CVE-2026-74496

CVE CVE-2026-74496EUVD EUVD-2026-59689Published 2026-08-15T12:27:23.000ZLast changed 2026-08-17T05:47:51.000ZCVSS 7.8

What the advisory describes

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().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 23461551c00628c3f3fe9cf837bf53cf8f212b63 <b14361aca6350ff7907b0e9903c7b94dc7d5d4a0; 3.18; patch: 0; patch: 7.2; patch: 7.1.8; 23461551c00628c3f3fe9cf837bf53cf8f212b63 <a28d8903bfe76089ea4bbdbff9976965f9ef8107

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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