{"id":"DEBIAN-CVE-2022-49560","details":"In the Linux kernel, the following vulnerability has been resolved:  exfat: check if cluster num is valid  Syzbot reported slab-out-of-bounds read in exfat_clear_bitmap. This was triggered by reproducer calling truncute with size 0, which causes the following trace:  BUG: KASAN: slab-out-of-bounds in exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 Read of size 8 at addr ffff888115aa9508 by task syz-executor251/365  Call Trace:  __dump_stack lib/dump_stack.c:77 [inline]  dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118  print_address_description+0x81/0x3c0 mm/kasan/report.c:233  __kasan_report mm/kasan/report.c:419 [inline]  kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309  exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174  exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181  __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217  exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243  exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339  notify_change+0xb76/0xe10 fs/attr.c:336  do_truncate+0x1ea/0x2d0 fs/open.c:65  Move the is_valid_cluster() helper from fatent.c to a common header to make it reusable in other *.c files. And add is_valid_cluster() to validate if cluster number is within valid range in exfat_clear_bitmap() and exfat_set_bitmap().","modified":"2026-09-01T16:05:32.648052195Z","published":"2025-02-26T07:01:31.780Z","upstream":["CVE-2022-49560"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49560"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49560.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49560.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49560.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}