CVE-2025-22055 (GCVE-0-2025-22055)
Vulnerability from cvelistv5
Published
2025-04-16 14:12
Modified
2026-08-05 11:56
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix geneve_opt length integer overflow struct geneve_opt uses 5 bit length for each single option, which means every vary size option should be smaller than 128 bytes. However, all current related Netlink policies cannot promise this length condition and the attacker can exploit a exact 128-byte size option to *fake* a zero length option and confuse the parsing logic, further achieve heap out-of-bounds read. One example crash log is like below: [ 3.905425] ================================================================== [ 3.905925] BUG: KASAN: slab-out-of-bounds in nla_put+0xa9/0xe0 [ 3.906255] Read of size 124 at addr ffff888005f291cc by task poc/177 [ 3.906646] [ 3.906775] CPU: 0 PID: 177 Comm: poc-oob-read Not tainted 6.1.132 #1 [ 3.907131] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 3.907784] Call Trace: [ 3.907925] <TASK> [ 3.908048] dump_stack_lvl+0x44/0x5c [ 3.908258] print_report+0x184/0x4be [ 3.909151] kasan_report+0xc5/0x100 [ 3.909539] kasan_check_range+0xf3/0x1a0 [ 3.909794] memcpy+0x1f/0x60 [ 3.909968] nla_put+0xa9/0xe0 [ 3.910147] tunnel_key_dump+0x945/0xba0 [ 3.911536] tcf_action_dump_1+0x1c1/0x340 [ 3.912436] tcf_action_dump+0x101/0x180 [ 3.912689] tcf_exts_dump+0x164/0x1e0 [ 3.912905] fw_dump+0x18b/0x2d0 [ 3.913483] tcf_fill_node+0x2ee/0x460 [ 3.914778] tfilter_notify+0xf4/0x180 [ 3.915208] tc_new_tfilter+0xd51/0x10d0 [ 3.918615] rtnetlink_rcv_msg+0x4a2/0x560 [ 3.919118] netlink_rcv_skb+0xcd/0x200 [ 3.919787] netlink_unicast+0x395/0x530 [ 3.921032] netlink_sendmsg+0x3d0/0x6d0 [ 3.921987] __sock_sendmsg+0x99/0xa0 [ 3.922220] __sys_sendto+0x1b7/0x240 [ 3.922682] __x64_sys_sendto+0x72/0x90 [ 3.922906] do_syscall_64+0x5e/0x90 [ 3.923814] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 3.924122] RIP: 0033:0x7e83eab84407 [ 3.924331] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 faf [ 3.925330] RSP: 002b:00007ffff505e370 EFLAGS: 00000202 ORIG_RAX: 000000000000002c [ 3.925752] RAX: ffffffffffffffda RBX: 00007e83eaafa740 RCX: 00007e83eab84407 [ 3.926173] RDX: 00000000000001a8 RSI: 00007ffff505e3c0 RDI: 0000000000000003 [ 3.926587] RBP: 00007ffff505f460 R08: 00007e83eace1000 R09: 000000000000000c [ 3.926977] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffff505f3c0 [ 3.927367] R13: 00007ffff505f5c8 R14: 00007e83ead1b000 R15: 00005d4fbbe6dcb8 Fix these issues by enforing correct length condition in related policies.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0ed5269f9e41f495c8e9020c85f5e1644c1afc57
Version: 0ed5269f9e41f495c8e9020c85f5e1644c1afc57
Version: 0ed5269f9e41f495c8e9020c85f5e1644c1afc57
Version: 0ed5269f9e41f495c8e9020c85f5e1644c1afc57
Version: 0ed5269f9e41f495c8e9020c85f5e1644c1afc57
Version: 0ed5269f9e41f495c8e9020c85f5e1644c1afc57
Version: 0ed5269f9e41f495c8e9020c85f5e1644c1afc57
Version: 0ed5269f9e41f495c8e9020c85f5e1644c1afc57
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix geneve_opt length integer overflow\n\nstruct geneve_opt uses 5 bit length for each single option, which\nmeans every vary size option should be smaller than 128 bytes.\n\nHowever, all current related Netlink policies cannot promise this\nlength condition and the attacker can exploit a exact 128-byte size\noption to *fake* a zero length option and confuse the parsing logic,\nfurther achieve heap out-of-bounds read.\n\nOne example crash log is like below:\n\n[    3.905425] ==================================================================\n[    3.905925] BUG: KASAN: slab-out-of-bounds in nla_put+0xa9/0xe0\n[    3.906255] Read of size 124 at addr ffff888005f291cc by task poc/177\n[    3.906646]\n[    3.906775] CPU: 0 PID: 177 Comm: poc-oob-read Not tainted 6.1.132 #1\n[    3.907131] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\n[    3.907784] Call Trace:\n[    3.907925]  \u003cTASK\u003e\n[    3.908048]  dump_stack_lvl+0x44/0x5c\n[    3.908258]  print_report+0x184/0x4be\n[    3.909151]  kasan_report+0xc5/0x100\n[    3.909539]  kasan_check_range+0xf3/0x1a0\n[    3.909794]  memcpy+0x1f/0x60\n[    3.909968]  nla_put+0xa9/0xe0\n[    3.910147]  