CVE-2024-26584: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net: tls: handle backlogging of crypto requests Since we're setting the CRYPTO_TFM_REQ_MAY_BACKLOG flag on our requests to the crypto API, crypto_aead_{encrypt,decrypt} can return -EBUSY instead of -EINPROGRESS in valid situations. For example, when the cryptd queue for AESNI is full (easy to trigger with an artificially low cryptd.cryptd_max_cpu_qlen), requests will be enqueued to the backlog but still processed. In that case, the async callback will also be called twice: first with err == -EINPROGRESS, which it seems we can just ignore, then with err == 0. Compared to Sabrina's original patch this version uses the new tls_*crypt_async_wait() helpers and converts the EBUSY to EINPROGRESS to avoid having to modify all the error handling paths. The handling is identical.

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CVSS v3.1 Score

5.5

MEDIUM

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

Weakness Type (CWE)

CWE-755 CWE-755

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.16.0 — 6.1.84
linux	linux_kernel	6.2.0 — 6.6.18
linux	linux_kernel	6.7.0 — 6.7.6

References

Advisories & Patches

https://git.kernel.org/stable/c/13eca403876bbea3716e82cdfe6f1e6febb38754 https://git.kernel.org/stable/c/8590541473188741055d27b955db0777569438e3 https://git.kernel.org/stable/c/ab6397f072e5097f267abf5cb08a8004e6b17694 https://git.kernel.org/stable/c/cd1bbca03f3c1d845ce274c0d0a66de8e5929f72 https://git.kernel.org/stable/c/13eca403876bbea3716e82cdfe6f1e6febb38754 https://git.kernel.org/stable/c/8590541473188741055d27b955db0777569438e3 https://git.kernel.org/stable/c/ab6397f072e5097f267abf5cb08a8004e6b17694 https://git.kernel.org/stable/c/cd1bbca03f3c1d845ce274c0d0a66de8e5929f72

Other References

https://git.kernel.org/stable/c/3ade391adc584f17b5570fd205de3ad029090368 https://git.kernel.org/stable/c/3ade391adc584f17b5570fd205de3ad029090368 https://lists.fedoraproject.org/archives/list/[email protected]/message/EZOU3745CWCDZ7EMKMXB2OEEIB5Q3IWM/

Frequently Asked Questions

What is CVE-2024-26584? +

In the Linux kernel, the following vulnerability has been resolved: net: tls: handle backlogging of crypto requests Since we're setting the CRYPTO_TFM_REQ_MAY_BACKLOG flag on our requests to the crypto API, crypto_aead_{encrypt,decrypt} can return -EBUSY instead of -EINPROGRESS in valid situations. For example, when the cryptd queue for AESNI is full (easy to trigger with an artificially low cryptd.cryptd_max_cpu_qlen), requests will be enqueued to the backlog but still processed. In that case, the async callback will also be called twice: first with err == -EINPROGRESS, which it seems we can just ignore, then with err == 0. Compared to Sabrina's original patch this version uses the new tls_*crypt_async_wait() helpers and converts the EBUSY to EINPROGRESS to avoid having to modify all the error handling paths. The handling is identical. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-26584? +

CVE-2024-26584 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-26584? +

CVE-2024-26584 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-2024-26584? +

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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