{"id":"CVE-2026-74735","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: fix tunnel and session refcount leak on seq_file release\n\nIn pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state\n(pd->tunnel and pd->session) is kept in…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: fix tunnel and session refcount leak on seq_file release\n\nIn pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state\n(pd->tunnel and pd->session) is kept in…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 < bdf83613781956cc39798ed08321f74ab0467f4d","Linux >= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 < 8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500","Linux >= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 < ebe2774e956482dd3c70b8991f6f7654356339e6","Linux >= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 < 9006c116dd111d457bf5d074990210f70a4ad2c8","Linux f6104e9ae04462523c372928b1173766a771ef95","Linux 7f8e401f9e612df2a95c1ef76217c00181389bb5","Linux c712ed63e9b33d9a282fbd92ce25c64918c3129f","Linux 9a8863e8a8def9d88583cd9c60db38a008e6b8cf","Linux >= 3.16.60 < 3.17","Linux >= 4.16.6 < 4.17","Linux 4.17"],"published":"2026-08-26","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:20.040","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74735","references":[{"url":"https://git.kernel.org/stable/c/8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9006c116dd111d457bf5d074990210f70a4ad2c8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bdf83613781956cc39798ed08321f74ab0467f4d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ebe2774e956482dd3c70b8991f6f7654356339e6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00175,"epssPercentile":0.073,"ingestedAt":"2026-09-21T13:37:22.838Z","slug":"CVE-2026-74735","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: fix tunnel and session refcount leak on seq_file release\n\nIn pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state\n(pd->tunnel and pd->session) is kept in seq_file private data to allow\niteration across multiple read() system calls.\n\nHowever, if userspace closes /proc/net/pppol2tp or /sys/kernel/debug/l2tp/tunnels\nbefore reading to end-of-file (EOF), any tunnel or session reference stored in\npd->tunnel / pd->session is left un-dropped when seq_file private data is freed.\n\nFix this by dropping any remaining pd->tunnel and pd->session references in\npppol2tp_proc_release() and l2tp_dfs_seq_release() when closing the file.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}