{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-49903",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-49903"
  ],
  "published": "2024-10-21T18:02:47Z",
  "summary": "jfs: Fix uaf in dbFreeBits",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: Fix uaf in dbFreeBits\n\n[syzbot reported]\n==================================================================\nBUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:587 [inline]\nBUG: KASAN: slab-use-after-free in __mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752\nRead of size 8 at addr ffff8880229254b0 by task syz-executor357/5216\n\nCPU: 0 UID: 0 PID: 5216 Comm: syz-executor357 Not tainted 6.11.0-rc3-syzkaller-00156-gd7a5aa4b3c00 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:93 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n __mutex_lock_common kernel/locking/mutex.c:587 [inline]\n __mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752\n dbFreeBits+0x7ea/0xd90 fs/jfs/jfs_dmap.c:2390\n dbFreeDmap fs/jfs/jfs_dmap.c:2089 [inline]\n dbFree+0x35b/0x680 fs/jfs/jfs_dmap.c:409\n dbDiscardAG+0x8a9/0xa20 fs/jfs/jfs_dmap.c:1650\n jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:100\n jfs_ioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n\nFreed by task 5218:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579\n poison_slab_object+0xe0/0x150 mm/kasan/common.c:240\n __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256\n kasan_slab_free include/linux/kasan.h:184 [inline]\n slab_free_hook mm/slub.c:2252 [inline]\n slab_free mm/slub.c:4473 [inline]\n kfree+0x149/0x360 mm/slub.c:4594\n dbUnmount+0x11d/0x190 fs/jfs/jfs_dmap.c:278\n jfs_mount_rw+0x4ac/0x6a0 fs/jfs/jfs_mount.c:247\n jfs_remount+0x3d1/0x6b0 fs/jfs/super.c:454\n reconfigure_super+0x445/0x880 fs/super.c:1083\n vfs_cmd_reconfigure fs/fsopen.c:263 [inline]\n vfs_fsconfig_locked fs/fsopen.c:292 [inline]\n __do_sys_fsconfig fs/fsopen.c:473 [inline]\n __se_sys_fsconfig+0xb6e/0xf80 fs/fsopen.c:345\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n[Analysis]\nThere are two paths (dbUnmount and jfs_ioc_trim) that generate race\ncondition when accessing bmap, which leads to the occurrence of uaf.\n\nUse the lock s_umount to synchronize them, in order to avoid uaf caused\nby race condition.",
  "affected": [
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-49903"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4ac58f7734937f3249da734ede946dfb3b1af5e4"
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    },
    {
      "type": "FIX",
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    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}