CVE-2026-74735

CVE CVE-2026-74735EUVD EUVD-2026-66565Published 2026-08-26T14:36:49.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: l2tp: fix tunnel and session refcount leak on seq_file release In pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state (pd->tunnel and pd->session) is kept in seq_file private data to allow iteration across multiple read() system calls. However, if userspace closes /proc/net/pppol2tp or /sys/kernel/debug/l2tp/tunnels before reading to end-of-file (EOF), any tunnel or session reference stored in pd->tunnel / pd->session is left un-dropped when seq_file private data is freed. Fix this by dropping any remaining pd->tunnel and pd->session references in pppol2tp_proc_release() and l2tp_dfs_seq_release() when closing the file.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.1.10; 4.16.6 <4.17; c712ed63e9b33d9a282fbd92ce25c64918c3129f; 7f8e401f9e612df2a95c1ef76217c00181389bb5; patch: 7.2; 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 <9006c116dd111d457bf5d074990210f70a4ad2c8; 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 <ebe2774e956482dd3c70b8991f6f7654356339e6; 3.16.60 <3.17; 4.17; f6104e9ae04462523c372928b1173766a771ef95; 9a8863e8a8def9d88583cd9c60db38a008e6b8cf; patch: 0

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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