{
  "threat_severity" : "Low",
  "public_date" : "2024-03-18T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim()",
    "id" : "2270118",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2270118"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-20",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim()\nsyzbot pointed out [1] that NEXTHDR_FRAGMENT handling is broken.\nReading frag_off can only be done if we pulled enough bytes\nto skb->head. Currently we might access garbage.\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\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---" ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-04-30T00:00:00Z",
    "advisory" : "RHSA-2024:2394",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-427.13.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-04-30T00:00:00Z",
    "advisory" : "RHSA-2024:2394",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-427.13.1.el9_4"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2024-26633\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26633\nhttps://lore.kernel.org/linux-cve-announce/20240318100758.2828621-16-lee@kernel.org/T" ],
  "name" : "CVE-2024-26633",
  "csaw" : false
}