In the Linux kernel, the following vulnerability has been resolved:
exfat: use kvmalloc_array/kvfree instead of kmalloc_array/kfree
The call stack shown below is a scenario in the Linux 4.19 kernel. Allocating memory failed where exfat fs use kmalloc_array due to system memory fragmentation, while the u-disk was inserted without recognition. Devices such as u-disk using the exfat file system are pluggable and may be insert into the system at any time. However, long-term running systems cannot guarantee the continuity of physical memory. Therefore, it's necessary to address this issue.
Binder:2632_6: page allocation failure: order:4, mode:0x6040c0(GFP_KERNEL|__GFP_COMP), nodemask=(null) Call trace: [242178.097582] dump_backtrace+0x0/0x4 [242178.097589] dump_stack+0xf4/0x134 [242178.097598] warn_alloc+0xd8/0x144 [242178.097603] __alloc_pages_nodemask+0x1364/0x1384 [242178.097608] kmalloc_order+0x2c/0x510 [242178.097612] kmalloc_order_trace+0x40/0x16c [242178.097618] __kmalloc+0x360/0x408 [242178.097624] load_alloc_bitmap+0x160/0x284 [242178.097628] exfat_fill_super+0xa3c/0xe7c [242178.097635] mount_bdev+0x2e8/0x3a0 [242178.097638] exfat_fs_mount+0x40/0x50 [242178.097643] mount_fs+0x138/0x2e8 [242178.097649] vfs_kern_mount+0x90/0x270 [242178.097655] do_mount+0x798/0x173c [242178.097659] ksys_mount+0x114/0x1ac [242178.097665] __arm64_sys_mount+0x24/0x34 [242178.097671] el0_svc_common+0xb8/0x1b8 [242178.097676] el0_svc_handler+0x74/0x90 [242178.097681] el0_svc+0x8/0x340
By analyzing the exfat code,we found that continuous physical memory is not required here,so kvmalloc_array is used can solve this problem.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-headersUpgrade kernel-toolsUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.128-80.144Upgrade kernel-livepatch-5.10.192-182.736Upgrade perfUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-devel | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade python3-perfUpgrade kernel-libbpf-develUpgrade kernel-libbpf-staticUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernelUpgrade perfUpgrade kernel-toolsUpgrade kernel-livepatch-6.1.49-69.116Upgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade bpftool-debuginfoUpgrade kernel-libbpfUpgrade python3-perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfo | Feb 20, 2026 | Dec 30, 2025 |
| Debian | — | Upgrade linux | Dec 31, 2025 | Dec 31, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernelUpgrade python3-perfUpgrade kernel-tools-libsUpgrade bpftool | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 30, 2025 |
| Ubuntu | — | Upgrade linux-nvidia-tegra-igxUpgrade linux-intel-iot-realtimeUpgrade linux-awsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-realtimeUpgrade linux-intel-iotg-5.15Upgrade linux-bluefieldUpgrade linux-gcpUpgrade linux-riscv-5.15Upgrade linux-kvmUpgrade linux-azure-fde-5.15Upgrade linux-lowlatencyUpgrade linux-nvidiaUpgrade linux-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-ibm-5.15Upgrade linux-gkeUpgrade linux-nvidia-tegraUpgrade linux-xilinx-zynqmpUpgrade linux-aws-5.15Upgrade linux-oracleUpgrade linux-raspiUpgrade linux-gkeopUpgrade linux-ibmUpgrade linux-azure-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-oracle-5.15Upgrade linux-azureUpgrade linux-azure-fdeUpgrade linux | Jan 6, 2026 | Jan 2, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 30, 2025 |
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