{"id":"DEBIAN-CVE-2026-63814","details":"In the Linux kernel, the following vulnerability has been resolved:  f2fs: validate ACL entry sizes in f2fs_acl_from_disk()  f2fs_acl_count() only validates the aggregate ACL xattr length. A malformed ACL can still place ACL_USER or ACL_GROUP in a slot that only contains struct f2fs_acl_entry_short bytes, and f2fs_acl_from_disk() then reads entry-\u003ee_id before verifying that a full entry fits.  Require a short entry before reading e_tag and e_perm, and require a full entry before reading e_id for ACL_USER and ACL_GROUP. Return -EFSCORRUPTED from these new truncated-entry checks, while keeping the pre-existing -EINVAL paths unchanged.  Validation reproduced this kernel report: KASAN slab-out-of-bounds in __f2fs_get_acl+0x6fb/0x7e0 RIP: 0033:0x7f4b835ea7aa The buggy address belongs to the object at ffff888114589960 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 8-byte region [ffff888114589960, ffff888114589968) Read of size 4 Call trace:   dump_stack_lvl+0x66/0xa0 (?:?)   print_report+0xce/0x630 (?:?)   __f2fs_get_acl+0x6fb/0x7e0 (fs/f2fs/acl.c:169)   srso_alias_return_thunk+0x5/0xfbef5 (?:?)   __virt_addr_valid+0x224/0x430 (?:?)   kasan_report+0xe0/0x110 (?:?)   __f2fs_get_acl+0x5/0x7e0 (fs/f2fs/acl.c:169)   __get_acl+0x281/0x380 (?:?)   vfs_get_acl+0x10b/0x190 (?:?)   do_get_acl+0x2a/0x410 (?:?)   do_get_acl+0x9/0x410 (?:?)   do_getxattr+0xe8/0x260 (?:?)   filename_getxattr+0xd1/0x140 (?:?)   do_getname+0x2d/0x2d0 (?:?)   path_getxattrat+0x16c/0x200 (?:?)   lock_release+0xc8/0x290 (?:?)   cgroup_update_frozen+0x9d/0x320 (?:?)   lockdep_hardirqs_on_prepare+0xea/0x1a0 (?:?)   trace_hardirqs_on+0x1a/0x170 (?:?)   _raw_spin_unlock_irq+0x28/0x50 (?:?)   do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)   entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)","modified":"2026-09-29T13:04:13.459939723Z","published":"2026-07-19T12:16:54.390Z","upstream":["CVE-2026-63814"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-63814"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.177-1"}]}],"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","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","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-2026-63814.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.95-1"}]}],"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","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~bpo12+1"],"ecosystem_specific":{"urgency":"not yet 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