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CVE-2025-68252: misc: fastrpc: Fix dma_buf object leak in fastrpc_map_lookup

• 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: 2025-12-16 · updated 2026-10-14

Description

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix dma_buf object leak in fastrpc_map_lookup In fastrpc_map_lookup, dma_buf_get is called to obtain a reference to the dma_buf for comparison purposes. However, this reference is never released when the function returns, leading to a dma_buf memory leak. Fix this by adding dma_buf_put before returning from the function, ensuring that the temporarily acquired reference is properly released regardless of whether a matching map is found. Rule: add

Affected products

• Linux kernel: from 6.1.156 before 6.1.158; from 6.6.112 before 6.6.115; from 6.12.53 before 6.12.56; from 6.17.3 before 6.17.6 — fixed in 6.1.158, 6.12.56, 6.17.6, 6.6.115

How to fix

Upgrade to a fixed version: Linux kernel 6.1.158, 6.12.56, 6.17.6, 6.6.115. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/214e81a63a9aa0be42382ef0365ba5ed32c513ab
• https://git.kernel.org/stable/c/9a297a68c3ba4a7ecb31ed52f61bd6634abb79d3
• https://git.kernel.org/stable/c/c2fef5ebb73f3dabae6fbc571d181914ed32c483
• https://git.kernel.org/stable/c/e17b13387827adce7acb19ac0f07f9bcafe0ff4c
• https://git.kernel.org/stable/c/fff111bf45cbeeb659324316d68554e35d350092

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