUpgrade kernel-tools-debuginfoUpgrade kernel-headersUpgrade perf-debuginfoUpgrade bpftool-debuginfoUpgrade perf6.12Upgrade python3-perf6.12Upgrade kernel-livepatch-6.1.144-170.251Upgrade perfUpgrade kernel-toolsUpgrade kernel6.12Upgrade kernel-libbpfUpgrade kernel-libbpf-debuginfoUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade kernel6.12-modules-extraUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel-debuginfo-common-aarch64 | Sep 9, 2025 | Jul 10, 2025 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jul 11, 2025 | Jul 11, 2025 |
| Redhat_linux | — | No solution exists | Jul 14, 2025 | Jul 10, 2025 |
| Ubuntu | — | Upgrade linux-image-gkeop-6.8Upgrade linux-image-oem-24.04aUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-6.8.1-1041-realtimeUpgrade linux-image-gke-6.8Upgrade linux-image-aws-64k-6.8Upgrade linux-image-oem-22.04Upgrade linux-image-gcpUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-ibm-classicUpgrade linux-image-lowlatencyUpgrade linux-image-generic-64k-6.8Upgrade linux-image-gcp-6.14Upgrade linux-image-6.14.0-32-generic-64kUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-6.8.0-100-genericUpgrade linux-image-oem-22.04aUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-6.14.0-1012-oemUpgrade linux-image-6.8.0-1046-awsUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-virtual-6.8Upgrade linux-image-gcp-64k-6.14Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-ibm-6.8Upgrade linux-image-intel-iotgUpgrade linux-image-raspi-6.14Upgrade linux-image-azureUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-realtime-hwe-24.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-raspi-realtimeUpgrade linux-image-aws-6.8Upgrade linux-image-lowlatency-6.8Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-gcp-fipsUpgrade linux-image-azure-6.14Upgrade linux-image-6.8.0-1043-oracleUpgrade linux-image-gkeopUpgrade linux-image-azure-fips-6.8Upgrade linux-image-genericUpgrade linux-image-oracle-64k-6.14Upgrade linux-image-6.8.0-1046-aws-64kUpgrade linux-image-raspiUpgrade linux-image-6.8.0-100-lowlatencyUpgrade linux-image-6.8.0-100-lowlatency-64kUpgrade linux-image-6.8.0-1043-gkeUpgrade linux-image-lowlatency-64kUpgrade linux-image-fipsUpgrade linux-image-6.14.0-1013-aws-64kUpgrade linux-image-6.8.0-1046-azureUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-xilinxUpgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1046-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1047-gcp-fipsUpgrade linux-image-generic-6.8Upgrade linux-image-aws-fipsUpgrade linux-image-gke-64kUpgrade linux-image-6.14.0-1016-gcpUpgrade linux-image-generic-6.14Upgrade linux-image-azure-lts-24.04Upgrade linux-image-realtime-6.8.1Upgrade linux-image-6.14.0-1016-gcp-64kUpgrade linux-image-generic-64kUpgrade linux-image-ibmUpgrade linux-image-generic-lpaeUpgrade linux-image-oem-22.04cUpgrade linux-image-6.8.0-1023-xilinxUpgrade linux-image-fips-6.8Upgrade linux-image-virtualUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.8.0-1030-gkeopUpgrade linux-image-virtual-6.14Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-gke-64k-6.8Upgrade linux-image-gkeUpgrade linux-image-aws-64kUpgrade linux-image-6.14.0-32-genericUpgrade linux-image-6.14.0-1012-azureUpgrade linux-image-realtime-6.14Upgrade linux-image-gcp-64kUpgrade linux-image-6.8.0-1047-gcp-64kUpgrade linux-image-6.8.0-1047-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-1046-aws-fipsUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-2037-raspi-realtimeUpgrade linux-image-6.14.0-1012-realtimeUpgrade linux-image-6.8.0-100-generic-64kUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-aws-6.14Upgrade linux-image-6.8.0-1044-ibmUpgrade linux-image-6.14.0-1013-oracleUpgrade linux-image-oem-6.14Upgrade linux-image-oem-24.04cUpgrade linux-image-6.14.0-1013-oracle-64kUpgrade linux-image-oracle-6.14Upgrade linux-image-nvidia-6.8Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-generic-64k-6.14Upgrade linux-image-awsUpgrade linux-image-6.8.0-1046-nvidia-64kUpgrade linux-image-6.14.0-1014-raspiUpgrade linux-image-6.14.0-1013-awsUpgrade linux-image-azure-fipsUpgrade linux-image-6.8.0-100-fipsUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-raspi-6.8Upgrade linux-image-oracle-6.8Upgrade linux-image-oem-24.04bUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-gcp-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.0-1046-nvidia-lowlatencyUpgrade linux-image-6.8.0-1046-azure-fipsUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-oem-24.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-realtimeUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-aws-fips-6.8Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-oem-22.04bUpgrade linux-image-oem-22.04dUpgrade linux-image-aws-64k-6.14Upgrade linux-image-kvmUpgrade linux-image-6.8.0-1043-oracle-64kUpgrade linux-image-oracleUpgrade linux-image-6.8.0-1047-raspiUpgrade linux-image-xilinx-6.8Upgrade linux-image-6.8.0-1046-nvidiaUpgrade linux-image-6.8.0-1043-gke-64k | Jul 14, 2025 | Jul 10, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 10, 2025 | Jul 10, 2025 |
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