CVE-2026-74735
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.
Affected versions
Linux kernel versions
3.16.60,
4.16.6,
4.17
and later are affected. Fixed in
7.1.10,
7.2
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-74735?
CVE-2026-74735 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.16.60 onward and has been patched in 7.1.10 and 7.2. CVE-2026-74735 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74735?
Yes. CVE-2026-74735 has been patched. Fixed versions include 7.1.10 and 7.2. If you are running Linux kernel 3.16.60 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74735 actively exploited?
No. CVE-2026-74735 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.