{"id":"DEBIAN-CVE-2024-49903","details":"In the Linux kernel, the following vulnerability has been resolved:  jfs: Fix uaf in dbFreeBits  [syzbot reported] ================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:587 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752 Read of size 8 at addr ffff8880229254b0 by task syz-executor357/5216  CPU: 0 UID: 0 PID: 5216 Comm: syz-executor357 Not tainted 6.11.0-rc3-syzkaller-00156-gd7a5aa4b3c00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace:  \u003cTASK\u003e  __dump_stack lib/dump_stack.c:93 [inline]  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119  print_address_description mm/kasan/report.c:377 [inline]  print_report+0x169/0x550 mm/kasan/report.c:488  kasan_report+0x143/0x180 mm/kasan/report.c:601  __mutex_lock_common kernel/locking/mutex.c:587 [inline]  __mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752  dbFreeBits+0x7ea/0xd90 fs/jfs/jfs_dmap.c:2390  dbFreeDmap fs/jfs/jfs_dmap.c:2089 [inline]  dbFree+0x35b/0x680 fs/jfs/jfs_dmap.c:409  dbDiscardAG+0x8a9/0xa20 fs/jfs/jfs_dmap.c:1650  jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:100  jfs_ioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131  vfs_ioctl fs/ioctl.c:51 [inline]  __do_sys_ioctl fs/ioctl.c:907 [inline]  __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893  do_syscall_x64 arch/x86/entry/common.c:52 [inline]  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83  Freed by task 5218:  kasan_save_stack mm/kasan/common.c:47 [inline]  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68  kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579  poison_slab_object+0xe0/0x150 mm/kasan/common.c:240  __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256  kasan_slab_free include/linux/kasan.h:184 [inline]  slab_free_hook mm/slub.c:2252 [inline]  slab_free mm/slub.c:4473 [inline]  kfree+0x149/0x360 mm/slub.c:4594  dbUnmount+0x11d/0x190 fs/jfs/jfs_dmap.c:278  jfs_mount_rw+0x4ac/0x6a0 fs/jfs/jfs_mount.c:247  jfs_remount+0x3d1/0x6b0 fs/jfs/super.c:454  reconfigure_super+0x445/0x880 fs/super.c:1083  vfs_cmd_reconfigure fs/fsopen.c:263 [inline]  vfs_fsconfig_locked fs/fsopen.c:292 [inline]  __do_sys_fsconfig fs/fsopen.c:473 [inline]  __se_sys_fsconfig+0xb6e/0xf80 fs/fsopen.c:345  do_syscall_x64 arch/x86/entry/common.c:52 [inline]  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83  entry_SYSCALL_64_after_hwframe+0x77/0x7f  [Analysis] There are two paths (dbUnmount and jfs_ioc_trim) that generate race condition when accessing bmap, which leads to the occurrence of uaf.  Use the lock s_umount to synchronize them, in order to avoid uaf caused by race condition.","modified":"2026-09-15T09:02:58.826715658Z","published":"2024-10-21T18:15:12.873Z","upstream":["CVE-2024-49903"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-49903"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.115-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-49903.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-49903.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-49903.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}