CVE-2024-26633 (GCVE-0-2024-26633)
Vulnerability from cvelistv5
Published
2024-03-18 10:07
Modified
2026-05-23 15:36
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim() syzbot pointed out [1] that NEXTHDR_FRAGMENT handling is broken. Reading frag_off can only be done if we pulled enough bytes to skb->head. Currently we might access garbage. [1] BUG: KMSAN: uninit-value in ip6_tnl_parse_tlv_enc_lim+0x94f/0xbb0 ip6_tnl_parse_tlv_enc_lim+0x94f/0xbb0 ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1326 [inline] ip6_tnl_start_xmit+0xab2/0x1a70 net/ipv6/ip6_tunnel.c:1432 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3548 [inline] dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564 __dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349 dev_queue_xmit include/linux/netdevice.h:3134 [inline] neigh_connected_output+0x569/0x660 net/core/neighbour.c:1592 neigh_output include/net/neighbour.h:542 [inline] ip6_finish_output2+0x23a9/0x2b30 net/ipv6/ip6_output.c:137 ip6_finish_output+0x855/0x12b0 net/ipv6/ip6_output.c:222 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip6_output+0x323/0x610 net/ipv6/ip6_output.c:243 dst_output include/net/dst.h:451 [inline] ip6_local_out+0xe9/0x140 net/ipv6/output_core.c:155 ip6_send_skb net/ipv6/ip6_output.c:1952 [inline] ip6_push_pending_frames+0x1f9/0x560 net/ipv6/ip6_output.c:1972 rawv6_push_pending_frames+0xbe8/0xdf0 net/ipv6/raw.c:582 rawv6_sendmsg+0x2b66/0x2e70 net/ipv6/raw.c:920 inet_sendmsg+0x105/0x190 net/ipv4/af_inet.c:847 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638 __sys_sendmsg net/socket.c:2667 [inline] __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node_track_caller+0x118/0x3c0 mm/slab_common.c:1027 kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582 pskb_expand_head+0x226/0x1a00 net/core/skbuff.c:2098 __pskb_pull_tail+0x13b/0x2310 net/core/skbuff.c:2655 pskb_may_pull_reason include/linux/skbuff.h:2673 [inline] pskb_may_pull include/linux/skbuff.h:2681 [inline] ip6_tnl_parse_tlv_enc_lim+0x901/0xbb0 net/ipv6/ip6_tunnel.c:408 ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1326 [inline] ip6_tnl_start_xmit+0xab2/0x1a70 net/ipv6/ip6_tunnel.c:1432 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3548 [inline] dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564 __dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349 dev_queue_xmit include/linux/netdevice.h:3134 [inline] neigh_connected_output+0x569/0x660 net/core/neighbour.c:1592 neigh_output include/net/neighbour.h:542 [inline] ip6_finish_output2+0x23a9/0x2b30 net/ipv6/ip6_output.c:137 ip6_finish_output+0x855/0x12b0 net/ipv6/ip6_output.c:222 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip6_output+0x323/0x610 net/ipv6/ip6_output.c:243 dst_output include/net/dst.h:451 [inline] ip6_local_out+0xe9/0x140 net/ipv6/output_core.c:155 ip6_send_skb net/ipv6/ip6_output.c:1952 [inline] ip6_push_pending_frames+0x1f9/0x560 net/ipv6/ip6_output.c:1972 rawv6_push_pending_frames+0xbe8/0xdf0 net/ipv6/raw.c:582 rawv6_sendmsg+0x2b66/0x2e70 net/ipv6/raw.c:920 inet_sendmsg+0x105/0x190 net/ipv4/af_inet.c:847 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638 __sys_sendmsg net/socket.c:2667 [inline] __do_sys_sendms ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: fbfa743a9d2a0ffa24251764f10afc13eb21e739
Version: fbfa743a9d2a0ffa24251764f10afc13eb21e739
Version: fbfa743a9d2a0ffa24251764f10afc13eb21e739
Version: fbfa743a9d2a0ffa24251764f10afc13eb21e739
Version: fbfa743a9d2a0ffa24251764f10afc13eb21e739
Version: fbfa743a9d2a0ffa24251764f10afc13eb21e739
Version: fbfa743a9d2a0ffa24251764f10afc13eb21e739
Version: fbfa743a9d2a0ffa24251764f10afc13eb21e739
Version: a6f6bb6bc04a5f88a31f47a6123d3fbf5ee8d694
Version: 72bbf335e7aad09c88c50dbdd238f4faabd12174
Version: decccc92ee0a978a1c268b5df16824cb6384ed3c
Version: d3d9b59ab32160e3cc4edcf7e5fa7cecb53a7d25
Version: d397f7035d2c754781bbe93b07b94d8cd898620c
Version: 41e07a7e01d951cfd4c9a7dac90c921269d89513
Version: a7fe4e5d06338e1a82b1977eca37400951f99730
Version: 3.2.87   ≤
Version: 3.10.106   ≤
Version: 3.12.71   ≤
Version: 3.16.42   ≤
Version: 3.18.49   ≤
Version: 4.4.50   ≤
Version: 4.9.11   ≤
