CVE-2026-74735l2tp: fix tunnel and session refcount leak on seq_file release
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 88% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 – < c38b723858a51d6ca4e56470b9f1087f23276772
- affected 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 – < bd897e414451fb34dfdf08b31899180e5ab7149b
- affected 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 – < bdf83613781956cc39798ed08321f74ab0467f4d
- affected 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 – < 8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500
- affected 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 – < ebe2774e956482dd3c70b8991f6f7654356339e6
- affected 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 – < 9006c116dd111d457bf5d074990210f70a4ad2c8
- affected f6104e9ae04462523c372928b1173766a771ef95
- affected 7f8e401f9e612df2a95c1ef76217c00181389bb5
- affected c712ed63e9b33d9a282fbd92ce25c64918c3129f
- affected 9a8863e8a8def9d88583cd9c60db38a008e6b8cf
- affected 3.16.60 – < 3.17
- affected 4.16.6 – < 4.17
- affected 4.17
- unaffected < 4.17
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.1.10 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/c38b723858a51d6ca4e56470b9f1087f23276772 (opens in a new tab)
- https://git.kernel.org/stable/c/bd897e414451fb34dfdf08b31899180e5ab7149b (opens in a new tab)
- https://git.kernel.org/stable/c/bdf83613781956cc39798ed08321f74ab0467f4d (opens in a new tab)
- https://git.kernel.org/stable/c/8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500 (opens in a new tab)
- https://git.kernel.org/stable/c/ebe2774e956482dd3c70b8991f6f7654356339e6 (opens in a new tab)
- https://git.kernel.org/stable/c/9006c116dd111d457bf5d074990210f70a4ad2c8 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-66565 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-74735)Record last updated .