GHSA-X29V-26MM-796J

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ebtables: terminate table name before find_table_lock()

update_counters() and compat_update_counters() forward a user-supplied 32-byte table name to find_table_lock() without NUL-terminating it. On a lookup miss, find_inlist_lock() calls try_then_request_module(..., "%s%s", "ebtable_", name), and vsnprintf() reads past the name field and the stack object until it hits a zero byte.

BUG: KASAN: stack-out-of-bounds in string (lib/vsprintf.c:648 lib/vsprintf.c:730) Read of size 1 at addr ffff8880119dfb20 by task exploit/147 Call Trace: ... string (lib/vsprintf.c:648 lib/vsprintf.c:730) vsnprintf (lib/vsprintf.c:2945) __request_module (kernel/module/kmod.c:150) do_update_counters.isra.0 (net/bridge/netfilter/ebtables.c:371 net/bridge/netfilter/ebtables.c:380) update_counters (net/bridge/netfilter/ebtables.c:1440) do_ebt_set_ctl (net/bridge/netfilter/ebtables.c:2573) nf_setsockopt (net/netfilter/nf_sockopt.c:101) ip_setsockopt (net/ipv4/ip_sockglue.c:1424) raw_setsockopt (net/ipv4/raw.c:847) __sys_setsockopt (net/socket.c:2393) ...

compat_do_replace() shares the same unterminated name via compat_copy_ebt_replace_from_user(); terminate it there too so all find_table_lock() callers behave alike. The other callers already terminate the name after the copy.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-64411"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:24Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: terminate table name before find_table_lock()\n\nupdate_counters() and compat_update_counters() forward a user-supplied\n32-byte table name to find_table_lock() without NUL-terminating it. On a\nlookup miss, find_inlist_lock() calls try_then_request_module(..., \"%s%s\",\n\"ebtable_\", name), and vsnprintf() reads past the name field and the\nstack object until it hits a zero byte.\n\n  BUG: KASAN: stack-out-of-bounds in string (lib/vsprintf.c:648 lib/vsprintf.c:730)\n  Read of size 1 at addr ffff8880119dfb20 by task exploit/147\n  Call Trace:\n  ...\n   string (lib/vsprintf.c:648 lib/vsprintf.c:730)\n   vsnprintf (lib/vsprintf.c:2945)\n   __request_module (kernel/module/kmod.c:150)\n   do_update_counters.isra.0 (net/bridge/netfilter/ebtables.c:371 net/bridge/netfilter/ebtables.c:380)\n   update_counters (net/bridge/netfilter/ebtables.c:1440)\n   do_ebt_set_ctl (net/bridge/netfilter/ebtables.c:2573)\n   nf_setsockopt (net/netfilter/nf_sockopt.c:101)\n   ip_setsockopt (net/ipv4/ip_sockglue.c:1424)\n   raw_setsockopt (net/ipv4/raw.c:847)\n   __sys_setsockopt (net/socket.c:2393)\n  ...\n\ncompat_do_replace() shares the same unterminated name via\ncompat_copy_ebt_replace_from_user(); terminate it there too so all\nfind_table_lock() callers behave alike. The other callers already\nterminate the name after the copy.",
  "id": "GHSA-x29v-26mm-796j",
  "modified": "2026-07-27T06:30:36Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64411"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2664f537ca5bcb2ef3fac2683dcca602e51fad24"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c046ca4e35a83ea32f6e748f54139f5fe2a1d01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fe8d3cecd20bfaaaf440db3a06ba674d2f2e322"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7436da6c1bc44654b7f11a17e746f6999fd37250"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a622d2e9608c9dff47fc2e5759ac7aa3a836b45d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab63ccefb9c71627f957a0724c2b9ebc869c6f20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6183b1b88a722b6d8ea0cecc99eba168a15e0be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6f539311e58e76aa96feef0f1572b13a564f8a2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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