{"id":"DEBIAN-CVE-2023-53433","details":"In the Linux kernel, the following vulnerability has been resolved:  net: add vlan_get_protocol_and_depth() helper  Before blamed commit, pskb_may_pull() was used instead of skb_header_pointer() in __vlan_get_protocol() and friends.  Few callers depended on skb-\u003ehead being populated with MAC header, syzbot caught one of them (skb_mac_gso_segment())  Add vlan_get_protocol_and_depth() to make the intent clearer and use it where sensible.  This is a more generic fix than commit e9d3f80935b6 (\"net/af_packet: make sure to pull mac header\") which was dealing with a similar issue.  kernel BUG at include/linux/skbuff.h:2655 ! invalid opcode: 0000 [#1] SMP KASAN CPU: 0 PID: 1441 Comm: syz-executor199 Not tainted 6.1.24-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:__skb_pull include/linux/skbuff.h:2655 [inline] RIP: 0010:skb_mac_gso_segment+0x68f/0x6a0 net/core/gro.c:136 Code: fd 48 8b 5c 24 10 44 89 6b 70 48 c7 c7 c0 ae 0d 86 44 89 e6 e8 a1 91 d0 00 48 c7 c7 00 af 0d 86 48 89 de 31 d2 e8 d1 4a e9 ff \u003c0f\u003e 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 RSP: 0018:ffffc90001bd7520 EFLAGS: 00010286 RAX: ffffffff8469736a RBX: ffff88810f31dac0 RCX: ffff888115a18b00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001bd75e8 R08: ffffffff84697183 R09: fffff5200037adf9 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000012 R13: 000000000000fee5 R14: 0000000000005865 R15: 000000000000fed7 FS: 000055555633f300(0000) GS:ffff8881f6a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 0000000116fea000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: \u003cTASK\u003e [\u003cffffffff847018dd\u003e] __skb_gso_segment+0x32d/0x4c0 net/core/dev.c:3419 [\u003cffffffff8470398a\u003e] skb_gso_segment include/linux/netdevice.h:4819 [inline] [\u003cffffffff8470398a\u003e] validate_xmit_skb+0x3aa/0xee0 net/core/dev.c:3725 [\u003cffffffff84707042\u003e] __dev_queue_xmit+0x1332/0x3300 net/core/dev.c:4313 [\u003cffffffff851a9ec7\u003e] dev_queue_xmit+0x17/0x20 include/linux/netdevice.h:3029 [\u003cffffffff851b4a82\u003e] packet_snd net/packet/af_packet.c:3111 [inline] [\u003cffffffff851b4a82\u003e] packet_sendmsg+0x49d2/0x6470 net/packet/af_packet.c:3142 [\u003cffffffff84669a12\u003e] sock_sendmsg_nosec net/socket.c:716 [inline] [\u003cffffffff84669a12\u003e] sock_sendmsg net/socket.c:736 [inline] [\u003cffffffff84669a12\u003e] __sys_sendto+0x472/0x5f0 net/socket.c:2139 [\u003cffffffff84669c75\u003e] __do_sys_sendto net/socket.c:2151 [inline] [\u003cffffffff84669c75\u003e] __se_sys_sendto net/socket.c:2147 [inline] [\u003cffffffff84669c75\u003e] __x64_sys_sendto+0xe5/0x100 net/socket.c:2147 [\u003cffffffff8551d40f\u003e] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [\u003cffffffff8551d40f\u003e] do_syscall_64+0x2f/0x50 arch/x86/entry/common.c:80 [\u003cffffffff85600087\u003e] entry_SYSCALL_64_after_hwframe+0x63/0xcd","modified":"2026-09-15T09:02:44.553988271Z","published":"2025-09-18T16:15:47.343Z","upstream":["CVE-2023-53433"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53433"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.37-1"}]}],"versions":["6.1.27-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53433.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.3.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53433.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.3.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53433.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"}]}