{"id":"DEBIAN-CVE-2022-49228","details":"In the Linux kernel, the following vulnerability has been resolved:  bpf: Fix a btf decl_tag bug when tagging a function  syzbot reported a btf decl_tag bug with stack trace below:    general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN   KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]   CPU: 0 PID: 3592 Comm: syz-executor914 Not tainted 5.16.0-syzkaller-11424-gb7892f7d5cb2 #0   Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011   RIP: 0010:btf_type_vlen include/linux/btf.h:231 [inline]   RIP: 0010:btf_decl_tag_resolve+0x83e/0xaa0 kernel/bpf/btf.c:3910   ...   Call Trace:    \u003cTASK\u003e    btf_resolve+0x251/0x1020 kernel/bpf/btf.c:4198    btf_check_all_types kernel/bpf/btf.c:4239 [inline]    btf_parse_type_sec kernel/bpf/btf.c:4280 [inline]    btf_parse kernel/bpf/btf.c:4513 [inline]    btf_new_fd+0x19fe/0x2370 kernel/bpf/btf.c:6047    bpf_btf_load kernel/bpf/syscall.c:4039 [inline]    __sys_bpf+0x1cbb/0x5970 kernel/bpf/syscall.c:4679    __do_sys_bpf kernel/bpf/syscall.c:4738 [inline]    __se_sys_bpf kernel/bpf/syscall.c:4736 [inline]    __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4736    do_syscall_x64 arch/x86/entry/common.c:50 [inline]    do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80    entry_SYSCALL_64_after_hwframe+0x44/0xae  The kasan error is triggered with an illegal BTF like below:    type 0: void    type 1: int    type 2: decl_tag to func type 3    type 3: func to func_proto type 8 The total number of types is 4 and the type 3 is illegal since its func_proto type is out of range.  Currently, the target type of decl_tag can be struct/union, var or func. Both struct/union and var implemented their own 'resolve' callback functions and hence handled properly in kernel. But func type doesn't have 'resolve' callback function. When btf_decl_tag_resolve() tries to check func type, it tries to get vlen of its func_proto type, which triggered the above kasan error.  To fix the issue, btf_decl_tag_resolve() needs to do btf_func_check() before trying to accessing func_proto type. In the current implementation, func type is checked with btf_func_check() in the main checking function btf_check_all_types(). To fix the above kasan issue, let us implement 'resolve' callback func type properly. The 'resolve' callback will be also called in btf_check_all_types() for func types.","modified":"2026-08-27T23:04:18.013673845Z","published":"2025-02-26T07:00:59.840Z","upstream":["CVE-2022-49228"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49228"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49228.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49228.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49228.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"}]}