{"id":"DEBIAN-CVE-2023-53635","details":"In the Linux kernel, the following vulnerability has been resolved:  netfilter: conntrack: fix wrong ct-\u003etimeout value  (struct nf_conn)-\u003etimeout 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-\u003etimeout` twice. - Get by calling ctnetlink_dump_timeout(). As a result,   `nfct_time_stamp` was wrongly subtracted.  Call Trace:  \u003cTASK\u003e  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-\u003etimeout` in __nf_ct_set_timeout(). - Getting `ct-\u003etimeout` 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.","modified":"2026-09-15T09:02:51.949062726Z","published":"2025-10-07T16:15:46.643Z","upstream":["CVE-2023-53635"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53635"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.37-1"}]}],"versions":["6.1.27-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53635.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.3.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53635.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.3.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53635.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}