CVE-2025-38313: debian linux Double Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: bus: fsl-mc: fix double-free on mc_dev The blamed commit tried to simplify how the deallocations are done but, in the process, introduced a double-free on the mc_dev variable. In case the MC device is a DPRC, a new mc_bus is allocated and the mc_dev variable is just a reference to one of its fields. In this circumstance, on the error path only the mc_bus should be freed. This commit introduces back the following checkpatch warning which is a false-positive. WARNING: kfree(NULL) is safe and this check is probably not required + if (mc_bus) + kfree(mc_bus);

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-415 CWE-415

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.13 — 5.4.295
linux	linux_kernel	5.5 — 5.10.239
linux	linux_kernel	5.11 — 5.15.186
linux	linux_kernel	5.16 — 6.1.142
linux	linux_kernel	6.2 — 6.6.94
linux	linux_kernel	6.7 — 6.12.34
linux	linux_kernel	6.13 — 6.15.3
debian	debian_linux	All

References

Advisories & Patches

https://git.kernel.org/stable/c/12e4431e5078847791936820bd39df9e1ee26d2e https://git.kernel.org/stable/c/1d5baab39e5b09a76870b345cdee7933871b881f https://git.kernel.org/stable/c/3135e03a92f6b5259d0a7f25f728e9e7866ede3f https://git.kernel.org/stable/c/4b23c46eb2d88924b93aca647bde9a4b9cf62cf9 https://git.kernel.org/stable/c/7002b954c4a8b9965ba0f139812ee4a6f71beac8 https://git.kernel.org/stable/c/873d47114fd5e5a1cad2018843671537cc71ac84 https://git.kernel.org/stable/c/b2057374f326303c86d8423415ab58656eebc695 https://git.kernel.org/stable/c/d694bf8a9acdbd061596f3e7549bc8cb70750a60

Other References

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

Frequently Asked Questions

What is CVE-2025-38313? +

In the Linux kernel, the following vulnerability has been resolved: bus: fsl-mc: fix double-free on mc_dev The blamed commit tried to simplify how the deallocations are done but, in the process, introduced a double-free on the mc_dev variable. In case the MC device is a DPRC, a new mc_bus is allocated and the mc_dev variable is just a reference to one of its fields. In this circumstance, on the error path only the mc_bus should be freed. This commit introduces back the following checkpatch warning which is a false-positive. WARNING: kfree(NULL) is safe and this check is probably not required + if (mc_bus) + kfree(mc_bus); It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-38313? +

CVE-2025-38313 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-38313? +

CVE-2025-38313 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-38313? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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