CVE-2024-26641 (GCVE-0-2024-26641)

Vulnerability from cvelistv5 – Published: 2024-03-18 10:19 – Updated: 2026-08-05 11:26
VLAI
Title
ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()
Summary
In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv() syzbot found __ip6_tnl_rcv() could access unitiliazed data [1]. Call pskb_inet_may_pull() to fix this, and initialize ipv6h variable after this call as it can change skb->head. [1] BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline] BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline] BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321 __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline] INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline] IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321 ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727 __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845 ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888 gre_rcv+0x143f/0x1870 ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438 ip6_input_finish net/ipv6/ip6_input.c:483 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492 ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586 dst_input include/net/dst.h:461 [inline] ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:314 [inline] ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5532 [inline] __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5646 netif_receive_skb_internal net/core/dev.c:5732 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5791 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555 tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2084 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x786/0x1200 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xd0 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x6d/0x140 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+0x5e9/0xb10 mm/slub.c:3523 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560 __alloc_skb+0x318/0x740 net/core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334 sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787 tun_alloc_skb drivers/net/tun.c:1531 [inline] tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2084 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x786/0x1200 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xd0 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 5034 Comm: syz-executor331 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-21 16:08 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0d3c703a9d1723c7707e0680019ac8ff5922db42 , < a9bc32879a08f23cdb80a48c738017e39aea1080 (git)
Affected: 0d3c703a9d1723c7707e0680019ac8ff5922db42 , < af6b5c50d47ab43e5272ad61935d0ed2e264d3f0 (git)
Affected: 0d3c703a9d1723c7707e0680019ac8ff5922db42 , < d54e4da98bbfa8c257bdca94c49652d81d18a4d8 (git)
Affected: 0d3c703a9d1723c7707e0680019ac8ff5922db42 , < 350a6640fac4b53564ec20aa3f4a0922cb0ba5e6 (git)
Affected: 0d3c703a9d1723c7707e0680019ac8ff5922db42 , < c835df3bcc14858ae9b27315dd7de76370b94f3a (git)
Affected: 0d3c703a9d1723c7707e0680019ac8ff5922db42 , < 8d975c15c0cd744000ca386247432d57b21f9df0 (git)
Create a notification for this product.
Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.210 , ≤ 5.10.* (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.77 , ≤ 6.1.* (semver)
Unaffected: 6.6.16 , ≤ 6.6.* (semver)
Unaffected: 6.7.4 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()\n\nsyzbot found __ip6_tnl_rcv() could access unitiliazed data [1].\n\nCall pskb_inet_may_pull() to fix this, and initialize ipv6h\nvariable after this call as it can change skb-\u003ehead.\n\n[1]\n BUG: 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 IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\n  __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\n  INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\n  IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\n  ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727\n  __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845\n  ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888\n gre_rcv+0x143f/0x1870\n  ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438\n  ip6_input_finish net/ipv6/ip6_input.c:483 [inline]\n  NF_HOOK include/linux/netfilter.h:314 [inline]\n  ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492\n  ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586\n  dst_input include/net/dst.h:461 [inline]\n  ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79\n  NF_HOOK include/linux/netfilter.h:314 [inline]\n  ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310\n  __netif_receive_skb_one_core net/core/dev.c:5532 [inline]\n  __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5646\n  netif_receive_skb_internal net/core/dev.c:5732 [inline]\n  netif_receive_skb+0x58/0x660 net/core/dev.c:5791\n  tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555\n  tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\n  call_write_iter include/linux/fs.h:2084 [inline]\n  new_sync_write fs/read_write.c:497 [inline]\n  vfs_write+0x786/0x1200 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+0x6d/0x140 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nUninit was created at:\n  slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768\n  slab_alloc_node mm/slub.c:3478 [inline]\n  kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560\n  __alloc_skb+0x318/0x740 net/core/skbuff.c:651\n  alloc_skb include/linux/skbuff.h:1286 [inline]\n  alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334\n  sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787\n  tun_alloc_skb drivers/net/tun.c:1531 [inline]\n  tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\n  call_write_iter include/linux/fs.h:2084 [inline]\n  new_sync_write fs/read_write.c:497 [inline]\n  vfs_write+0x786/0x1200 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+0x6d/0x140 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nCPU: 0 PID: 5034 Comm: syz-executor331 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023"
        }
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      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is in the IPv6 tunnel receive path, reached directly from `ipv6_rcv()` \u2192 `ip6_protocol_deliver_rcu()` \u2192 `gre_rcv()`/`ip6ip6_rcv()`/`ip4ip6_rcv()` when a host has an ip6tnl, ip6gre, ERSPAN or collect_md tunnel endpoint configured. A remote attacker triggers it purely by sending a crafted IPv6 packet (proto 47/41/4/137) with a truncated inner header.\nAC:L - The attacker fully controls the packet: simply emitting an outer IPv6+GRE header with zero/short inner payload deterministically reaches `dscp_ecn_decapsulate()` with the inner header absent from the linear area. No race, no memory-layout grooming, and no condition outside the attacker\u0027s control is required.\nPR:N - Tunnel decapsulation is completely unauthenticated \u2014 `ip6_tnl_rcv_ctl()`/`ip6_tnl_lookup()` only compare addresses and keys, and wildcard, `collect_md` and fallback tunnels match arbitrary sources. The attacker needs no account or credentials on the target.\nUI:N - Processing happens automatically in softirq context when the packet is received; no local user has to open, mount, or click anything.\nS:U - The uninitialized read and the out-of-bounds DSCP write are confined to kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:L - KMSAN confirms uninitialized kernel heap memory is read and consumed by `__INET_ECN_decapsulate()`, and the outcome is remotely observable (packet dropped vs. delivered, plus the ratelimited \"non-ECT from %pI6 with DS=%#x\" log), giving a repeatable oracle over stale heap contents. The exposure is strictly bounded to a couple of bytes within the skb\u0027s own buffer rather than an arbitrary read.\nI:L - On tunnels configured with `IP6_TNL_F_RCV_DSCP_COPY`, `ipv6_change_dsfield()`/`ipv4_change_dsfield()` perform an unchecked read-modify-write beyond the packet data (unlike the bounds-checked `INET_ECN_set_ce()`), modifying kernel memory that does not belong to the packet \u2014 in the zero-tailroom case the first bytes of `struct skb_shared_info`. The corruption is a few bytes at a fixed offset, not an arbitrary write.\nA:H - The unchecked DSCP write can land on `skb_shared_info`\u0027s `meta_len` and `frag_list` pointer bytes, corrupting a kernel pointer that is later dereferenced during skb traversal/free, yielding an oops; garbage-driven ECN decisions additionally cause spurious `rx_frame_errors` drops of tunnel traffic, and the condition is a hard KMSAN/instrumented-kernel abort. Any unauthenticated remote peer can repeat it indefinitely."
