{"id":"DEBIAN-CVE-2023-54313","details":"In the Linux kernel, the following vulnerability has been resolved:  ovl: fix null pointer dereference in ovl_get_acl_rcu()  Following process:          P1                     P2  path_openat   link_path_walk    may_lookup     inode_permission(rcu)      ovl_permission       acl_permission_check        check_acl         get_cached_acl_rcu \t ovl_get_inode_acl \t  realinode = ovl_inode_real(ovl_inode) \t                      drop_cache \t\t               __dentry_kill(ovl_dentry) \t\t\t\tiput(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 \t    ovl_inode_upper \t     upperdentry = ovl_i_dentry_upper(ovl_inode) \t     d_inode(upperdentry) // returns NULL \t  IS_POSIXACL(realinode) // NULL pointer dereference , will trigger an null pointer dereference at realinode:   [  205.472797] BUG: kernel NULL pointer dereference, address:                  0000000000000028   [  205.476701] CPU: 2 PID: 2713 Comm: ls Not tainted                  6.3.0-12064-g2edfa098e750-dirty #1216   [  205.478754] RIP: 0010:do_ovl_get_acl+0x5d/0x300   [  205.489584] Call Trace:   [  205.489812]  \u003cTASK\u003e   [  205.490014]  ovl_get_inode_acl+0x26/0x30   [  205.490466]  get_cached_acl_rcu+0x61/0xa0   [  205.490908]  generic_permission+0x1bf/0x4e0   [  205.491447]  ovl_permission+0x79/0x1b0   [  205.491917]  inode_permission+0x15e/0x2c0   [  205.492425]  link_path_walk+0x115/0x550   [  205.493311]  path_lookupat.isra.0+0xb2/0x200   [  205.493803]  filename_lookup+0xda/0x240   [  205.495747]  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":"2026-09-15T08:47:38.084319589Z","published":"2025-12-30T13:16:20.540Z","upstream":["CVE-2023-54313"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-54313"}],"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-2023-54313.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-2023-54313.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-2023-54313.json"}}],"schema_version":"1.9.0"}