{"id":"CVE-2024-35973","state":"PUBLISHED","title":"geneve: fix header validation in geneve[6]_xmit_skb","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: fix header validation in geneve[6]_xmit_skb\n\nsyzbot is able to trigger an uninit-value in geneve_xmit() [1]\n\nProblem : While most ip tunnel helpers (like ip_tunnel_get_dsfield())\nuses skb_protocol(skb, true), pskb_inet_may_pull() is only using\nskb->protocol.\n\nIf anything else than ETH_P_IPV6 or ETH_P_IP is found in skb->protocol,\npskb_inet_may_pull() does nothing at all.\n\nIf a vlan tag was provided by the caller (af_packet in the syzbot case),\nthe network header might not point to the correct location, and skb\nlinear part could be smaller than expected.\n\nAdd skb_vlan_inet_prepare() to perform a complete mac validation.\n\nUse this in geneve for the moment, I suspect we need to adopt this\nmore broadly.\n\nv4 - Jakub reported v3 broke l2_tos_ttl_inherit.sh selftest\n   - Only call __vlan_get_protocol() for vlan types.\n\nv2,v3 - Addressed Sabrina comments on v1 and v2\n\n[1]\n\nBUG: KMSAN: uninit-value in geneve_xmit_skb drivers/net/geneve.c:910 [inline]\n BUG: KMSAN: uninit-value in geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030\n  geneve_xmit_skb drivers/net/geneve.c:910 [inline]\n  geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030\n  __netdev_start_xmit include/linux/netdevice.h:4903 [inline]\n  netdev_start_xmit include/linux/netdevice.h:4917 [inline]\n  xmit_one net/core/dev.c:3531 [inline]\n  dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\n  __dev_queue_xmit+0x348d/0x52c0 net/core/dev.c:4335\n  dev_queue_xmit include/linux/netdevice.h:3091 [inline]\n  packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276\n  packet_snd net/packet/af_packet.c:3081 [inline]\n  packet_sendmsg+0x8bb0/0x9ef0 net/packet/af_packet.c:3113\n  sock_sendmsg_nosec net/socket.c:730 [inline]\n  __sock_sendmsg+0x30f/0x380 net/socket.c:745\n  __sys_sendto+0x685/0x830 net/socket.c:2191\n  __do_sys_sendto net/socket.c:2203 [inline]\n  __se_sys_sendto net/socket.c:2199 [inline]\n  __x64_sys_sendto+0x125/0x1d0 net/socket.c:2199\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nUninit was created at:\n  slab_post_alloc_hook mm/slub.c:3804 [inline]\n  slab_alloc_node mm/slub.c:3845 [inline]\n  kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577\n  __alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668\n  alloc_skb include/linux/skbuff.h:1318 [inline]\n  alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504\n  sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795\n  packet_alloc_skb net/packet/af_packet.c:2930 [inline]\n  packet_snd net/packet/af_packet.c:3024 [inline]\n  packet_sendmsg+0x722d/0x9ef0 net/packet/af_packet.c:3113\n  sock_sendmsg_nosec net/socket.c:730 [inline]\n  __sock_sendmsg+0x30f/0x380 net/socket.c:745\n  __sys_sendto+0x685/0x830 net/socket.c:2191\n  __do_sys_sendto net/socket.c:2203 [inline]\n  __se_sys_sendto net/socket.c:2199 [inline]\n  __x64_sys_sendto+0x125/0x1d0 net/socket.c:2199\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nCPU: 0 PID: 5033 Comm: syz-executor346 Not tainted 6.9.0-rc1-syzkaller-00005-g928a87efa423 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024","publishedAt":"2024-05-20T09:42:00.475Z","updatedAt":"2026-10-15T00:41:50.846Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"35385daa8db320d2d9664930c28e732578b0d7de","status":"affected","lessThan":"43be590456e1f3566054ce78ae2dbb68cbe1a536","versionType":"git"},{"version":"6f92124d74419797fadfbcd5b7a72c384a6413ad","status":"affected","lessThan":"d3adf11d7993518a39bd02b383cfe657ccc0023c","versionType":"git"},{"version":"71ad9260c001b217d704cda88ecea251b2d367da","status":"affected","lessThan":"10204df9beda4978bd1d0c2db0d8375bfb03b915","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"3c1ae6de74e3d2d6333d29a2d3e13e6094596c79","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"4a1b65d1e55d53b397cb27014208be1e04172670","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"190d9efa5773f26d6f334b1b8be282c4fa13fd5e","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"357163fff3a6e48fe74745425a32071ec9caf852","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"d8a6213d70accb403b82924a1c229e733433a5ef","versionType":"git"},{"version":"9a51e36ebf433adf59c051bec33f5aa54640bb4d","status":"affected","versionType":"git"},{"version":"21815f28af8081b258552c111774ff320cf38d38","status":"affected","versionType":"git"},{"version":"4.19.191","status":"affected","lessThan":"4.19.313","versionType":"semver"},{"version":"5.4.119","status":"affected","lessThan":"5.4.275","versionType":"semver"},{"version":"5.10.37","status":"affected","lessThan":"5.10.216","versionType":"semver"},{"version":"5.11.21","status":"affected","lessThan":"5.12","versionType":"semver"},{"version":"5.12.4","status":"affected","lessThan":"5.13","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/geneve.c","include/net/ip_tunnels.