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      "providerMetadata": {
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          "url": "https://git.kernel.org/stable/c/8d975c15c0cd744000ca386247432d57b21f9df0"
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      "title": "ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26641",
    "datePublished": "2024-03-18T10:19:07.581Z",
    "dateReserved": "2024-02-19T14:20:24.137Z",
    "dateUpdated": "2026-08-05T11:26:29.008Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-26641",
      "date": "2026-08-13",
      "epss": "0.00573",
      "percentile": "0.44398"
    },
    "fkie_nvd": {
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()\\n\\nsyzbot found __ip6_tnl_rcv() could access unitiliazed data [1].\\n\\nCall pskb_inet_may_pull() to fix this, and initialize ipv6h\\nvariable after this call as it can change skb-\u003ehead.\\n\\n[1]\\n BUG: 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 IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\\n  __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\\n  INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\\n  IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\\n  ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727\\n  __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845\\n  ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888\\n gre_rcv+0x143f/0x1870\\n  ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438\\n  ip6_input_finish net/ipv6/ip6_input.c:483 [inline]\\n  NF_HOOK include/linux/netfilter.h:314 [inline]\\n  ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492\\n  ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586\\n  dst_input include/net/dst.h:461 [inline]\\n  ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79\\n  NF_HOOK include/linux/netfilter.h:314 [inline]\\n  ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310\\n  __netif_receive_skb_one_core net/core/dev.c:5532 [inline]\\n  __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5646\\n  netif_receive_skb_internal net/core/dev.c:5732 [inline]\\n  netif_receive_skb+0x58/0x660 net/core/dev.c:5791\\n  tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555\\n  tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002\\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\\n  call_write_iter include/linux/fs.h:2084 [inline]\\n  new_sync_write fs/read_write.c:497 [inline]\\n  vfs_write+0x786/0x1200 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+0x6d/0x140 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nUninit was created at:\\n  slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768\\n  slab_alloc_node mm/slub.c:3478 [inline]\\n  kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523\\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560\\n  __alloc_skb+0x318/0x740 net/core/skbuff.c:651\\n  alloc_skb include/linux/skbuff.h:1286 [inline]\\n  alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334\\n  sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787\\n  tun_alloc_skb drivers/net/tun.c:1531 [inline]\\n  tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846\\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\\n  call_write_iter include/linux/fs.h:2084 [inline]\\n  new_sync_write fs/read_write.c:497 [inline]\\n  vfs_write+0x786/0x1200 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+0x6d/0x140 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nCPU: 0 PID: 5034 Comm: syz-executor331 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: ip6_tunnel: aseg\\u00farese de extraer el encabezado interno en __ip6_tnl_rcv(). El syzbot encontr\\u00f3 que __ip6_tnl_rcv() pod\\u00eda acceder a datos unificados [1]. Llame a pskb_inet_may_pull() para solucionar este problema e inicialice la variable ipv6h despu\\u00e9s de esta llamada, ya que puede cambiar skb-\u0026gt;head. [1] ERROR: KMSAN: valor uninit en __INET_ECN_decapsulate include/net/inet_ecn.h:253 [en l\\u00ednea] ERROR: KMSAN: valor uninit en INET_ECN_decapsulate include/net/inet_ecn.h:275 [en l\\u00ednea] ERROR: KMSAN: uninit -valor en IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321 __INET_ECN_decapsulate include/net/inet_ecn.h:253 [en l\\u00ednea] INET_ECN_decapsulate include/net/inet_ecn.h:275 [en l\\u00ednea] IP6_ECN_decapsulate+0x7df/0x1e50 include/ net/inet_ecn.h:321 ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727 __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845 ip6_tnl_rcv+0xce/0x100 net/ipv 6/ip6_tunnel.c:888 gre_rcv +0x143f/0x1870 ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438 ip6_input_finish net/ipv6/ip6_input.c:483 [en l\\u00ednea] NF_HOOK include/linux/netfilter.h:314 [en l\\u00ednea] ip6_input+0x15d/0x 430 netos /ipv6/ip6_input.c:492 ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586 dst_input include/net/dst.h:461 [en l\\u00ednea] ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:314 [en l\\u00ednea] ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5532 [en l\\u00ednea] __netif_receive_skb+0x1a6/0x5a0 net/core/dev. c:5646 netif_receive_skb_internal