CVE-2023-53635netfilter: conntrack: fix wrong ct->timeout value
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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 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.
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from a4b4766c3cebb4018167e06b863d8e95b7274757 before 80c5ba0078e20d926d11d0778f9a43902664ebf0; from a4b4766c3cebb4018167e06b863d8e95b7274757 before ff5e4ac8dd7be7f1faba955c5779a68571eeb0f8; from a4b4766c3cebb4018167e06b863d8e95b7274757 before f612ae1ab4793701caf39386fb3b7f4b3ef44e48; from a4b4766c3cebb4018167e06b863d8e95b7274757 before 73db1b8f2bb6725b7391e85aab41fdf592b3c0c1 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.4 before 6.1.28; from 6.2 before 6.2.15; from 6.3 before 6.3.2 | NVD |
References
- https://git.kernel.org/stable/c/80c5ba0078e20d926d11d0778f9a43902664ebf0patch
- https://git.kernel.org/stable/c/ff5e4ac8dd7be7f1faba955c5779a68571eeb0f8patch
- https://git.kernel.org/stable/c/f612ae1ab4793701caf39386fb3b7f4b3ef44e48patch
- https://git.kernel.org/stable/c/73db1b8f2bb6725b7391e85aab41fdf592b3c0c1patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.