CVE-2025-38568 net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing
A stack out-of-bounds write in the Linux kernel's mqprio scheduler allows attackers to potentially execute code or escalate privileges via crafted traffic control entries.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-38568?
CVE-2025-38568 is a high-severity memory corruption vulnerability in Linux kernel, published on 19 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2025-38568?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-38568?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-38568 being exploited?
There is no known exploitation of CVE-2025-38568 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-66503, BELL-CVE-2025-38568, DEBIAN-CVE-2025-38568, GHSA-4rpm-cvm4-wfmq, ROOT-OS-DEBIAN-13-CVE-2025-38568, ROOT-OS-UBUNTU-2404-CVE-2025-38568 and 1 more.