CVE-2026-74496 (GCVE-0-2026-74496)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-10-16 19:05
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fou: Fix use-after-free in fou_create() fou_create() publishes struct fou through sk_user_data before adding the new FOU port to the per-netns list. If fou_add_to_port_list() fails, the error path frees fou while it is still reachable through sk_user_data. A concurrent receive can then dereference the freed object in fou_from_sock(). This ordering issue was previously noted in the linked discussion. The failure is reachable when local port 0 is requested. Each socket binds to a different ephemeral port, but fou_cfg_cmp() compares the requested port 0 and reports -EALREADY once an entry already exists. Release the tunnel socket before freeing fou so sk_user_data is cleared first, and defer reclamation with kfree_rcu() to protect concurrent RCU readers. This matches the lifetime handling in fou_release().
References
Impacted products
Vendor Product Version
Linux Linux Version: 23461551c00628c3f3fe9cf837bf53cf8f212b63
Version: 23461551c00628c3f3fe9cf837bf53cf8f212b63
Version: 23461551c00628c3f3fe9cf837bf53cf8f212b63
Version: 23461551c00628c3f3fe9cf837bf53cf8f212b63
Version: 23461551c00628c3f3fe9cf837bf53cf8f212b63
Version: 23461551c00628c3f3fe9cf837bf53cf8f212b63
Version: 23461551c00628c3f3fe9cf837bf53cf8f212b63
Version: 23461551c00628c3f3fe9cf837bf53cf8f212b63
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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.