GHSA-X29V-26MM-796J
Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-09-08 09:35In 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.
{
"affected": [],
"aliases": [
"CVE-2026-64411"
],
"database_specific": {
"cwe_ids": [
"CWE-125"
],
"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": "2026-09-08T09:35:35Z",
"published": "2026-07-25T12:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64411"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"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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