net/core/dev.c:5732 [en l\\u00ednea] netif_receive_skb+0x58/0x660 net/core/dev.c:5791 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555 tun_get_user+0x53af/0x66d0 drivers /net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2084 [en l\\u00ednea] new_sync_write fs/read_write.c:497 [en l\\u00ednea] vfs_write+0x786/ 0x1200 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [en l\\u00ednea] __se_sys_write fs/read_write.c:652 [en l\\u00ednea] __x64_sys_write+0x93/0xd0 fs/read _escribir .c:652 do_syscall_x64 arch/x86/entry/common.c:52 [en l\\u00ednea] do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit se cre\\u00f3 en: slab_post_alloc_hook+0x129/0xa 70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [en l\\u00ednea] kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560 __alloc_skb+0x318/0x740 net /core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1286 [en l\\u00ednea] alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334 sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787 tun_alloc_skb drivers/net/tun.c:1531 [en l\\u00ednea] tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2084 [en l\\u00ednea] new_sync_write fs/read_write.c:497 [en l\\u00ednea] vfs_write+0x786/0x1200 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [en l\\u00ednea] __se_sys_write fs/read_write.c:652 [en l\\u00ednea] __x64_sys_write+0x93/0xd0 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:52 [en l\\u00ednea] do_syscall_64+0x6d/0x140 arch/x86/entry/common. c:83 Entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 5034 Comm: syz-executor331 No contaminado 6.7.0-syzkaller-00562-g9f8413c4a66f #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/ 2023\"}]",
      "id": "CVE-2024-26641",
      "lastModified": "2024-11-21T09:02:44.853",
      "published": "2024-03-18T11:15:11.193",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/350a6640fac4b53564ec20aa3f4a0922cb0ba5e6\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/8d975c15c0cd744000ca386247432d57b21f9df0\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/a9bc32879a08f23cdb80a48c738017e39aea1080\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/af6b5c50d47ab43e5272ad61935d0ed2e264d3f0\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/c835df3bcc14858ae9b27315dd7de76370b94f3a\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/d54e4da98bbfa8c257bdca94c49652d81d18a4d8\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/350a6640fac4b53564ec20aa3f4a0922cb0ba5e6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/8d975c15c0cd744000ca386247432d57b21f9df0\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/a9bc32879a08f23cdb80a48c738017e39aea1080\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/af6b5c50d47ab43e5272ad61935d0ed2e264d3f0\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/c835df3bcc14858ae9b27315dd7de76370b94f3a\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/d54e4da98bbfa8c257bdca94c49652d81d18a4d8\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20241108-0008/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26641\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-18T11:15:11.193\",\"lastModified\":\"2026-08-04T11:16:52.303\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()\\n\\nsyzbot found __ip6_tnl_rcv() could access unitiliazed data [1].\\n\\nCall pskb_inet_may_pull() to fix this, and initialize ipv6h\\nvariable after this call as it can change skb-\u003ehead.\\n\\n[1]\\n BUG: 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 IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\\n  __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\\n  INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\\n  IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\\n  ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727\\n  __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845\\n  ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888\\n gre_rcv+0x143f/0x1870\\n  ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438\\n  ip6_input_finish net/ipv6/ip6_input.c:483 [inline]\\n  NF_HOOK include/linux/netfilter.h:314 [inline]\\n  ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492\\n  ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586\\n  dst_input include/net/dst.h:461 [inline]\\n  ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79\\n  NF_HOOK include/linux/netfilter.h:314 [inline]\\n  ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310\\n  __netif_receive_skb_one_core net/core/dev.c:5532 [inline]\\n  __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5646\\n  netif_receive_skb_internal net/core/dev.c:5732 [inline]\\n  netif_receive_skb+0x58/0x660 net/core/dev.c:5791\\n  tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555\\n  tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002\\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\\n  call_write_iter include/linux/fs.h:2084 [inline]\\n  new_sync_write fs/read_write.c:497 [inline]\\n  vfs_write+0x786/0x1200 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+0x6d/0x140 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nUninit