{"id":"DEBIAN-CVE-2026-23072","details":"In the Linux kernel, the following vulnerability has been resolved:  l2tp: Fix memleak in l2tp_udp_encap_recv().  syzbot reported memleak of struct l2tp_session, l2tp_tunnel, sock, etc. [0]  The cited commit moved down the validation of the protocol version in l2tp_udp_encap_recv().  The new place requires an extra error handling to avoid the memleak.  Let's call l2tp_session_put() there.  [0]: BUG: memory leak unreferenced object 0xffff88810a290200 (size 512):   comm \"syz.0.17\", pid 6086, jiffies 4294944299   hex dump (first 32 bytes):     7d eb 04 0c 00 00 00 00 01 00 00 00 00 00 00 00  }...............     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................   backtrace (crc babb6a4f):     kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]     slab_post_alloc_hook mm/slub.c:4958 [inline]     slab_alloc_node mm/slub.c:5263 [inline]     __do_kmalloc_node mm/slub.c:5656 [inline]     __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669     kmalloc_noprof include/linux/slab.h:961 [inline]     kzalloc_noprof include/linux/slab.h:1094 [inline]     l2tp_session_create+0x3a/0x3b0 net/l2tp/l2tp_core.c:1778     pppol2tp_connect+0x48b/0x920 net/l2tp/l2tp_ppp.c:755     __sys_connect_file+0x7a/0xb0 net/socket.c:2089     __sys_connect+0xde/0x110 net/socket.c:2108     __do_sys_connect net/socket.c:2114 [inline]     __se_sys_connect net/socket.c:2111 [inline]     __x64_sys_connect+0x1c/0x30 net/socket.c:2111     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]     do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94     entry_SYSCALL_64_after_hwframe+0x77/0x7f","modified":"2026-08-27T23:06:02.434684436Z","published":"2026-02-04T17:16:17.923Z","upstream":["CVE-2026-23072"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-23072"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.69-1"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23072.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.18.8-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23072.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"}]}