{
  "threat_severity" : "Low",
  "public_date" : "2025-12-30T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Linux kernel OverlayFS: Kernel crash via null pointer dereference in ovl_get_acl_rcu()",
    "id" : "2426085",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2426085"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-476",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\novl: fix null pointer dereference in ovl_get_acl_rcu()\nFollowing process:\nP1                     P2\npath_openat\nlink_path_walk\nmay_lookup\ninode_permission(rcu)\novl_permission\nacl_permission_check\ncheck_acl\nget_cached_acl_rcu\novl_get_inode_acl\nrealinode = ovl_inode_real(ovl_inode)\ndrop_cache\n__dentry_kill(ovl_dentry)\niput(ovl_inode)\novl_destroy_inode(ovl_inode)\ndput(oi->__upperdentry)\ndentry_kill(upperdentry)\ndentry_unlink_inode\nupperdentry->d_inode = NULL\novl_inode_upper\nupperdentry = ovl_i_dentry_upper(ovl_inode)\nd_inode(upperdentry) // returns NULL\nIS_POSIXACL(realinode) // NULL pointer dereference\n, will trigger an null pointer dereference at realinode:\n[  205.472797] BUG: kernel NULL pointer dereference, address:\n0000000000000028\n[  205.476701] CPU: 2 PID: 2713 Comm: ls Not tainted\n6.3.0-12064-g2edfa098e750-dirty #1216\n[  205.478754] RIP: 0010:do_ovl_get_acl+0x5d/0x300\n[  205.489584] Call Trace:\n[  205.489812]  <TASK>\n[  205.490014]  ovl_get_inode_acl+0x26/0x30\n[  205.490466]  get_cached_acl_rcu+0x61/0xa0\n[  205.490908]  generic_permission+0x1bf/0x4e0\n[  205.491447]  ovl_permission+0x79/0x1b0\n[  205.491917]  inode_permission+0x15e/0x2c0\n[  205.492425]  link_path_walk+0x115/0x550\n[  205.493311]  path_lookupat.isra.0+0xb2/0x200\n[  205.493803]  filename_lookup+0xda/0x240\n[  205.495747]  vfs_fstatat+0x7b/0xb0\nFetch a reproducer in [Link].\nUse the helper ovl_i_path_realinode() to get realinode and then do\nnon-nullptr checking.", "A flaw was found in the OverlayFS (ovl) component of the Linux kernel. A local user can trigger a null pointer dereference by performing a specific sequence of file system operations. This vulnerability occurs when the ovl_get_acl_rcu() function attempts to access a real inode that has been set to NULL due to a race condition during inode destruction. Successful exploitation leads to a kernel crash, causing a Denial of Service (DoS)." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-05-13T00:00:00Z",
    "advisory" : "RHSA-2025:6966",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-570.12.1.el9_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-05-13T00:00:00Z",
    "advisory" : "RHSA-2025:6966",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-570.12.1.el9_6"
  } ],
  "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" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2023-54313\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-54313\nhttps://lore.kernel.org/linux-cve-announce/2025123036-CVE-2023-54313-f889@gregkh/T" ],
  "name" : "CVE-2023-54313",
  "csaw" : false
}