{"cve":"CVE-2026-23072","nvd":{"published":"2026-02-04T17:16:17.923","modified":"2026-06-17T10:20:48.840","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: Fix memleak in l2tp_udp_encap_recv().\n\nsyzbot reported memleak of struct l2tp_session, l2tp_tunnel,\nsock, etc. [0]\n\nThe cited commit moved down the validation of the protocol\nversion in l2tp_udp_encap_recv().\n\nThe new place requires an extra error handling to avoid the\nmemleak.\n\nLet's call l2tp_session_put() there.\n\n[0]:\nBUG: memory leak\nunreferenced object 0xffff88810a290200 (size 512):\n  comm \"syz.0.17\", pid 6086, jiffies 4294944299\n  hex dump (first 32 bytes):\n    7d eb 04 0c 00 00 00 00 01 00 00 00 00 00 00 00  }...............\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc babb6a4f):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n    slab_post_alloc_hook mm/slub.c:4958 [inline]\n    slab_alloc_node mm/slub.c:5263 [inline]\n    __do_kmalloc_node mm/slub.c:5656 [inline]\n    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669\n    kmalloc_noprof include/linux/slab.h:961 [inline]\n    kzalloc_noprof include/linux/slab.h:1094 [inline]\n    l2tp_session_create+0x3a/0x3b0 net/l2tp/l2tp_core.c:1778\n    pppol2tp_connect+0x48b/0x920 net/l2tp/l2tp_ppp.c:755\n    __sys_connect_file+0x7a/0xb0 net/socket.c:2089\n    __sys_connect+0xde/0x110 net/socket.c:2108\n    __do_sys_connect net/socket.c:2114 [inline]\n    __se_sys_connect net/socket.c:2111 [inline]\n    __x64_sys_connect+0x1c/0x30 net/socket.c:2111\n    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-401"],"references":["https://git.kernel.org/stable/c/4d10edfd1475b69dbd4c47f34b61a3772ece83ca","https://git.kernel.org/stable/c/5cd158a88eef34e7b100cd9b963873d3b4e41b35","https://git.kernel.org/stable/c/d4ce79e6dce2a4a49eebceea7b4caf5dc0f0ef3d"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-23072","score":0.00145,"percentile":0.03719,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}