What’s Vulnerable › Vulnerabilities

CVE-2025-68744: bpf: Free special fields when update [lru_,]percpu_hash maps

• Severity: unknown
• 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: 2025-12-24 · updated 2026-10-13

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Free special fields when update [lru_,]percpu_hash maps As [lru_,]percpu_hash maps support BPF_KPTR_{REF,PERCPU}, missing calls to 'bpf_obj_free_fields()' in 'pcpu_copy_value()' could cause the memory referenced by BPF_KPTR_{REF,PERCPU} fields to be held until the map gets freed. Fix this by calling 'bpf_obj_free_fields()' after 'copy_map_value[,_long]()' in 'pcpu_copy_value()'.

Affected products

• Linux kernel: 6.4 — fixed in 6.19

How to fix

Upgrade to a fixed version: Linux kernel 6.19. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3bf1378747e251571e0de15e7e0a6bf2919044e7
• https://git.kernel.org/stable/c/4a03d69cece145e4fb527464be29c3806aa3221e
• https://git.kernel.org/stable/c/6af6e49a76c9af7d42eb923703e7648cb2bf401a
• https://git.kernel.org/stable/c/96a5cb7072cabbac5c66ac9318242c3bdceebb68
• https://git.kernel.org/stable/c/994d6303ed0b84cbc795bb5becf7ed6de40d3f3c

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