GHSA-V8V9-WQ25-MFFX
Vulnerability from github – Published: 2025-10-07 18:31 – Updated: 2026-02-04 00:30In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: fix wrong ct->timeout value
(struct nf_conn)->timeout is an interval before the conntrack confirmed. After confirmed, it becomes a timestamp.
It is observed that timeout of an unconfirmed conntrack:
- Set by calling ctnetlink_change_timeout(). As a result,
nfct_time_stamp was wrongly added to ct->timeout twice.
- Get by calling ctnetlink_dump_timeout(). As a result,
nfct_time_stamp was wrongly subtracted.
Call Trace: dump_stack_lvl ctnetlink_dump_timeout __ctnetlink_glue_build ctnetlink_glue_build __nfqnl_enqueue_packet nf_queue nf_hook_slow ip_mc_output ? __pfx_ip_finish_output ip_send_skb ? __pfx_dst_output udp_send_skb udp_sendmsg ? __pfx_ip_generic_getfrag sock_sendmsg
Separate the 2 cases in:
- Setting ct->timeout in __nf_ct_set_timeout().
- Getting ct->timeout in ctnetlink_dump_timeout().
Pablo appends:
Update ctnetlink to set up the timeout after the IPS_CONFIRMED flag is set on, otherwise conntrack creation via ctnetlink breaks.
Note that the problem described in this patch occurs since the introduction of the nfnetlink_queue conntrack support, select a sufficiently old Fixes: tag for -stable kernel to pick up this fix.
{
"affected": [],
"aliases": [
"CVE-2023-53635"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-07T16:15:46Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: fix wrong ct-\u003etimeout value\n\n(struct nf_conn)-\u003etimeout is an interval before the conntrack\nconfirmed. After confirmed, it becomes a timestamp.\n\nIt is observed that timeout of an unconfirmed conntrack:\n- Set by calling ctnetlink_change_timeout(). As a result,\n `nfct_time_stamp` was wrongly added to `ct-\u003etimeout` twice.\n- Get by calling ctnetlink_dump_timeout(). As a result,\n `nfct_time_stamp` was wrongly subtracted.\n\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl\n ctnetlink_dump_timeout\n __ctnetlink_glue_build\n ctnetlink_glue_build\n __nfqnl_enqueue_packet\n nf_queue\n nf_hook_slow\n ip_mc_output\n ? __pfx_ip_finish_output\n ip_send_skb\n ? __pfx_dst_output\n udp_send_skb\n udp_sendmsg\n ? __pfx_ip_generic_getfrag\n sock_sendmsg\n\nSeparate the 2 cases in:\n- Setting `ct-\u003etimeout` in __nf_ct_set_timeout().\n- Getting `ct-\u003etimeout` in ctnetlink_dump_timeout().\n\nPablo appends:\n\nUpdate ctnetlink to set up the timeout _after_ the IPS_CONFIRMED flag is\nset on, otherwise conntrack creation via ctnetlink breaks.\n\nNote that the problem described in this patch occurs since the\nintroduction of the nfnetlink_queue conntrack support, select a\nsufficiently old Fixes: tag for -stable kernel to pick up this fix.",
"id": "GHSA-v8v9-wq25-mffx",
"modified": "2026-02-04T00:30:27Z",
"published": "2025-10-07T18:31:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53635"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/73db1b8f2bb6725b7391e85aab41fdf592b3c0c1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/80c5ba0078e20d926d11d0778f9a43902664ebf0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f612ae1ab4793701caf39386fb3b7f4b3ef44e48"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ff5e4ac8dd7be7f1faba955c5779a68571eeb0f8"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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