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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-74735

l2tp: fix tunnel and session refcount leak on seq_file release

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 to < c38b723858a51d6ca4e56470b9f1087f23276772affected
  • 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 to < bd897e414451fb34dfdf08b31899180e5ab7149baffected
  • 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 to < bdf83613781956cc39798ed08321f74ab0467f4daffected
  • 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 to < 8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500affected
  • 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 to < ebe2774e956482dd3c70b8991f6f7654356339e6affected
  • 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 to < 9006c116dd111d457bf5d074990210f70a4ad2c8affected
  • f6104e9ae04462523c372928b1173766a771ef95affected
  • 7f8e401f9e612df2a95c1ef76217c00181389bb5affected
  • c712ed63e9b33d9a282fbd92ce25c64918c3129faffected
  • 9a8863e8a8def9d88583cd9c60db38a008e6b8cfaffected
  • 3.16.60 to < 3.17affected
  • 4.16.6 to < 4.17affected

Linux Linux

Default version status: affected

  • 4.17affected
  • 0 to < 4.17unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.111 to ≤ 6.12.*unaffected
  • 6.18.53 to ≤ 6.18.*unaffected
  • 7.1.10 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References