405 lines
23 KiB
JSON
405 lines
23 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-26882",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.185Z",
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"datePublished": "2024-04-17T10:27:38.389Z",
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"dateUpdated": "2026-10-15T00:39:04.046Z"
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},
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"containers": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:28:07.358Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip_tunnel: make sure to pull inner header in ip_tunnel_rcv()\n\nApply the same fix than ones found in :\n\n8d975c15c0cd (\"ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()\")\n1ca1ba465e55 (\"geneve: make sure to pull inner header in geneve_rx()\")\n\nWe have to save skb->network_header in a temporary variable\nin order to be able to recompute the network_header pointer\nafter a pskb_inet_may_pull() call.\n\npskb_inet_may_pull() makes sure the needed headers are in skb->head.\n\nsyzbot reported:\nBUG: 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 IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline]\n BUG: KMSAN: uninit-value in ip_tunnel_rcv+0xed9/0x2ed0 net/ipv4/ip_tunnel.c:409\n __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\n INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\n IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline]\n ip_tunnel_rcv+0xed9/0x2ed0 net/ipv4/ip_tunnel.c:409\n __ipgre_rcv+0x9bc/0xbc0 net/ipv4/ip_gre.c:389\n ipgre_rcv net/ipv4/ip_gre.c:411 [inline]\n gre_rcv+0x423/0x19f0 net/ipv4/ip_gre.c:447\n gre_rcv+0x2a4/0x390 net/ipv4/gre_demux.c:163\n ip_protocol_deliver_rcu+0x264/0x1300 net/ipv4/ip_input.c:205\n ip_local_deliver_finish+0x2b8/0x440 net/ipv4/ip_input.c:233\n NF_HOOK include/linux/netfilter.h:314 [inline]\n ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254\n dst_input include/net/dst.h:461 [inline]\n ip_rcv_finish net/ipv4/ip_input.c:449 [inline]\n NF_HOOK include/linux/netfilter.h:314 [inline]\n ip_rcv+0x46f/0x760 net/ipv4/ip_input.c:569\n __netif_receive_skb_one_core net/core/dev.c:5534 [inline]\n __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5648\n netif_receive_skb_internal net/core/dev.c:5734 [inline]\n netif_receive_skb+0x58/0x660 net/core/dev.c:5793\n tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1556\n tun_get_user+0x53b9/0x66e0 drivers/net/tun.c:2009\n tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2055\n call_write_iter include/linux/fs.h:2087 [inline]\n new_sync_write fs/read_write.c:497 [inline]\n vfs_write+0xb6b/0x1520 fs/read_write.c:590\n ksys_write+0x20f/0x4c0 fs/read_write.c:643\n __do_sys_write fs/read_write.c:655 [inline]\n __se_sys_write fs/read_write.c:652 [inline]\n __x64_sys_write+0x93/0xd0 fs/read_write.c:652\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nUninit was created at:\n __alloc_pages+0x9a6/0xe00 mm/page_alloc.c:4590\n alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133\n alloc_pages+0x1be/0x1e0 mm/mempolicy.c:2204\n skb_page_frag_refill+0x2bf/0x7c0 net/core/sock.c:2909\n tun_build_skb drivers/net/tun.c:1686 [inline]\n tun_get_user+0xe0a/0x66e0 drivers/net/tun.c:1826\n tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2055\n call_write_iter include/linux/fs.h:2087 [inline]\n new_sync_write fs/read_write.c:497 [inline]\n vfs_write+0xb6b/0x1520 fs/read_write.c:590\n ksys_write+0x20f/0x4c0 fs/read_write.c:643\n __do_sys_write fs/read_write.c:655 [inline]\n __se_sys_write fs/read_write.c:652 [inline]\n __x64_sys_write+0x93/0xd0 fs/read_write.c:652\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
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"baseScore": 7.3,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The vulnerable code runs in the GRE/gretap/ERSPAN/ipip/sit decapsulation receive path (`gre_rcv` → `__ipgre_rcv` → `ip_tunnel_rcv`), processing IP protocol 47/4/41 packets routed from anywhere on the internet. A remote attacker produces the required non-linear skb deterministically by IP-fragmenting the tunnel packet so reassembly leaves the linear area ending at the inner network header.\nAC:L - The attacker fully controls the packet layout: `pskb_may_pull()`/`__pskb_pull_tail()` pull exactly the requested bytes, so a chosen fragment split reliably leaves zero linear bytes at the inner header on every packet, and for gretap/ERSPAN the `pskb_may_pull(ETH_HLEN)` in `__iptunnel_pull_header()` lands the boundary automatically.\nPR:N - GRE and IPIP/SIT have no authentication whatsoever, and `ip_tunnel_lookup()` has wildcard-remote, collect_md and fallback-device passes that match packets from any source address, so no account or credentials on the target are required.\nUI:N - Decapsulation happens automatically in softirq context on packet receipt; no action by any local user or administrator is needed beyond the tunnel already being configured and up.\nS:U - The uninitialized read and the resulting mis-handled packet stay entirely within the kernel's own security authority; no VM, IOMMU, container or sandbox boundary is crossed.\nC:L - One to two bytes of uninitialized/stale kernel memory past `skb_tail_pointer()` (heap padding or `skb_shared_info` bytes) are read, and their low ECN bits are inferable by the attacker from whether the tunneled packet is delivered or dropped — a real but strictly bounded, low-bandwidth disclosure oracle rather than arbitrary memory read.\nI:L - No out-of-bounds write is reachable because `INET_ECN_set_ce()`/`INET_ECN_set_ect1()` bounds-check against the tail pointer, but the RFC 6040 decapsulation decision — whether the congestion (CE) signal is propagated to the inner packet and whether the frame is accepted — is driven by uninitialized memory, corrupting the ECN state of legitimate decapsulated traffic.\nA:L - The read always stays inside the skb head allocation (`skb_shared_info` follows `skb->end`), so no oops or panic is reachable on a production kernel; the effect is that legitimate tunneled packets are non-deterministically dropped via the `err > 1` path (`rx_frame_errors`/`rx_errors`), degrading the tunnel rather than the host."
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}
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]
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}
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{
|
|
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
|
|
"tags": [
|
|
"x_transferred"
|
|
]
|
|
},
|
|
{
|
|
"url": "https://security.netapp.com/advisory/ntap-20241220-0002/"
|
|
}
|
|
],
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2024-12-20T13:06:43.371Z"
|
|
}
|
|
},
|
|
{
|
|
"x_adpType": "supplier",
|
|
"providerMetadata": {
|
|
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
|
|
"shortName": "siemens-SADP",
|
|
"dateUpdated": "2026-10-15T00:39:04.046Z"
|
|
},
|
|
"affected": [
|
|
{
|
|
"vendor": "Siemens",
|
|
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
|
|
"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "0",
|
|
"lessThan": "V1.1.1",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
},
|
|
"dataVersion": "5.2"
|
|
} |