{
  "public_date" : "2025-04-16T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: f2fs: fix to avoid accessing uninitialized curseg",
    "id" : "2360272",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2360272"
  },
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nf2fs: fix to avoid accessing uninitialized curseg\nsyzbot reports a f2fs bug as below:\nF2FS-fs (loop3): Stopped filesystem due to reason: 7\nkworker/u8:7: attempt to access beyond end of device\nBUG: unable to handle page fault for address: ffffed1604ea3dfa\nRIP: 0010:get_ckpt_valid_blocks fs/f2fs/segment.h:361 [inline]\nRIP: 0010:has_curseg_enough_space fs/f2fs/segment.h:570 [inline]\nRIP: 0010:__get_secs_required fs/f2fs/segment.h:620 [inline]\nRIP: 0010:has_not_enough_free_secs fs/f2fs/segment.h:633 [inline]\nRIP: 0010:has_enough_free_secs+0x575/0x1660 fs/f2fs/segment.h:649\n<TASK>\nf2fs_is_checkpoint_ready fs/f2fs/segment.h:671 [inline]\nf2fs_write_inode+0x425/0x540 fs/f2fs/inode.c:791\nwrite_inode fs/fs-writeback.c:1525 [inline]\n__writeback_single_inode+0x708/0x10d0 fs/fs-writeback.c:1745\nwriteback_sb_inodes+0x820/0x1360 fs/fs-writeback.c:1976\nwb_writeback+0x413/0xb80 fs/fs-writeback.c:2156\nwb_do_writeback fs/fs-writeback.c:2303 [inline]\nwb_workfn+0x410/0x1080 fs/fs-writeback.c:2343\nprocess_one_work kernel/workqueue.c:3236 [inline]\nprocess_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317\nworker_thread+0x870/0xd30 kernel/workqueue.c:3398\nkthread+0x7a9/0x920 kernel/kthread.c:464\nret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148\nret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\nCommit 8b10d3653735 (\"f2fs: introduce FAULT_NO_SEGMENT\") allows to trigger\nno free segment fault in allocator, then it will update curseg->segno to\nNULL_SEGNO, though, CP_ERROR_FLAG has been set, f2fs_write_inode() missed\nto check the flag, and access invalid curseg->segno directly in below call\npath, then resulting in panic:\n- f2fs_write_inode\n- f2fs_is_checkpoint_ready\n- has_enough_free_secs\n- has_not_enough_free_secs\n- __get_secs_required\n- has_curseg_enough_space\n- get_ckpt_valid_blocks\n: access invalid curseg->segno\nTo avoid this issue, let's:\n- check CP_ERROR_FLAG flag in prior to f2fs_is_checkpoint_ready() in\nf2fs_write_inode().\n- in has_curseg_enough_space(), save curseg->segno into a temp variable,\nand verify its validation before use." ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-22123\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-22123\nhttps://lore.kernel.org/linux-cve-announce/2025041628-CVE-2025-22123-5ca9@gregkh/T" ],
  "name" : "CVE-2025-22123",
  "csaw" : false
}