Description
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 status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 79d16a84ea41272dfcb0c00f9798ddd0edd8098d
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 8a34a242cf03211cc89f68308d149b793f63c479
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 1427a7e96fb90d0896f74f5bcd21feb03cc7c3d0
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 0c5c3e8a2550b6b2a304b45f260296db9c09df96
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before daf60d6cca26e50d65dac374db92e58de745ad26
5.10.190 (semver)
5.15.126 (semver)
6.1.45 (semver)
6.4.10 (semver)
6.5 (original_commit_for_fix)
References
git.kernel.org/...c/79d16a84ea41272dfcb0c00f9798ddd0edd8098d
git.kernel.org/...c/8a34a242cf03211cc89f68308d149b793f63c479
git.kernel.org/...c/1427a7e96fb90d0896f74f5bcd21feb03cc7c3d0
git.kernel.org/...c/0c5c3e8a2550b6b2a304b45f260296db9c09df96
git.kernel.org/...c/daf60d6cca26e50d65dac374db92e58de745ad26
Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.
