Answer in brief
CVE-2026-74735 records a Unknown severity vulnerability in l2tp: fix tunnel and session refcount leak on seq_file release. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 4.17 | Not reported |
| Linux/Linuxgeneric | >=0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 <bdf83613781956cc39798ed08321f74ab0467f4d || >=0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 <8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500 || >=0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 <ebe2774e956482dd3c70b8991f6f7654356339e6 || >=0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 <9006c116dd111d457bf5d074990210f70a4ad2c8 || f6104e9ae04462523c372928b1173766a771ef95 || 7f8e401f9e612df2a95c1ef76217c00181389bb5 || c712ed63e9b33d9a282fbd92ce25c64918c3129f || 9a8863e8a8def9d88583cd9c60db38a008e6b8cf || >=3.16.60 <3.17 || >=4.16.6 <4.17 | bdf83613781956cc39798ed08321f74ab0467f4d, 8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500, ebe2774e956482dd3c70b8991f6f7654356339e6, 9006c116dd111d457bf5d074990210f70a4ad2c8, 3.17, 4.17 |
| Linux/Linuxgeneric | >=0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 <ebe2774e956482dd3c70b8991f6f7654356339e6 || >=0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 <9006c116dd111d457bf5d074990210f70a4ad2c8 || f6104e9ae04462523c372928b1173766a771ef95 || 7f8e401f9e612df2a95c1ef76217c00181389bb5 || c712ed63e9b33d9a282fbd92ce25c64918c3129f || 9a8863e8a8def9d88583cd9c60db38a008e6b8cf || >=3.16.60 <3.17 || >=4.16.6 <4.17 | ebe2774e956482dd3c70b8991f6f7654356339e6, 9006c116dd111d457bf5d074990210f70a4ad2c8, 3.17, 4.17 |
Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.