{"id":"CVE-2022-49560","summary":"exfat: check if cluster num is valid","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: check if cluster num is valid\n\nSyzbot reported slab-out-of-bounds read in exfat_clear_bitmap.\nThis was triggered by reproducer calling truncute with size 0,\nwhich causes the following trace:\n\nBUG: KASAN: slab-out-of-bounds in exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174\nRead of size 8 at addr ffff888115aa9508 by task syz-executor251/365\n\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118\n print_address_description+0x81/0x3c0 mm/kasan/report.c:233\n __kasan_report mm/kasan/report.c:419 [inline]\n kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436\n __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309\n exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174\n exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181\n __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217\n exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243\n exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339\n notify_change+0xb76/0xe10 fs/attr.c:336\n do_truncate+0x1ea/0x2d0 fs/open.c:65\n\nMove the is_valid_cluster() helper from fatent.c to a common\nheader to make it reusable in other *.c files. And add is_valid_cluster()\nto validate if cluster number is within valid range in exfat_clear_bitmap()\nand exfat_set_bitmap().","modified":"2026-04-02T08:27:42.832283Z","published":"2025-02-26T02:14:05.548Z","related":["SUSE-SU-2025:1176-1","SUSE-SU-2025:1241-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49560.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2193286402df2d9c53294f7a858d5e6fd7346e08"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c58b14b6f9cde9f69e7fa053ab73f6e013a7131"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82f723b8a5adf497f9e34c702a30ca7298615654"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c504167adc3248095a905fa0700a9693897cb5ed"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49560.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49560"},{"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":"82f723b8a5adf497f9e34c702a30ca7298615654"},{"fixed":"c504167adc3248095a905fa0700a9693897cb5ed"},{"fixed":"7c58b14b6f9cde9f69e7fa053ab73f6e013a7131"},{"fixed":"2193286402df2d9c53294f7a858d5e6fd7346e08"},{"fixed":"64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49560.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}