GHSA-v8v9-wq25-mffx

Опубликовано: 07 окт. 2025

Источник: github

Github: Не прошло ревью

CVSS3: 5.5

Описание

In 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 _a...

In 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.

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.

Ссылки

EPSS

Процентиль: 3%

0.00017

Низкий

5.5 Medium

CVSS3

CVE ID

CVE-2023-53635

Связанные уязвимости

CVE-2023-53635

CVSS3: 5.5

ubuntu

4 месяца назад

In 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: <TASK> 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 fla...