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CVE-2026-74496

HIGHCVSS 7.8/10EPSS 0.13%

Last modified

CVE-2026-74496 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

Description

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().

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.13%

2.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 0ee628a58d83e571f36ec9f07624d6845e420c50; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < a6fca682cfa2041e31aa72cc397c4a1406eb7468; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < b3f9c3e60aa25453774f899d25b5e61dd0bec1d5; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 99f4d3120b244f92e5df787152041296a2860cb5; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 58835985c035a8333742f829ad7e0889a082f9d3; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < 9042867d4701728f0c6527215b11471759904d8f; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < a28d8903bfe76089ea4bbdbff9976965f9ef8107; >= 23461551c00628c3f3fe9cf837bf53cf8f212b63, < b14361aca6350ff7907b0e9903c7b94dc7d5d4a0
LinuxLinux3.18

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74496?
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().
How severe is CVE-2026-74496?
CVE-2026-74496 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74496?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST