CVE-2026-74735
- Source
- https://cve.org/CVERecord?id=CVE-2026-74735
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74735.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-74735
- Downstream
- Published
- 2026-08-26T14:36:49Z
- Modified
- 2026-10-08T02:51:57Z
- Summary
- l2tp: fix tunnel and session refcount leak on seq_file release
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74735.json" }- References
-
- https://git.kernel.org/stable/c/8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500
- https://git.kernel.org/stable/c/9006c116dd111d457bf5d074990210f70a4ad2c8
- https://git.kernel.org/stable/c/bdf83613781956cc39798ed08321f74ab0467f4d
- https://git.kernel.org/stable/c/ebe2774e956482dd3c70b8991f6f7654356339e6
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74735.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-74735
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443Fixedbdf83613781956cc39798ed08321f74ab0467f4dFixed8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500Fixedebe2774e956482dd3c70b8991f6f7654356339e6Fixed9006c116dd111d457bf5d074990210f70a4ad2c8
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3.16.60Fixed3.17
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4.16.6Fixed4.17
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf6104e9ae04462523c372928b1173766a771ef95
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced7f8e401f9e612df2a95c1ef76217c00181389bb5
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedc712ed63e9b33d9a282fbd92ce25c64918c3129f
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9a8863e8a8def9d88583cd9c60db38a008e6b8cf
Affected versions
v3.*
v3.16.60
v3.16.61
v3.16.62
v3.16.63
v3.16.64
v3.16.65
v3.16.66
v3.16.67
v3.16.68
v3.16.69
v3.16.70
v3.16.71
v3.16.72
v3.16.73
v3.16.74
v3.16.75
v3.16.76
v3.16.77
v3.16.78
v3.16.79
v3.16.80
v3.16.81
v3.16.82
v3.16.83
v3.16.84
v3.16.85
v4.*
v4.16.10
v4.16.11
v4.16.12
v4.16.13
v4.16.14
v4.16.15
v4.16.16
v4.16.17
v4.16.18
v4.16.6
v4.16.7
v4.16.8
v4.16.9