{"id":"DEBIAN-CVE-2024-49952","details":"In the Linux kernel, the following vulnerability has been resolved:  netfilter: nf_tables: prevent nf_skb_duplicated corruption  syzbot found that nf_dup_ipv4() or nf_dup_ipv6() could write per-cpu variable nf_skb_duplicated in an unsafe way [1].  Disabling preemption as hinted by the splat is not enough, we have to disable soft interrupts as well.  [1] BUG: using __this_cpu_write() in preemptible [00000000] code: syz.4.282/6316  caller is nf_dup_ipv4+0x651/0x8f0 net/ipv4/netfilter/nf_dup_ipv4.c:87 CPU: 0 UID: 0 PID: 6316 Comm: syz.4.282 Not tainted 6.11.0-rc7-syzkaller-00104-g7052622fccb1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace:  \u003cTASK\u003e   __dump_stack lib/dump_stack.c:93 [inline]   dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119   check_preemption_disabled+0x10e/0x120 lib/smp_processor_id.c:49   nf_dup_ipv4+0x651/0x8f0 net/ipv4/netfilter/nf_dup_ipv4.c:87   nft_dup_ipv4_eval+0x1db/0x300 net/ipv4/netfilter/nft_dup_ipv4.c:30   expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]   nft_do_chain+0x4ad/0x1da0 net/netfilter/nf_tables_core.c:288   nft_do_chain_ipv4+0x202/0x320 net/netfilter/nft_chain_filter.c:23   nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]   nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626   nf_hook+0x2c4/0x450 include/linux/netfilter.h:269   NF_HOOK_COND include/linux/netfilter.h:302 [inline]   ip_output+0x185/0x230 net/ipv4/ip_output.c:433   ip_local_out net/ipv4/ip_output.c:129 [inline]   ip_send_skb+0x74/0x100 net/ipv4/ip_output.c:1495   udp_send_skb+0xacf/0x1650 net/ipv4/udp.c:981   udp_sendmsg+0x1c21/0x2a60 net/ipv4/udp.c:1269   sock_sendmsg_nosec net/socket.c:730 [inline]   __sock_sendmsg+0x1a6/0x270 net/socket.c:745   ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597   ___sys_sendmsg net/socket.c:2651 [inline]   __sys_sendmmsg+0x3b2/0x740 net/socket.c:2737   __do_sys_sendmmsg net/socket.c:2766 [inline]   __se_sys_sendmmsg net/socket.c:2763 [inline]   __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763   do_syscall_x64 arch/x86/entry/common.c:52 [inline]   do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83  entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4ce4f7def9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 RSP: 002b:00007f4ce5d4a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f4ce5135f80 RCX: 00007f4ce4f7def9 RDX: 0000000000000001 RSI: 0000000020005d40 RDI: 0000000000000006 RBP: 00007f4ce4ff0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4ce5135f80 R15: 00007ffd4cbc6d68  \u003c/TASK\u003e","modified":"2026-09-15T09:03:13.177423182Z","published":"2024-10-21T18:15:16.590Z","upstream":["CVE-2024-49952"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-49952"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.115-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","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-2024-49952.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-49952.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-49952.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"}]}