{"id":"CVE-2026-23003","revision":null,"records":[{"revision":"c8a2da01646b46d59c25a8c01dcf80be","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23003","aliases":[],"title":"ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()\n\nBlamed commit did not take care of VLAN encapsulations\nas spotted by syzbot [1].\n\nUse skb_vlan_inet_prepare() instead of pskb_inet_may_pull().\n\n[1]\n BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\n BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\n BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7a8/0x1fa0 include/net/inet_ecn.h:321\n __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\n INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\n IP6_ECN_decapsulate+0x7a8/0x1fa0 include/net/inet_ecn.h:321\n ip6ip6_dscp_ecn_decapsulate+0x16f/0x1b0 net/ipv6/ip6_tunnel.c:729\n __ip6_tnl_rcv+0xed9/0x1b50 net/ipv6/ip6_tunnel.c:860\n ip6_tnl_rcv+0xc3/0x100 net/ipv6/ip6_tunnel.c:903\n gre_rcv+0x1529/0x1b90 net/ipv6/ip6_gre.c:-1\n ip6_protocol_deliver_rcu+0x1c89/0x2c60 net/ipv6/ip6_input.c:438\n ip6_input_finish+0x1f4/0x4a0 net/ipv6/ip6_input.c:489\n NF_HOOK include/linux/netfilter.h:318 [inline]\n ip6_input+0x9c/0x330 net/ipv6/ip6_input.c:500\n ip6_mc_input+0x7ca/0xc10 net/ipv6/ip6_input.c:590\n dst_input include/net/dst.h:474 [inline]\n ip6_rcv_finish+0x958/0x990 net/ipv6/ip6_input.c:79\n NF_HOOK include/linux/netfilter.h:318 [inline]\n ipv6_rcv+0xf1/0x3c0 net/ipv6/ip6_input.c:311\n __netif_receive_skb_one_core net/core/dev.c:6139 [inline]\n __netif_receive_skb+0x1df/0xac0 net/core/dev.c:6252\n netif_receive_skb_internal net/core/dev.c:6338 [inline]\n netif_receive_skb+0x57/0x630 net/core/dev.c:6397\n tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485\n tun_get_user+0x5c0e/0x6c60 drivers/net/tun.c:1953\n tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1999\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0xbe2/0x15d0 fs/read_write.c:686\n ksys_write fs/read_write.c:738 [inline]\n __do_sys_write fs/read_write.c:749 [inline]\n __se_sys_write fs/read_write.c:746 [inline]\n __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746\n x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4960 [inline]\n slab_alloc_node mm/slub.c:5263 [inline]\n kmem_cache_alloc_node_noprof+0x9e7/0x17a0 mm/slub.c:5315\n kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:586\n __alloc_skb+0x805/0x1040 net/core/skbuff.c:690\n alloc_skb include/linux/skbuff.h:1383 [inline]\n alloc_skb_with_frags+0xc5/0xa60 net/core/skbuff.c:6712\n sock_alloc_send_pskb+0xacc/0xc60 net/core/sock.c:2995\n tun_alloc_skb drivers/net/tun.c:1461 [inline]\n tun_get_user+0x1142/0x6c60 drivers/net/tun.c:1794\n tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1999\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0xbe2/0x15d0 fs/read_write.c:686\n ksys_write fs/read_write.c:738 [inline]\n __do_sys_write fs/read_write.c:749 [inline]\n __se_sys_write fs/read_write.c:746 [inline]\n __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746\n x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nCPU: 0 UID: 0 PID: 6465 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025","state":0,"publishedAt":"2026-01-25T14:36:17.491+00:00","modifiedAt":"2026-10-19T18:25:27.372+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv6/ip6_tunnel.c\"\n ],\n \"versions\": [\n {\n \"version\": \"a9bc32879a08f23cdb80a48c738017e39aea1080\",\n \"lessThan\": \"f9c5c5b791d3850570796f9e067629474e613796\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"af6b5c50d47ab43e5272ad61935d0ed2e264d3f0\",\n \"lessThan\": \"64c71d60a21a9ed0a802483dcd422b5b24eb1abe\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d54e4da98bbfa8c257bdca94c49652d81d18a4d8\",\n \"lessThan\": \"9e1c8c2a33d0a7b1f637b5d0602fe56ed10166af\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"350a6640fac4b53564ec20aa3f4a0922cb0ba5e6\",\n \"lessThan\": \"2f03dafea0a8096a2eb60f551218b360e5bab9a3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8d975c15c0cd744000ca386247432d57b21f9df0\",\n \"lessThan\": \"df5ffde9669314500809bc498ae73d6d3d9519ac\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8d975c15c0cd744000ca386247432d57b21f9df0\",\n \"lessThan\": \"b9f915340f25cae1562f18e1eb52deafca328414\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8d975c15c0cd744000ca386247432d57b21f9df0\",\n \"lessThan\": \"81c734dae203757fb3c9eee6f9896386940776bd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"c835df3bcc14858ae9b27315dd7de76370b94f3a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.210\",\n \"lessThan\": \"5.10.249\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.149\",\n \"lessThan\": \"5.15.199\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.77\",\n \"lessThan\": \"6.1.162\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.16\",\n \"lessThan\": \"6.6.122\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.7.4\",\n \"lessThan\": \"6.8\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv6/ip6_tunnel.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.8\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.8\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.249\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.199\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.162\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.122\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.67\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.7\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/f9c5c5b791d3850570796f9e067629474e613796","https://git.kernel.org/stable/c/64c71d60a21a9ed0a802483dcd422b5b24eb1abe","https://git.kernel.org/stable/c/9e1c8c2a33d0a7b1f637b5d0602fe56ed10166af","https://git.kernel.org/stable/c/2f03dafea0a8096a2eb60f551218b360e5bab9a3","https://git.kernel.org/stable/c/df5ffde9669314500809bc498ae73d6d3d9519ac","https://git.kernel.org/stable/c/b9f915340f25cae1562f18e1eb52deafca328414","https://git.kernel.org/stable/c/81c734dae203757fb3c9eee6f9896386940776bd"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23003","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23003","identifiers":["CVE-2026-23003"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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