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vuln-cve/data/2024/26xxx/CVE-2024-26663.json
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{
"dataType": "CVE_RECORD",
"cveMetadata": {
"cveId": "CVE-2024-26663",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-02-19T14:20:24.148Z",
"datePublished": "2024-04-02T06:22:12.537Z",
"dateUpdated": "2026-08-05T11:26:37.773Z"
},
"containers": {
"cna": {
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"dateUpdated": "2026-08-05T11:26:37.773Z"
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: Check the bearer type before calling tipc_udp_nl_bearer_add()\n\nsyzbot reported the following general protection fault [1]:\n\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000010: 0000 [#1] PREEMPT SMP KASAN\nKASAN: null-ptr-deref in range [0x0000000000000080-0x0000000000000087]\n...\nRIP: 0010:tipc_udp_is_known_peer+0x9c/0x250 net/tipc/udp_media.c:291\n...\nCall Trace:\n <TASK>\n tipc_udp_nl_bearer_add+0x212/0x2f0 net/tipc/udp_media.c:646\n tipc_nl_bearer_add+0x21e/0x360 net/tipc/bearer.c:1089\n genl_family_rcv_msg_doit+0x1fc/0x2e0 net/netlink/genetlink.c:972\n genl_family_rcv_msg net/netlink/genetlink.c:1052 [inline]\n genl_rcv_msg+0x561/0x800 net/netlink/genetlink.c:1067\n netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2544\n genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076\n netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\n netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367\n netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1909\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0xd5/0x180 net/socket.c:745\n ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584\n ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638\n __sys_sendmsg+0x117/0x1e0 net/socket.c:2667\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nThe cause of this issue is that when tipc_nl_bearer_add() is called with\nthe TIPC_NLA_BEARER_UDP_OPTS attribute, tipc_udp_nl_bearer_add() is called\neven if the bearer is not UDP.\n\ntipc_udp_is_known_peer() called by tipc_udp_nl_bearer_add() assumes that\nthe media_ptr field of the tipc_bearer has an udp_bearer type object, so\nthe function goes crazy for non-UDP bearers.\n\nThis patch fixes the issue by checking the bearer type before calling\ntipc_udp_nl_bearer_add() in tipc_nl_bearer_add()."
}
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"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
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"lang": "en",
"value": "AV:L - The vulnerable code is reached only through a local generic-netlink `sendmsg` (TIPC_NL_BEARER_ADD), not via remotely received packets, so the attack surface is local.\nAC:L - The attacker controls all preconditions (creating the namespace, a non-UDP bearer, and the malformed netlink message) and can trigger the type confusion deterministically.\nPR:L - TIPC genl ops carry no GENL_ADMIN_PERM check, and even the bearer setup requiring CAP_NET_ADMIN is obtainable by an unprivileged user via user namespaces (unshare -Urn) since TIPC is netns-aware.\nUI:N - The attacker triggers the bug entirely on their own by sending a netlink message; no action from any other user is required.\nS:U - The type confusion and its consequences remain within the kernel's own security authority; no boundary such as a VM or IOMMU is crossed.\nC:H - The type confusion reads a struct net_device as a udp_bearer and dereferences list pointers taken from adjacent kernel memory, an out-of-type read that can be leveraged for kernel-memory disclosure.\nI:H - Beyond the crash, the confused path can reach list_add_rcu(), writing a pointer into the mis-typed net_device object; type confusion is treated as a High integrity impact.\nA:H - The confusion produces a general protection fault / kernel oops (as reported by syzbot), reliably crashing the kernel."
}
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}
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