{"id":"DEBIAN-CVE-2026-23407","details":"In the Linux kernel, the following vulnerability has been resolved:  apparmor: fix missing bounds check on DEFAULT table in verify_dfa()  The verify_dfa() function only checks DEFAULT_TABLE bounds when the state is not differentially encoded.  When the verification loop traverses the differential encoding chain, it reads k = DEFAULT_TABLE[j] and uses k as an array index without validation. A malformed DFA with DEFAULT_TABLE[j] \u003e= state_count, therefore, causes both out-of-bounds reads and writes.  [   57.179855] ================================================================== [   57.180549] BUG: KASAN: slab-out-of-bounds in verify_dfa+0x59a/0x660 [   57.180904] Read of size 4 at addr ffff888100eadec4 by task su/993  [   57.181554] CPU: 1 UID: 0 PID: 993 Comm: su Not tainted 6.19.0-rc7-next-20260127 #1 PREEMPT(lazy) [   57.181558] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   57.181563] Call Trace: [   57.181572]  \u003cTASK\u003e [   57.181577]  dump_stack_lvl+0x5e/0x80 [   57.181596]  print_report+0xc8/0x270 [   57.181605]  ? verify_dfa+0x59a/0x660 [   57.181608]  kasan_report+0x118/0x150 [   57.181620]  ? verify_dfa+0x59a/0x660 [   57.181623]  verify_dfa+0x59a/0x660 [   57.181627]  aa_dfa_unpack+0x1610/0x1740 [   57.181629]  ? __kmalloc_cache_noprof+0x1d0/0x470 [   57.181640]  unpack_pdb+0x86d/0x46b0 [   57.181647]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181653]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181656]  ? aa_unpack_nameX+0x1a8/0x300 [   57.181659]  aa_unpack+0x20b0/0x4c30 [   57.181662]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181664]  ? stack_depot_save_flags+0x33/0x700 [   57.181681]  ? kasan_save_track+0x4f/0x80 [   57.181683]  ? kasan_save_track+0x3e/0x80 [   57.181686]  ? __kasan_kmalloc+0x93/0xb0 [   57.181688]  ? __kvmalloc_node_noprof+0x44a/0x780 [   57.181693]  ? aa_simple_write_to_buffer+0x54/0x130 [   57.181697]  ? policy_update+0x154/0x330 [   57.181704]  aa_replace_profiles+0x15a/0x1dd0 [   57.181707]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181710]  ? __kvmalloc_node_noprof+0x44a/0x780 [   57.181712]  ? aa_loaddata_alloc+0x77/0x140 [   57.181715]  ? srso_alias_return_thunk+0x5/0xfbef5 [   57.181717]  ? _copy_from_user+0x2a/0x70 [   57.181730]  policy_update+0x17a/0x330 [   57.181733]  profile_replace+0x153/0x1a0 [   57.181735]  ? rw_verify_area+0x93/0x2d0 [   57.181740]  vfs_write+0x235/0xab0 [   57.181745]  ksys_write+0xb0/0x170 [   57.181748]  do_syscall_64+0x8e/0x660 [   57.181762]  entry_SYSCALL_64_after_hwframe+0x76/0x7e [   57.181765] RIP: 0033:0x7f6192792eb2  Remove the MATCH_FLAG_DIFF_ENCODE condition to validate all DEFAULT_TABLE entries unconditionally.","modified":"2026-09-01T16:06:35.549807856Z","published":"2026-04-01T09:16:16.527Z","upstream":["CVE-2026-23407"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-23407"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.164-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","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","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23407.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.74-2"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23407.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.19.6-2"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23407.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:H/I:H/A:H"}]}