{
  "public_date" : "2026-03-04T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: f2fs: fix to avoid UAF in f2fs_write_end_io()",
    "id" : "2444390",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2444390"
  },
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nf2fs: fix to avoid UAF in f2fs_write_end_io()\nAs syzbot reported an use-after-free issue in f2fs_write_end_io().\nIt is caused by below race condition:\nloop deviceumount\n- worker_thread\n- loop_process_work\n- do_req_filebacked\n- lo_rw_aio\n- lo_rw_aio_complete\n- blk_mq_end_request\n- blk_update_request\n- f2fs_write_end_io\n- dec_page_count\n- folio_end_writeback\n- kill_f2fs_super\n- kill_block_super\n- f2fs_put_super\n: free(sbi)\n: get_pages(, F2FS_WB_CP_DATA)\naccessed sbi which is freed\nIn kill_f2fs_super(), we will drop all page caches of f2fs inodes before\ncall free(sbi), it guarantee that all folios should end its writeback, so\nit should be safe to access sbi before last folio_end_writeback().\nLet's relocate ckpt thread wakeup flow before folio_end_writeback() to\nresolve this issue." ],
  "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-2026-23234\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23234\nhttps://lore.kernel.org/linux-cve-announce/2026030439-CVE-2026-23234-5cef@gregkh/T" ],
  "name" : "CVE-2026-23234",
  "csaw" : false
}