CVE-2024-35939: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: dma-direct: Leak pages on dma_set_decrypted() failure On TDX it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. DMA could free decrypted/shared pages if dma_set_decrypted() fails. This should be a rare case. Just leak the pages in this case instead of freeing them.

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CVSS v3.1 Score

7.1

HIGH

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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 6.1.86
linux	linux_kernel	6.2 — 6.6.27
linux	linux_kernel	6.7 — 6.8.6

References

Advisories & Patches

https://git.kernel.org/stable/c/4031b72ca747a1e6e9ae4fa729e765b43363d66a https://git.kernel.org/stable/c/4e0cfb25d49da2e6261ad582f58ffa5b5dd8c8e9 https://git.kernel.org/stable/c/b57326c96b7bc7638aa8c44e12afa2defe0c934c https://git.kernel.org/stable/c/b9fa16949d18e06bdf728a560f5c8af56d2bdcaf https://git.kernel.org/stable/c/4031b72ca747a1e6e9ae4fa729e765b43363d66a https://git.kernel.org/stable/c/4e0cfb25d49da2e6261ad582f58ffa5b5dd8c8e9 https://git.kernel.org/stable/c/b57326c96b7bc7638aa8c44e12afa2defe0c934c https://git.kernel.org/stable/c/b9fa16949d18e06bdf728a560f5c8af56d2bdcaf

Frequently Asked Questions

What is CVE-2024-35939? +

In the Linux kernel, the following vulnerability has been resolved: dma-direct: Leak pages on dma_set_decrypted() failure On TDX it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. DMA could free decrypted/shared pages if dma_set_decrypted() fails. This should be a rare case. Just leak the pages in this case instead of freeing them. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2024-35939? +

CVE-2024-35939 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-35939? +

CVE-2024-35939 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-2024-35939? +

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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