{"id":"AZL-64526","summary":"CVE-2025-38147 affecting package kernel for versions less than 6.6.96.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncalipso: Don't call calipso functions for AF_INET sk.\n\nsyzkaller reported a null-ptr-deref in txopt_get(). [0]\n\nThe offset 0x70 was of struct ipv6_txoptions in struct ipv6_pinfo,\nso struct ipv6_pinfo was NULL there.\n\nHowever, this never happens for IPv6 sockets as inet_sk(sk)-\u003epinet6\nis always set in inet6_create(), meaning the socket was not IPv6 one.\n\nThe root cause is missing validation in netlbl_conn_setattr().\n\nnetlbl_conn_setattr() switches branches based on struct\nsockaddr.sa_family, which is passed from userspace.  However,\nnetlbl_conn_setattr() does not check if the address family matches\nthe socket.\n\nThe syzkaller must have called connect() for an IPv6 address on\nan IPv4 socket.\n\nWe have a proper validation in tcp_v[46]_connect(), but\nsecurity_socket_connect() is called in the earlier stage.\n\nLet's copy the validation to netlbl_conn_setattr().\n\n[0]:\nOops: general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]\nCPU: 2 UID: 0 PID: 12928 Comm: syz.9.1677 Not tainted 6.12.0 #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nRIP: 0010:txopt_get include/net/ipv6.h:390 [inline]\nRIP: 0010:\nCode: 02 00 00 49 8b ac 24 f8 02 00 00 e8 84 69 2a fd e8 ff 00 16 fd 48 8d 7d 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 \u003c80\u003e 3c 02 00 0f 85 53 02 00 00 48 8b 6d 70 48 85 ed 0f 84 ab 01 00\nRSP: 0018:ffff88811b8afc48 EFLAGS: 00010212\nRAX: dffffc0000000000 RBX: 1ffff11023715f8a RCX: ffffffff841ab00c\nRDX: 000000000000000e RSI: ffffc90007d9e000 RDI: 0000000000000070\nRBP: 0000000000000000 R08: ffffed1023715f9d R09: ffffed1023715f9e\nR10: ffffed1023715f9d R11: 0000000000000003 R12: ffff888123075f00\nR13: ffff88810245bd80 R14: ffff888113646780 R15: ffff888100578a80\nFS:  00007f9019bd7640(0000) GS:ffff8882d2d00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f901b927bac CR3: 0000000104788003 CR4: 0000000000770ef0\nPKRU: 80000000\nCall Trace:\n \u003cTASK\u003e\n calipso_sock_setattr+0x56/0x80 net/netlabel/netlabel_calipso.c:557\n netlbl_conn_setattr+0x10c/0x280 net/netlabel/netlabel_kapi.c:1177\n selinux_netlbl_socket_connect_helper+0xd3/0x1b0 security/selinux/netlabel.c:569\n selinux_netlbl_socket_connect_locked security/selinux/netlabel.c:597 [inline]\n selinux_netlbl_socket_connect+0xb6/0x100 security/selinux/netlabel.c:615\n selinux_socket_connect+0x5f/0x80 security/selinux/hooks.c:4931\n security_socket_connect+0x50/0xa0 security/security.c:4598\n __sys_connect_file+0xa4/0x190 net/socket.c:2067\n __sys_connect+0x12c/0x170 net/socket.c:2088\n __do_sys_connect net/socket.c:2098 [inline]\n __se_sys_connect net/socket.c:2095 [inline]\n __x64_sys_connect+0x73/0xb0 net/socket.c:2095\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xaa/0x1b0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f901b61a12d\nCode: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f9019bd6fa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a\nRAX: ffffffffffffffda RBX: 00007f901b925fa0 RCX: 00007f901b61a12d\nRDX: 000000000000001c RSI: 0000200000000140 RDI: 0000000000000003\nRBP: 00007f901b701505 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 0000000000000000 R14: 00007f901b5b62a0 R15: 00007f9019bb7000\n \u003c/TASK\u003e\nModules linked in:","modified":"2026-04-01T05:20:21.313481Z","published":"2025-07-03T09:15:29Z","upstream":["CVE-2025-38147"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38147"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.96.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-64526.json"}}],"schema_version":"1.7.5"}