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim()\n\nsyzbot pointed out [1] that NEXTHDR_FRAGMENT handling is broken.\n\nReading frag_off can only be done if we pulled enough bytes\nto skb-\u003ehead. Currently we might access garbage.\n\n[1]\nBUG: KMSAN: uninit-value in ip6_tnl_parse_tlv_enc_lim+0x94f/0xbb0\nip6_tnl_parse_tlv_enc_lim+0x94f/0xbb0\nipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1326 [inline]\nip6_tnl_start_xmit+0xab2/0x1a70 net/ipv6/ip6_tunnel.c:1432\n__netdev_start_xmit include/linux/netdevice.h:4940 [inline]\nnetdev_start_xmit include/linux/netdevice.h:4954 [inline]\nxmit_one net/core/dev.c:3548 [inline]\ndev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564\n__dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349\ndev_queue_xmit include/linux/netdevice.h:3134 [inline]\nneigh_connected_output+0x569/0x660 net/core/neighbour.c:1592\nneigh_output include/net/neighbour.h:542 [inline]\nip6_finish_output2+0x23a9/0x2b30 net/ipv6/ip6_output.c:137\nip6_finish_output+0x855/0x12b0 net/ipv6/ip6_output.c:222\nNF_HOOK_COND include/linux/netfilter.h:303 [inline]\nip6_output+0x323/0x610 net/ipv6/ip6_output.c:243\ndst_output include/net/dst.h:451 [inline]\nip6_local_out+0xe9/0x140 net/ipv6/output_core.c:155\nip6_send_skb net/ipv6/ip6_output.c:1952 [inline]\nip6_push_pending_frames+0x1f9/0x560 net/ipv6/ip6_output.c:1972\nrawv6_push_pending_frames+0xbe8/0xdf0 net/ipv6/raw.c:582\nrawv6_sendmsg+0x2b66/0x2e70 net/ipv6/raw.c:920\ninet_sendmsg+0x105/0x190 net/ipv4/af_inet.c:847\nsock_sendmsg_nosec net/socket.c:730 [inline]\n__sock_sendmsg net/socket.c:745 [inline]\n____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584\n___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638\n__sys_sendmsg net/socket.c:2667 [inline]\n__do_sys_sendmsg net/socket.c:2676 [inline]\n__se_sys_sendmsg net/socket.c:2674 [inline]\n__x64_sys_sendmsg+0x307/0x490 net/socket.c:2674\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0x44/0x110 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nUninit was created at:\nslab_post_alloc_hook+0x129/0xa70 mm/slab.h:768\nslab_alloc_node mm/slub.c:3478 [inline]\n__kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517\n__do_kmalloc_node mm/slab_common.c:1006 [inline]\n__kmalloc_node_track_caller+0x118/0x3c0 mm/slab_common.c:1027\nkmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582\npskb_expand_head+0x226/0x1a00 net/core/skbuff.c:2098\n__pskb_pull_tail+0x13b/0x2310 net/core/skbuff.c:2655\npskb_may_pull_reason include/linux/skbuff.h:2673 [inline]\npskb_may_pull include/linux/skbuff.h:2681 [inline]\nip6_tnl_parse_tlv_enc_lim+0x901/0xbb0 net/ipv6/ip6_tunnel.c:408\nipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1326 [inline]\nip6_tnl_start_xmit+0xab2/0x1a70 net/ipv6/ip6_tunnel.c:1432\n__netdev_start_xmit include/linux/netdevice.h:4940 [inline]\nnetdev_start_xmit include/linux/netdevice.h:4954 [inline]\nxmit_one net/core/dev.c:3548 [inline]\ndev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564\n__dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349\ndev_queue_xmit include/linux/netdevice.h:3134 [inline]\nneigh_connected_output+0x569/0x660 net/core/neighbour.c:1592\nneigh_output include/net/neighbour.h:542 [inline]\nip6_finish_output2+0x23a9/0x2b30 net/ipv6/ip6_output.c:137\nip6_finish_output+0x855/0x12b0 net/ipv6/ip6_output.c:222\nNF_HOOK_COND include/linux/netfilter.h:303 [inline]\nip6_output+0x323/0x610 net/ipv6/ip6_output.c:243\ndst_output include/net/dst.h:451 [inline]\nip6_local_out+0xe9/0x140 net/ipv6/output_core.c:155\nip6_send_skb net/ipv6/ip6_output.c:1952 [inline]\nip6_push_pending_frames+0x1f9/0x560 net/ipv6/ip6_output.c:1972\nrawv6_push_pending_frames+0xbe8/0xdf0 net/ipv6/raw.c:582\nrawv6_sendmsg+0x2b66/0x2e70 net/ipv6/raw.c:920\ninet_sendmsg+0x105/0x190 net/ipv4/af_inet.c:847\nsock_sendmsg_nosec net/socket.c:730 [inline]\n__sock_sendmsg net/socket.c:745 [inline]\n____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584\n___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638\n__sys_sendmsg net/socket.c:2667 [inline]\n__do_sys_sendms\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:36:13.795Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/135414f300c5db995e2a2f3bf0f455de9d014aee"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f15ba3dc14e6ee002ea01b4faddc3d49200377c"
        },
        {
          "url": "https://git.kernel.org/stable/c/da23bd709b46168f7dfc36055801011222b076cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/4329426cf6b8e22b798db2331c7ef1dd2a9c748d"
        },
        {
          "url": "https://git.kernel.org/stable/c/62a1fedeb14c7ac0947ef33fadbabd35ed2400a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/687c5d52fe53e602e76826dbd4d7af412747e183"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba8d904c274268b18ef3dc11d3ca7b24a96cb087"
        },
        {
          "url": "https://git.kernel.org/stable/c/d375b98e0248980681e5e56b712026174d617198"
        }
      ],
      "title": "ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26633",
    "datePublished": "2024-03-18T10:07:49.468Z",
    "dateReserved": "2024-02-19T14:20:24.136Z",
    "dateUpdated": "2026-05-23T15:36:13.795Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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