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CVE-2025-38568: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing

• 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: 2025-08-19 · updated 2026-07-30
• Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing TCA_MQPRIO_TC_ENTRY_INDEX is validated using NLA_POLICY_MAX(NLA_U32, TC_QOPT_MAX_QUEUE), which allows the value TC_QOPT_MAX_QUEUE (16). This leads to a 4-byte out-of-bounds stack write in the fp[] array, which only has room for 16 elements (0–15). Fix this by changing the policy to allow only up to TC_QOPT_MAX_QUEUE - 1.

Affected products

• Linux kernel: from 6.4 before 6.6.102; from 6.7 before 6.12.42; from 6.13 before 6.15.10; from 6.16 before 6.16.1 — fixed in 6.12.42, 6.15.10, 6.16.1, 6.6.102

How to fix

Upgrade to a fixed version: Linux kernel 6.12.42, 6.15.10, 6.16.1, 6.6.102. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/39491e859fd494d0b51adc5c7d54c8a7dcf1d198
• https://git.kernel.org/stable/c/66fc2ebdd9d5dd6e5a9c7edeace5a61a0ab2cd86
• https://git.kernel.org/stable/c/d00e4125680f7074c4f42ce3c297336f23128e70
• https://git.kernel.org/stable/c/f1a9dbcb7d17bf0abb325cdc984957cfabc59693
• https://git.kernel.org/stable/c/ffd2dc4c6c49ff4f1e5d34e454a6a55608104c17

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