CVE-2026-74735l2tp: fix tunnel and session refcount leak on seq_file release
Updated under an hour ago ()
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 before bdf83613781956cc39798ed08321f74ab0467f4d; from 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 before 8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500; from 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 before ebe2774e956482dd3c70b8991f6f7654356339e6; from 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 before 9006c116dd111d457bf5d074990210f70a4ad2c8; f6104e9ae04462523c372928b1173766a771ef95; 7f8e401f9e612df2a95c1ef76217c00181389bb5; c712ed63e9b33d9a282fbd92ce25c64918c3129f; 9a8863e8a8def9d88583cd9c60db38a008e6b8cf; and 2 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/bdf83613781956cc39798ed08321f74ab0467f4d
- https://git.kernel.org/stable/c/8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500
- https://git.kernel.org/stable/c/ebe2774e956482dd3c70b8991f6f7654356339e6
- https://git.kernel.org/stable/c/9006c116dd111d457bf5d074990210f70a4ad2c8
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.