CVE-2026-74735

Not scored yetLast modified Oct 21, 2026

Description

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.

Metrics

No CVSS score has been published yet.

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443, < bd897e414451fb34dfdf08b31899180e5ab7149b; >= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443, < bdf83613781956cc39798ed08321f74ab0467f4d; >= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443, < 8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500; >= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443, < ebe2774e956482dd3c70b8991f6f7654356339e6; >= 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443, < 9006c116dd111d457bf5d074990210f70a4ad2c8; f6104e9ae04462523c372928b1173766a771ef95; 7f8e401f9e612df2a95c1ef76217c00181389bb5; c712ed63e9b33d9a282fbd92ce25c64918c3129f; 9a8863e8a8def9d88583cd9c60db38a008e6b8cf; >= 3.16.60, < 3.17; >= 4.16.6, < 4.17
LinuxLinux4.17

References

Timeline

Published
Aug 26, 2026
Last modified
Oct 21, 2026
NVD status
Received

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