{"id":"DEBIAN-CVE-2023-54243","details":"In the Linux kernel, the following vulnerability has been resolved:  netfilter: ebtables: fix table blob use-after-free  We are not allowed to return an error at this point. Looking at the code it looks like ret is always 0 at this point, but its not.  t = find_table_lock(net, repl-\u003ename, &ret, &ebt_mutex);  ... this can return a valid table, with ret != 0.  This bug causes update of table-\u003eprivate with the new blob, but then frees the blob right away in the caller.  Syzbot report:  BUG: KASAN: vmalloc-out-of-bounds in __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168 Read of size 4 at addr ffffc90005425000 by task kworker/u4:4/74 Workqueue: netns cleanup_net Call Trace:  kasan_report+0xbf/0x1f0 mm/kasan/report.c:517  __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168  ebt_unregister_table+0x35/0x40 net/bridge/netfilter/ebtables.c:1372  ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169  cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613 ...  ip(6)tables appears to be ok (ret should be 0 at this point) but make this more obvious.","modified":"2026-09-15T09:02:47.601210571Z","published":"2025-12-30T13:16:12.880Z","upstream":["CVE-2023-54243"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-54243"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54243.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54243.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.20-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-54243.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:H/I:H/A:H"}]}