tunnel_key_dump+0x945/0xba0\n[    3.911536]  tcf_action_dump_1+0x1c1/0x340\n[    3.912436]  tcf_action_dump+0x101/0x180\n[    3.912689]  tcf_exts_dump+0x164/0x1e0\n[    3.912905]  fw_dump+0x18b/0x2d0\n[    3.913483]  tcf_fill_node+0x2ee/0x460\n[    3.914778]  tfilter_notify+0xf4/0x180\n[    3.915208]  tc_new_tfilter+0xd51/0x10d0\n[    3.918615]  rtnetlink_rcv_msg+0x4a2/0x560\n[    3.919118]  netlink_rcv_skb+0xcd/0x200\n[    3.919787]  netlink_unicast+0x395/0x530\n[    3.921032]  netlink_sendmsg+0x3d0/0x6d0\n[    3.921987]  __sock_sendmsg+0x99/0xa0\n[    3.922220]  __sys_sendto+0x1b7/0x240\n[    3.922682]  __x64_sys_sendto+0x72/0x90\n[    3.922906]  do_syscall_64+0x5e/0x90\n[    3.923814]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n[    3.924122] RIP: 0033:0x7e83eab84407\n[    3.924331] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 \u003c5b\u003e c3 0f 1f 80 00 00 00 00 83 e2 39 83 faf\n[    3.925330] RSP: 002b:00007ffff505e370 EFLAGS: 00000202 ORIG_RAX: 000000000000002c\n[    3.925752] RAX: ffffffffffffffda RBX: 00007e83eaafa740 RCX: 00007e83eab84407\n[    3.926173] RDX: 00000000000001a8 RSI: 00007ffff505e3c0 RDI: 0000000000000003\n[    3.926587] RBP: 00007ffff505f460 R08: 00007e83eace1000 R09: 000000000000000c\n[    3.926977] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffff505f3c0\n[    3.927367] R13: 00007ffff505f5c8 R14: 00007e83ead1b000 R15: 00005d4fbbe6dcb8\n\nFix these issues by enforing correct length condition in related\npolicies."
        }
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      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached by sending crafted rtnetlink/nfnetlink messages (tc filter/action, nftables tunnel object, or route lwtunnel encap) from a local socket, and the leaked data is returned in the netlink dump to the same local process. There is no remote packet path into the option-parsing or dump code.\nAC:L - The attacker fully controls both the malformed 128-byte option that fakes a zero length and the planted pseudo-header lengths inside the data, so the desynchronized walk and the resulting out-of-bounds read are deterministic and reproducible on every dump.\nPR:L - All entry points are gated only by namespace-relative CAP_NET_ADMIN (netlink_net_capable/ns_capable against net-\u003euser_ns), which any unprivileged local user obtains with `unshare -Urn`, and the required cls_flower/act_tunnel_key/nft_tunnel modules are autoloaded on demand.\nUI:N - The attacker installs the malformed geneve option and then dumps it back itself (tc filter show / nft list / ip route show); no action by any other user is needed.\nS:U - The out-of-bounds read stays within the kernel\u0027s own memory and the disclosed data is returned to the attacker through the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - Up to ~124 bytes of adjacent kernel heap memory per option are copied into the netlink reply and handed directly to the attacker, and the read offset is attacker-steerable and repeatable, so heap grooming yields disclosure of kernel pointers and neighboring slab object contents (KASLR defeat), far beyond a small bounded leak.\nI:N - The truncated length field only drives read sizes and walk offsets in the dump/offload paths; the option data itself is stored within correctly bounded buffers, and no path was found where the confusion produces an out-of-bounds or otherwise attacker-controlled write.\nA:H - The slab-out-of-bounds read is confirmed by the KASAN splat in the fix commit and can fault and oops the kernel when the over-read crosses into a KFENCE guard page or unmapped memory following the allocation, and it can be triggered repeatedly by an unprivileged user."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/5a2976cc4d9c36ff58a0f10e35ce4283cbaa9c0e"
        },
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      "title": "net: fix geneve_opt length integer overflow",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22055",
    "datePublished": "2025-04-16T14:12:12.595Z",
    "dateReserved": "2024-12-29T08:45:45.811Z",
    "dateUpdated": "2026-08-05T11:56:22.879Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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