CVE-2024-40940: linux kernel Double Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix tainted pointer delete is case of flow rules creation fail In case of flow rule creation fail in mlx5_lag_create_port_sel_table(), instead of previously created rules, the tainted pointer is deleted deveral times. Fix this bug by using correct flow rules pointers. Found by Linux Verification Center (linuxtesting.org) with SVACE.

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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	5.19 — 6.1.95
linux	linux_kernel	6.2 — 6.6.35
linux	linux_kernel	6.7 — 6.9.6
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/229bedbf62b13af5aba6525ad10b62ad38d9ccb5 https://git.kernel.org/stable/c/531eab2da27dd42d68dfb841d82e987f4a6738b8 https://git.kernel.org/stable/c/a03a3fa12769e25f4385bee587afe1445aee7f7a https://git.kernel.org/stable/c/d857df86837ac1c30592e8a068204d16feac9930 https://git.kernel.org/stable/c/229bedbf62b13af5aba6525ad10b62ad38d9ccb5 https://git.kernel.org/stable/c/531eab2da27dd42d68dfb841d82e987f4a6738b8 https://git.kernel.org/stable/c/a03a3fa12769e25f4385bee587afe1445aee7f7a https://git.kernel.org/stable/c/d857df86837ac1c30592e8a068204d16feac9930

Other References

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-40940? +

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix tainted pointer delete is case of flow rules creation fail In case of flow rule creation fail in mlx5_lag_create_port_sel_table(), instead of previously created rules, the tainted pointer is deleted deveral times. Fix this bug by using correct flow rules pointers. Found by Linux Verification Center (linuxtesting.org) with SVACE. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-40940? +

CVE-2024-40940 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-2024-40940? +

CVE-2024-40940 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-40940? +

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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