{
  "public_date" : "2025-08-22T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic",
    "id" : "2390391",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2390391"
  },
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nf2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic\nThe decompress_io_ctx may be released asynchronously after\nI/O completion. If this file is deleted immediately after read,\nand the kworker of processing post_read_wq has not been executed yet\ndue to high workloads, It is possible that the inode(f2fs_inode_info)\nis evicted and freed before it is used f2fs_free_dic.\nThe UAF case as below:\nThread A                                      Thread B\n- f2fs_decompress_end_io\n- f2fs_put_dic\n- queue_work\nadd free_dic work to post_read_wq\n- do_unlink\n- iput\n- evict\n- call_rcu\nThis file is deleted after read.\nThread C                                 kworker to process post_read_wq\n- rcu_do_batch\n- f2fs_free_inode\n- kmem_cache_free\ninode is freed by rcu\n- process_scheduled_works\n- f2fs_late_free_dic\n- f2fs_free_dic\n- f2fs_release_decomp_mem\nread (dic->inode)->i_compress_algorithm\nThis patch store compress_algorithm and sbi in dic to avoid inode UAF.\nIn addition, the previous solution is deprecated in [1] may cause system hang.\n[1] https://lore.kernel.org/all/c36ab955-c8db-4a8b-a9d0-f07b5f426c3f@kernel.org" ],
  "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-2025-38627\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38627\nhttps://lore.kernel.org/linux-cve-announce/2025082231-CVE-2025-38627-7cb6@gregkh/T" ],
  "name" : "CVE-2025-38627",
  "csaw" : false
}