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"4.19.313","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.275","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.216","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.156","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.87","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.28","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.8.7","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/geneve.c","include/net/ip_tunnels.h"]}],"references":["https://git.kernel.org/stable/c/43be590456e1f3566054ce78ae2dbb68cbe1a536","https://git.kernel.org/stable/c/d3adf11d7993518a39bd02b383cfe657ccc0023c","https://git.kernel.org/stable/c/10204df9beda4978bd1d0c2db0d8375bfb03b915","https://git.kernel.org/stable/c/3c1ae6de74e3d2d6333d29a2d3e13e6094596c79","https://git.kernel.org/stable/c/4a1b65d1e55d53b397cb27014208be1e04172670","https://git.kernel.org/stable/c/190d9efa5773f26d6f334b1b8be282c4fa13fd5e","https://git.kernel.org/stable/c/357163fff3a6e48fe74745425a32071ec9caf852","https://git.kernel.org/stable/c/d8a6213d70accb403b82924a1c229e733433a5ef","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html","https://cert-portal.siemens.com/productcert/html/ssa-265688.html","https://cert-portal.siemens.com/productcert/html/ssa-613116.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:30.303Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/35xxx/CVE-2024-35973.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-35973","state":"PUBLISHED","datePublished":"2024-05-20T09:42:00.475Z","dateUpdated":"2026-10-15T00:41:50.846Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-17T13:50:33.142Z"},"containers":{"cna":{"title":"geneve: fix header validation in geneve[6]_xmit_skb","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: fix header validation in geneve[6]_xmit_skb\n\nsyzbot is able to trigger an uninit-value in geneve_xmit() [1]\n\nProblem : While most ip tunnel helpers (like ip_tunnel_get_dsfield())\nuses skb_protocol(skb, true), pskb_inet_may_pull() is only using\nskb->protocol.\n\nIf anything else than ETH_P_IPV6 or ETH_P_IP is found in skb->protocol,\npskb_inet_may_pull() does nothing at all.\n\nIf a vlan tag was provided by the caller (af_packet in the syzbot case),\nthe network header might not point to the correct location, and skb\nlinear part could be smaller than expected.\n\nAdd skb_vlan_inet_prepare() to perform a complete mac validation.\n\nUse this in geneve for the moment, I suspect we need to adopt this\nmore broadly.\n\nv4 - Jakub reported v3 broke l2_tos_ttl_inherit.sh selftest\n   - Only call __vlan_get_protocol() for vlan types.\n\nv2,v3 - Addressed Sabrina comments on v1 and v2\n\n[1]\n\nBUG: KMSAN: uninit-value in geneve_xmit_skb drivers/net/geneve.c:910 [inline]\n BUG: KMSAN: uninit-value in geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030\n  geneve_xmit_skb drivers/net/geneve.c:910 [inline]\n  geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030\n  __netdev_start_xmit include/linux/netdevice.h:4903 [inline]\n  netdev_start_xmit include/linux/netdevice.h:4917 [inline]\n  xmit_one net/core/dev.c:3531 [inline]\n  dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\n  __dev_queue_xmit+0x348d/0x52c0 net/core/dev.c:4335\n  dev_queue_xmit include/linux/netdevice.h:3091 [inline]\n  packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276\n  packet_snd net/packet/af_packet.c:3081 [inline]\n  packet_sendmsg+0x8bb0/0x9ef0 net/packet/af_packet.c:3113\n  sock_sendmsg_nosec net/socket.c:730 [inline]\n  __sock_sendmsg+0x30f/0x380 net/socket.c:745\n  __sys_sendto+0x685/0x830 net/socket.c:2191\n  __do_sys_sendto net/socket.c:2203 [inline]\n  __se_sys_sendto net/socket.c:2199 [inline]\n  __x64_sys_sendto+0x125/0x1d0 net/socket.c:2199\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nUninit was created at:\n  slab_post_alloc_hook mm/slub.c:3804 [inline]\n  slab_alloc_node mm/slub.c:3845 [inline]\n  kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577\n  __alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668\n  alloc_skb include/linux/skbuff.h:1318 [inline]\n  alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504\n  sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795\n  packet_alloc_skb net/packet/af_packet.c:2930 [inline]\n  packet_snd net/packet/af_packet.c:3024 [inline]\n  packet_sendmsg+0x722d/0x9ef0 net/packet/af_packet.c:3113\n  sock_sendmsg_nosec net/socket.c:730 [inline]\n  __sock_sendmsg+0x30f/0x380 net/socket.c:745\n  __sys_sendto+0x685/0x830 net/socket.c:2191\n  __do_sys_sendto net/socket.c:2203 [inline]\n  __se_sys_sendto net/socket.c:2199 [inline]\n  __x64_sys_sendto+0x125/0x1d0 net/socket.c:2199\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nCPU: 0 PID: 5033 Comm: syz-executor346 Not tainted 6.9.0-rc1-syzkaller-00005-g928a87efa423 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"35385daa8db320d2d9664930c28e732578b0d7de","status":"affected","lessThan":"43be590456e1f3566054ce78ae2dbb68cbe1a536","versionType":"git"},{"version":"6f92124d74419797fadfbcd5b7a72c384a6413ad","status":"affected","lessThan":"d3adf11d7993518a39bd02b383cfe657ccc0023c","versionType":"git"},{"version":"71ad9260c001b217d704cda88ecea251b2d367da","status":"affected","lessThan":"10204df9beda4978bd1d0c2db0d8375bfb03b915","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"3c1ae6de74e3d2d6333d29a2d3e13e6094596c79","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"4a1b65d1e55d53b397cb27014208be1e04172670","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"190d9efa5773f26d6f334b1b8be282c4fa13fd5e","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"357163fff3a6e48fe74745425a32071ec9caf852","versionType":"git"},{"version":"d13f048dd40e8577260cd43faea8ec9b77520197","status":"affected","lessThan":"d8a6213d70accb403b82924a1c229e733433a5ef","versionType":"git"},{"version":"9a51e36ebf433adf59c051bec33f5aa54640bb4d","status":"affected","versionType":"git"},{"version":"21815f28af8081b258552c111774ff320cf38d38","status":"affected","versionType":"git"},{"version":"4.19.191","status":"affected","lessThan":"4.19.313","versionType":"semver"},{"version":"5.4.119","status":"affected","lessThan":"5.4.275","versionType":"semver"},{"version":"5.10.37","status":"affected","lessThan":"5.10.216","versionType":"semver"},{"version":"5.11.21","status":"affected","lessThan":"5.12","versionType":"semver"},{"version":"5.12.4","status":"affected","lessThan":"5.13","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/geneve.c","include/net/ip_tunnels.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"4.19.313","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.275","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.216","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.156","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.87","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.28","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.8.7","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/geneve.c","include/net/ip_tunnels.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/43be590456e1f3566054ce78ae2dbb68cbe1a536"},{"url":"https://git.kernel.org/stable/c/d3adf11d7993518a39bd02b383cfe657ccc0023c"},{"url":"https://git.kernel.org/stable/c/10204df9beda4978bd1d0c2db0d8375bfb03b915"},{"url":"https://git.kernel.org/stable/c/3c1ae6de74e3d2d6333d29a2d3e13e6094596c79"},{"url":"https://git.kernel.org/stable/c/4a1b65d1e55d53b397cb27014208be1e04172670"},{"url":"https://git.kernel.org/stable/c/190d9efa5773f26d6f334b1b8be282c4fa13fd5e"},{"url":"https://git.kernel.org/stable/c/357163fff3a6e48fe74745425a32071ec9caf852"},{"url":"https://git.kernel.org/stable/c/d8a6213d70accb403b82924a1c229e733433a5ef"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T15:45:36.681Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.191","versionEndExcluding":"4.19.313"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.119","versionEndExcluding":"5.4.275"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.37","versionEndExcluding":"5.10.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"5.15.156"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.1.87"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.6.28"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versio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