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CVE-2024-26633

Vulnérabilité moyenne dans Linux (Linux)

CVSS 5.5 · Moyenne
EPSS 0.3%
Linux•Linux•Versions : <=6.1.*, 72bbf335e7aad09c88c50dbdd238f4faabd12174, <62a1fedeb14c7ac0947ef33fadbabd35ed2400a2, 3.10.106, 3.12.71, 5.15.148, <3.13, <3.11, <3f15ba3dc14e6ee002ea01b4faddc3d49200377c, 0, a6f6bb6bc04a5f88a31f47a6123d3fbf5ee8d694, 3.18.49, 6.6.14, <4.10, <d375b98e0248980681e5e56b712026174d617198, fbfa743a9d2a0ffa24251764f10afc13eb21e739, 6.8, <3.3, 6.1.75, 4.4.50, 5.4.268, <=5.10.*, <=6.6.*, d3d9b59ab32160e3cc4edcf7e5fa7cecb53a7d25, 4.10, 4.9.11, <da23bd709b46168f7dfc36055801011222b076cd, a7fe4e5d06338e1a82b1977eca37400951f99730, <4.5, d397f7035d2c754781bbe93b07b94d8cd898620c, <4329426cf6b8e22b798db2331c7ef1dd2a9c748d, <=5.4.*, decccc92ee0a978a1c268b5df16824cb6384ed3c, <=4.19.*, 3.2.87, 6.7.2, 41e07a7e01d951cfd4c9a7dac90c921269d89513, <=*, <ba8d904c274268b18ef3dc11d3ca7b24a96cb087, <=5.15.*, 3.16.42, 5.10.209, <=6.7.*, <3.17, <3.19, <687c5d52fe53e602e76826dbd4d7af412747e183, 4.19.306, <135414f300c5db995e2a2f3bf0f455de9d014aee

Description

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---

Gravité et risque d'exploitation

CVE-2024-26633 obtient un score CVSS de 5.5/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.33 %, ce qui la place devant 24.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 72bbf335e7aad09c88c50dbdd238f4faabd12174, <62a1fedeb14c7ac0947ef33fadbabd35ed2400a2, 3.10.106, 3.12.71, 5.15.148, <3.13, <3.11, <3f15ba3dc14e6ee002ea01b4faddc3d49200377c, 0, a6f6bb6bc04a5f88a31f47a6123d3fbf5ee8d694, 3.18.49, 6.6.14, <4.10, <d375b98e0248980681e5e56b712026174d617198, fbfa743a9d2a0ffa24251764f10afc13eb21e739, 6.8, <3.3, 6.1.75, 4.4.50, 5.4.268, <=5.10.*, <=6.6.*, d3d9b59ab32160e3cc4edcf7e5fa7cecb53a7d25, 4.10, 4.9.11, <da23bd709b46168f7dfc36055801011222b076cd, a7fe4e5d06338e1a82b1977eca37400951f99730, <4.5, d397f7035d2c754781bbe93b07b94d8cd898620c, <4329426cf6b8e22b798db2331c7ef1dd2a9c748d, <=5.4.*, decccc92ee0a978a1c268b5df16824cb6384ed3c, <=4.19.*, 3.2.87, 6.7.2, 41e07a7e01d951cfd4c9a7dac90c921269d89513, <=*, <ba8d904c274268b18ef3dc11d3ca7b24a96cb087, <=5.15.*, 3.16.42, 5.10.209, <=6.7.*, <3.17, <3.19, <687c5d52fe53e602e76826dbd4d7af412747e183, 4.19.306, <135414f300c5db995e2a2f3bf0f455de9d014aee) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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