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In the Linux kernel, the following vulnerability has been resolved:
loop: Fix use-after-free issues
do_req_filebacked() calls blk_mq_complete_request() synchronously or asynchronously when using asynchronous I/O unless memory allocation fails. Hence, modify loop_handle_cmd() such that it does not dereference 'cmd' nor 'rq' after do_req_filebacked() finished unless we are sure that the request has not yet been completed. This patch fixes the following kernel crash:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000054 Call trace: css_put.42938+0x1c/0x1ac loop_process_work+0xc8c/0xfd4 loop_rootcg_workfn+0x24/0x34 process_one_work+0x244/0x558 worker_thread+0x400/0x8fc kthread+0x16c/0x1e0 ret_from_fork+0x10/0x20
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade kernel-livepatch-5.15.104-63.140Upgrade perfUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernel-headersUpgrade kernel-devel | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-libbpf-staticUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-toolsUpgrade kernel-headersUpgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-debuginfoUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-livepatch-6.1.21-1.45Upgrade kernel-libbpf-develUpgrade kernel-libbpfUpgrade kernelUpgrade python3-perfUpgrade perfUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-debuginfo | Aug 5, 2025 | May 2, 2025 |
| Debian | — | Upgrade linux | May 5, 2025 | May 2, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 2, 2025 |
| Ubuntu | — | Upgrade linux-azureUpgrade linux-kvmUpgrade linux-xilinx-zynqmpUpgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linux-azure-fdeUpgrade linux-raspiUpgrade linux-nvidiaUpgrade linux-oracleUpgrade linux-azure-5.15Upgrade linux-gkeopUpgrade linux-realtimeUpgrade linux-gcp-5.15Upgrade linux-ibmUpgrade linux-hwe-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-riscv-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-ibm-5.15Upgrade linux-intel-iotgUpgrade linux-gkeUpgrade linux-aws-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-gcpUpgrade linux-nvidia-tegraUpgrade linux-bluefieldUpgrade linux-nvidia-tegra-igxUpgrade linux-lowlatencyUpgrade linux-oracle-5.15Upgrade linux | May 8, 2025 | May 2, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 2, 2025 |
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