{"id":"DEBIAN-CVE-2023-53260","details":"In the Linux kernel, the following vulnerability has been resolved:  ovl: fix null pointer dereference in ovl_permission()  Following process:           P1                     P2  path_lookupat   link_path_walk    inode_permission     ovl_permission       ovl_i_path_real(inode, &realpath)         path-\u003edentry = ovl_i_dentry_upper(inode)                           drop_cache \t\t\t   __dentry_kill(ovl_dentry) \t\t            iput(ovl_inode) \t\t             ovl_destroy_inode(ovl_inode) \t\t              dput(oi-\u003e__upperdentry) \t\t               dentry_kill(upperdentry) \t\t                dentry_unlink_inode \t\t\t\t upperdentry-\u003ed_inode = NULL       realinode = d_inode(realpath.dentry) // return NULL       inode_permission(realinode)        inode-\u003ei_sb  // NULL pointer dereference , will trigger an null pointer dereference at realinode:   [  335.664979] BUG: kernel NULL pointer dereference,                  address: 0000000000000002   [  335.668032] CPU: 0 PID: 2592 Comm: ls Not tainted 6.3.0   [  335.669956] RIP: 0010:inode_permission+0x33/0x2c0   [  335.678939] Call Trace:   [  335.679165]  \u003cTASK\u003e   [  335.679371]  ovl_permission+0xde/0x320   [  335.679723]  inode_permission+0x15e/0x2c0   [  335.680090]  link_path_walk+0x115/0x550   [  335.680771]  path_lookupat.isra.0+0xb2/0x200   [  335.681170]  filename_lookup+0xda/0x240   [  335.681922]  vfs_statx+0xa6/0x1f0   [  335.682233]  vfs_fstatat+0x7b/0xb0  Fetch a reproducer in [Link].  Use the helper ovl_i_path_realinode() to get realinode and then do non-nullptr checking.","modified":"2026-09-15T09:02:50.866299636Z","published":"2025-09-15T15:15:53.430Z","upstream":["CVE-2023-53260"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53260"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.52-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53260.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.4.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53260.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.4.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53260.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}