was created at:\\n  slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768\\n  slab_alloc_node mm/slub.c:3478 [inline]\\n  kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523\\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560\\n  __alloc_skb+0x318/0x740 net/core/skbuff.c:651\\n  alloc_skb include/linux/skbuff.h:1286 [inline]\\n  alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334\\n  sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787\\n  tun_alloc_skb drivers/net/tun.c:1531 [inline]\\n  tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846\\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\\n  call_write_iter include/linux/fs.h:2084 [inline]\\n  new_sync_write fs/read_write.c:497 [inline]\\n  vfs_write+0x786/0x1200 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+0x6d/0x140 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nCPU: 0 PID: 5034 Comm: syz-executor331 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ip6_tunnel: aseg\u00farese de extraer el encabezado interno en __ip6_tnl_rcv(). El syzbot encontr\u00f3 que __ip6_tnl_rcv() pod\u00eda acceder a datos unificados [1]. Llame a pskb_inet_may_pull() para solucionar este problema e inicialice la variable ipv6h despu\u00e9s de esta llamada, ya que puede cambiar skb-\u0026gt;head. [1] ERROR: KMSAN: valor uninit en __INET_ECN_decapsulate include/net/inet_ecn.h:253 [en l\u00ednea] ERROR: KMSAN: valor uninit en INET_ECN_decapsulate include/net/inet_ecn.h:275 [en l\u00ednea] ERROR: KMSAN: uninit -valor en IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321 __INET_ECN_decapsulate include/net/inet_ecn.h:253 [en l\u00ednea] INET_ECN_decapsulate include/net/inet_ecn.h:275 [en l\u00ednea] IP6_ECN_decapsulate+0x7df/0x1e50 include/ net/inet_ecn.h:321 ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727 __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845 ip6_tnl_rcv+0xce/0x100 net/ipv 6/ip6_tunnel.c:888 gre_rcv +0x143f/0x1870 ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438 ip6_input_finish net/ipv6/ip6_input.c:483 [en l\u00ednea] NF_HOOK include/linux/netfilter.h:314 [en l\u00ednea] ip6_input+0x15d/0x 430 netos /ipv6/ip6_input.c:492 ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586 dst_input include/net/dst.h:461 [en l\u00ednea] ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:314 [en l\u00ednea] ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5532 [en l\u00ednea] __netif_receive_skb+0x1a6/0x5a0 net/core/dev. c:5646 netif_receive_skb_internal net/core/dev.c:5732 [en l\u00ednea] netif_receive_skb+0x58/0x660 net/core/dev.c:5791 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555 tun_get_user+0x53af/0x66d0 drivers /net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2084 [en l\u00ednea] new_sync_write fs/read_write.c:497 [en l\u00ednea] vfs_write+0x786/ 0x1200 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [en l\u00ednea] __se_sys_write fs/read_write.c:652 [en l\u00ednea] __x64_sys_write+0x93/0xd0 fs/read _escribir .c:652 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit se cre\u00f3 en: slab_post_alloc_hook+0x129/0xa 70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [en l\u00ednea] kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560 __alloc_skb+0x318/0x740 net /core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1286 [en l\u00ednea] alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334 sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787 tun_alloc_skb drivers/net/tun.c:1531 [en l\u00ednea] tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2084 [en l\u00ednea] new_sync_write fs/read_write.c:497 [en l\u00ednea] vfs_write+0x786/0x1200 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [en l\u00ednea] __se_sys_write fs/read_write.c:652 [en l\u00ednea] __x64_sys_write+0x93/0xd0 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0x6d/0x140 arch/x86/entry/common. c:83 Entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 5034 Comm: syz-executor331 No contaminado 6.7.0-syzkaller-00562-g9f8413c4a66f #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/ 2023\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/ip6_tunnel.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0d3c703a9d1723c7707e0680019ac8ff5922db42\",\"lessThan\":\"a9bc32879a08f23cdb80a48c738017e39aea1080\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0d3c703a9d1723c7707e0680019ac8ff5922db42\",\"lessThan\":\"af6b5c50d47ab43e5272ad61935d0ed2e264d3f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0d3c703a9d1723c7707e0680019ac8ff5922db42\",\"lessThan\":\"d54e4da98bbfa8c257bdca94c49652d81d18a4d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0d3c703a9d1723c7707e0680019ac8ff5922db42\",\"lessThan\":\"350a6640fac4b53564ec20aa3f4a0922cb0ba5e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0d3c703a9d1723c7707e0680019ac8ff5922db42\",\"lessThan\":\"c835df3bcc14858ae9b27315dd7de76370b94f3a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0d3c703a9d1723c7707e0680019ac8ff5922db42\",\"lessThan\":\"8d975c15c0cd744000ca386247432d57b21f9df0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/ip6_tunnel.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.210\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.149\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.77\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.16\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.7.4\",\"lessThanOrEqual\":\"6.7.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H\",\"baseScore\":8.6,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.7},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-06-21T16:08:53.324454Z\",\"id\":\"CVE-2024-26641\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:52:08+00:00",
