{"id":"CVE-2023-54194","summary":"exfat: use kvmalloc_array/kvfree instead of kmalloc_array/kfree","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: use kvmalloc_array/kvfree instead of kmalloc_array/kfree\n\nThe call stack shown below is a scenario in the Linux 4.19 kernel.\nAllocating memory failed where exfat fs use kmalloc_array due to\nsystem memory fragmentation, while the u-disk was inserted without\nrecognition.\nDevices such as u-disk using the exfat file system are pluggable and\nmay be insert into the system at any time.\nHowever, long-term running systems cannot guarantee the continuity of\nphysical memory. Therefore, it's necessary to address this issue.\n\nBinder:2632_6: page allocation failure: order:4,\n mode:0x6040c0(GFP_KERNEL|__GFP_COMP), nodemask=(null)\nCall trace:\n[242178.097582]  dump_backtrace+0x0/0x4\n[242178.097589]  dump_stack+0xf4/0x134\n[242178.097598]  warn_alloc+0xd8/0x144\n[242178.097603]  __alloc_pages_nodemask+0x1364/0x1384\n[242178.097608]  kmalloc_order+0x2c/0x510\n[242178.097612]  kmalloc_order_trace+0x40/0x16c\n[242178.097618]  __kmalloc+0x360/0x408\n[242178.097624]  load_alloc_bitmap+0x160/0x284\n[242178.097628]  exfat_fill_super+0xa3c/0xe7c\n[242178.097635]  mount_bdev+0x2e8/0x3a0\n[242178.097638]  exfat_fs_mount+0x40/0x50\n[242178.097643]  mount_fs+0x138/0x2e8\n[242178.097649]  vfs_kern_mount+0x90/0x270\n[242178.097655]  do_mount+0x798/0x173c\n[242178.097659]  ksys_mount+0x114/0x1ac\n[242178.097665]  __arm64_sys_mount+0x24/0x34\n[242178.097671]  el0_svc_common+0xb8/0x1b8\n[242178.097676]  el0_svc_handler+0x74/0x90\n[242178.097681]  el0_svc+0x8/0x340\n\nBy analyzing the exfat code,we found that continuous physical memory\nis not required here,so kvmalloc_array is used can solve this problem.","modified":"2026-04-02T09:45:40.368335Z","published":"2025-12-30T12:09:01.436Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0278-1","SUSE-SU-2026:0281-1","SUSE-SU-2026:0293-1","SUSE-SU-2026:0315-1","SUSE-SU-2026:0317-1","SUSE-SU-2026:20477-1","SUSE-SU-2026:20498-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20876-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54194.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c5c3e8a2550b6b2a304b45f260296db9c09df96"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1427a7e96fb90d0896f74f5bcd21feb03cc7c3d0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/79d16a84ea41272dfcb0c00f9798ddd0edd8098d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a34a242cf03211cc89f68308d149b793f63c479"},{"type":"WEB","url":"https://git.kernel.org/stable/c/daf60d6cca26e50d65dac374db92e58de745ad26"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54194.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54194"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1e49a94cf707204b66a3fb242f2814712c941f52"},{"fixed":"79d16a84ea41272dfcb0c00f9798ddd0edd8098d"},{"fixed":"8a34a242cf03211cc89f68308d149b793f63c479"},{"fixed":"1427a7e96fb90d0896f74f5bcd21feb03cc7c3d0"},{"fixed":"0c5c3e8a2550b6b2a304b45f260296db9c09df96"},{"fixed":"daf60d6cca26e50d65dac374db92e58de745ad26"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54194.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.7.0"},{"fixed":"5.10.190"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.126"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.4.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54194.json"}}],"schema_version":"1.7.5"}