CVE-2024-27396: net: gtp: Fix Use-After-Free in gtp_dellink

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-14 · updated 2026-10-15
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: net: gtp: Fix Use-After-Free in gtp_dellink Since call_rcu, which is called in the hlist_for_each_entry_rcu traversal of gtp_dellink, is not part of the RCU read critical section, it is possible that the RCU grace period will pass during the traversal and the key will be free. To prevent this, it should be changed to hlist_for_each_entry_safe.

Affected products

Debian Linux: 10.0
Linux kernel: from 4.14.162 before 4.15; from 4.19.93 before 4.19.313; from 5.4.8 before 5.4.275; from 5.5 before 5.10.216; from 5.11 before 5.15.158; from 5.16 before 6.1.90 — fixed in 4.15, 4.19.313, 5.10.216, 5.15.158, 5.4.275, 6.1.90

How to fix

Upgrade to a fixed version: Linux kernel 4.15, 4.19.313, 5.10.216, 5.15.158. Check the vendor advisory for mitigations.

References

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