      "cve": "CVE-2024-26641",
      "id": "CVE-2024-26641",
      "initial_release_date": "2024-03-18T00:00:00+00:00",
      "product_status:fixed": "280",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "8",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26641.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-05T01:01:39Z",
      "cve": "CVE-2024-26641",
      "id": "CVE-2024-26641",
      "initial_release_date": "2024-03-20T03:48:13Z",
      "product_status:known_affected": "567",
      "product_status:known_not_affected": "66",
      "product_status:recommended": "726",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26641",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26641.json",
      "version": "98"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a9bc32879a08f23cdb80a48c738017e39aea1080\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/af6b5c50d47ab43e5272ad61935d0ed2e264d3f0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d54e4da98bbfa8c257bdca94c49652d81d18a4d8\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/350a6640fac4b53564ec20aa3f4a0922cb0ba5e6\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c835df3bcc14858ae9b27315dd7de76370b94f3a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/8d975c15c0cd744000ca386247432d57b21f9df0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20241108-0008/\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-11-08T15:02:48.742Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26641\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-21T16:08:53.324454Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-21T16:08:58.226Z\"}}], \"cna\": {\"title\": \"ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.6, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - The vulnerable code is in the IPv6 tunnel receive path, reached directly from `ipv6_rcv()` \\u2192 `ip6_protocol_deliver_rcu()` \\u2192 `gre_rcv()`/`ip6ip6_rcv()`/`ip4ip6_rcv()` when a host has an ip6tnl, ip6gre, ERSPAN or collect_md tunnel endpoint configured. A remote attacker triggers it purely by sending a crafted IPv6 packet (proto 47/41/4/137) with a truncated inner header.\\nAC:L - The attacker fully controls the packet: simply emitting an outer IPv6+GRE header with zero/short inner payload deterministically reaches `dscp_ecn_decapsulate()` with the inner header absent from the linear area. No race, no memory-layout grooming, and no condition outside the attacker\u0027s control is required.\\nPR:N - Tunnel decapsulation is completely unauthenticated \\u2014 `ip6_tnl_rcv_ctl()`/`ip6_tnl_lookup()` only compare addresses and keys, and wildcard, `collect_md` and fallback tunnels match arbitrary sources. The attacker needs no account or credentials on the target.\\nUI:N - Processing happens automatically in softirq context when the packet is received; no local user has to open, mount, or click anything.\\nS:U - The uninitialized read and the out-of-bounds DSCP write are confined to kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:L - KMSAN confirms uninitialized kernel heap memory is read and consumed by `__INET_ECN_decapsulate()`, and the outcome is remotely observable (packet dropped vs. delivered, plus the ratelimited \\\"non-ECT from %pI6 with DS=%#x\\\" log), giving a repeatable oracle over stale heap contents. The exposure is strictly bounded to a couple of bytes within the skb\u0027s own buffer rather than an arbitrary read.\\nI:L - On tunnels configured with `IP6_TNL_F_RCV_DSCP_COPY`, `ipv6_change_dsfield()`/`ipv4_change_dsfield()` perform an unchecked read-modify-write beyond the packet data (unlike the bounds-checked `INET_ECN_set_ce()`), modifying kernel memory that does not belong to the packet \\u2014 in the zero-tailroom case the first bytes of `struct skb_shared_info`. The corruption is a few bytes at a fixed offset, not an arbitrary write.\\nA:H - The unchecked DSCP write can land on `skb_shared_info`\u0027s `meta_len` and `frag_list` pointer bytes, corrupting a kernel pointer that is later dereferenced during skb traversal/free, yielding an oops; garbage-driven ECN decisions additionally cause spurious `rx_frame_errors` drops of tunnel traffic, and the condition is a hard KMSAN/instrumented-kernel abort. Any unauthenticated remote peer can repeat it indefinitely.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0d3c703a9d1723c7707e0680019ac8ff5922db42\", \"lessThan\": \"a9bc32879a08f23cdb80a48c738017e39aea1080\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d3c703a9d1723c7707e0680019ac8ff5922db42\", \"lessThan\": \"af6b5c50d47ab43e5272ad61935d0ed2e264d3f0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d3c703a9d1723c7707e0680019ac8ff5922db42\", \"lessThan\": \"d54e4da98bbfa8c257bdca94c49652d81d18a4d8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d3c703a9d1723c7707e0680019ac8ff5922db42\", \"lessThan\": \"350a6640fac4b53564ec20aa3f4a0922cb0ba5e6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d3c703a9d1723c7707e0680019ac8ff5922db42\", \"lessThan\": \"c835df3bcc14858ae9b27315dd7de76370b94f3a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0d3c703a9d1723c7707e0680019ac8ff5922db42\", \"lessThan\": \"8d975c15c0cd744000ca386247432d57b21f9df0\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv6/ip6_tunnel.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.210\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.149\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.77\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv6/ip6_tunnel.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a9bc32879a08f23cdb80a48c738017e39aea1080\"}, {\"url\": \"https://git.kernel.org/stable/c/af6b5c50d47ab43e5272ad61935d0ed2e264d3f0\"}, {\"url\": \"https://git.kernel.org/stable/c/d54e4da98bbfa8c257bdca94c49652d81d18a4d8\"}, {\"url\": \"https://git.kernel.org/stable/c/350a6640fac4b53564ec20aa3f4a0922cb0ba5e6\"}, {\"url\": \"https://git.kernel.org/stable/c/c835df3bcc14858ae9b27315dd7de76370b94f3a\"}, {\"url\": \"https://git.kernel.org/stable/c/8d975c15c0cd744000ca386247432d57b21f9df0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()\\n\\nsyzbot found __ip6_tnl_rcv() could access unitiliazed data [1].\\n\\nCall pskb_inet_may_pull() to fix this, and initialize ipv6h\\nvariable after this call as it can change skb-\u003ehead.\\n\\n[1]\\n BUG: 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 IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\\n  __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]\\n  INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]\\n  IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321\\n  ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727\\n  __ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845\\n  ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888\\n gre_rcv+0x143f/0x1870\\n  ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438\\n  ip6_input_finish net/ipv6/ip6_input.c:483 [inline]\\n  NF_HOOK include/linux/netfilter.h:314 [inline]\\n  ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492\\n  ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586\\n  dst_input include/net/dst.h:461 [inline]\\n  ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79\\n  NF_HOOK include/linux/netfilter.h:314 [inline]\\n  ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310\\n  __netif_receive_skb_one_core net/core/dev.c:5532 [inline]\\n  __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5646\\n  netif_receive_skb_internal net/core/dev.c:5732 [inline]\\n  netif_receive_skb+0x58/0x660 net/core/dev.c:5791\\n  tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555\\n  tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002\\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\\n  call_write_iter include/linux/fs.h:2084 [inline]\\n  new_sync_write fs/read_write.c:497 [inline]\\n  vfs_write+0x786/0x1200 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+0x6d/0x140 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nUninit was created at:\\n  slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768\\n  slab_alloc_node mm/slub.c:3478 [inline]\\n  kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523\\n  kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560\\n  __alloc_skb+0x318/0x740 net/core/skbuff.c:651\\n  alloc_skb include/linux/skbuff.h:1286 [inline]\\n  alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6334\\n  sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2787\\n  tun_alloc_skb drivers/net/tun.c:1531 [inline]\\n  tun_get_user+0x1e8a/0x66d0 drivers/net/tun.c:1846\\n  tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\\n  call_write_iter include/linux/fs.h:2084 [inline]\\n  new_sync_write fs/read_write.c:497 [inline]\\n  vfs_write+0x786/0x1200 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+0x6d/0x140 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nCPU: 0 PID: 5034 Comm: syz-executor331 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.210\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.149\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.77\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.16\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.4\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"4.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:26:29.008Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26641\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:26:29.008Z\", \"dateReserved\": \"2024-02-19T14:20:24.137Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-18T10:19:07.581Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.