{"id":"DEBIAN-CVE-2024-36927","details":"In the Linux kernel, the following vulnerability has been resolved:  ipv4: Fix uninit-value access in __ip_make_skb()  KMSAN reported uninit-value access in __ip_make_skb() [1].  __ip_make_skb() tests HDRINCL to know if the skb has icmphdr. However, HDRINCL can cause a race condition. If calling setsockopt(2) with IP_HDRINCL changes HDRINCL while __ip_make_skb() is running, the function will access icmphdr in the skb even if it is not included. This causes the issue reported by KMSAN.  Check FLOWI_FLAG_KNOWN_NH on fl4-\u003eflowi4_flags instead of testing HDRINCL on the socket.  Also, fl4-\u003efl4_icmp_type and fl4-\u003efl4_icmp_code are not initialized. These are union in struct flowi4 and are implicitly initialized by flowi4_init_output(), but we should not rely on specific union layout.  Initialize these explicitly in raw_sendmsg().  [1] BUG: KMSAN: uninit-value in __ip_make_skb+0x2b74/0x2d20 net/ipv4/ip_output.c:1481  __ip_make_skb+0x2b74/0x2d20 net/ipv4/ip_output.c:1481  ip_finish_skb include/net/ip.h:243 [inline]  ip_push_pending_frames+0x4c/0x5c0 net/ipv4/ip_output.c:1508  raw_sendmsg+0x2381/0x2690 net/ipv4/raw.c:654  inet_sendmsg+0x27b/0x2a0 net/ipv4/af_inet.c:851  sock_sendmsg_nosec net/socket.c:730 [inline]  __sock_sendmsg+0x274/0x3c0 net/socket.c:745  __sys_sendto+0x62c/0x7b0 net/socket.c:2191  __do_sys_sendto net/socket.c:2203 [inline]  __se_sys_sendto net/socket.c:2199 [inline]  __x64_sys_sendto+0x130/0x200 net/socket.c:2199  do_syscall_64+0xd8/0x1f0 arch/x86/entry/common.c:83  entry_SYSCALL_64_after_hwframe+0x6d/0x75  Uninit was created at:  slab_post_alloc_hook mm/slub.c:3804 [inline]  slab_alloc_node mm/slub.c:3845 [inline]  kmem_cache_alloc_node+0x5f6/0xc50 mm/slub.c:3888  kmalloc_reserve+0x13c/0x4a0 net/core/skbuff.c:577  __alloc_skb+0x35a/0x7c0 net/core/skbuff.c:668  alloc_skb include/linux/skbuff.h:1318 [inline]  __ip_append_data+0x49ab/0x68c0 net/ipv4/ip_output.c:1128  ip_append_data+0x1e7/0x260 net/ipv4/ip_output.c:1365  raw_sendmsg+0x22b1/0x2690 net/ipv4/raw.c:648  inet_sendmsg+0x27b/0x2a0 net/ipv4/af_inet.c:851  sock_sendmsg_nosec net/socket.c:730 [inline]  __sock_sendmsg+0x274/0x3c0 net/socket.c:745  __sys_sendto+0x62c/0x7b0 net/socket.c:2191  __do_sys_sendto net/socket.c:2203 [inline]  __se_sys_sendto net/socket.c:2199 [inline]  __x64_sys_sendto+0x130/0x200 net/socket.c:2199  do_syscall_64+0xd8/0x1f0 arch/x86/entry/common.c:83  entry_SYSCALL_64_after_hwframe+0x6d/0x75  CPU: 1 PID: 15709 Comm: syz-executor.7 Not tainted 6.8.0-11567-gb3603fcb79b1 #25 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-1.fc39 04/01/2014","modified":"2026-09-15T09:03:07.527341923Z","published":"2024-05-30T16:15:15.957Z","upstream":["CVE-2024-36927"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-36927"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.140-1"}]}],"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","6.1.27-1","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-2024-36927.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.11-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-36927.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.11-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-36927.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}