Linux Kernel up to 5.x/6.8-rc4 TLS net/tls/tls_sw.c put_page use after free

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.x/6.8-rc4. It has been declared as problematic. This vulnerability affects the function put_page of the file net/tls/tls_sw.c of the component TLS Handler. The manipulation results in use after free. This vulnerability is known as CVE-2024-26582. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.x/6.8-rc4 (Operating System). It has been classified as problematic. Affected is the function put_page of the file net/tls/tls_sw.c of the component TLS Handler. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: net: tls: fix use-after-free with partial reads and async decrypt tls_decrypt_sg doesn't take a reference on the pages from clear_skb, so the put_page() in tls_decrypt_done releases them, and we trigger a use-after-free in process_rx_list when we try to read from the partially-read skb.

The weakness was published 02/21/2024. The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2024-26582 since 02/19/2024. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/21/2024).

Upgrading to version 6.0 or 6.8-rc5 eliminates this vulnerability. Applying the patch 32b55c5ff910 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.x
• 6.8-rc1
• 6.8-rc2
• 6.8-rc3
• 6.8-rc4

License

• open-source

Website

• Vendor: https://www.kernel.org/

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