What’s Vulnerable › Vulnerabilities

CVE-2024-56681: crypto: bcm - add error check in the ahash_hmac_init function

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-12-28 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: bcm - add error check in the ahash_hmac_init function The ahash_init functions may return fails. The ahash_hmac_init should not return ok when ahash_init returns error. For an example, ahash_init will return -ENOMEM when allocation memory is error.

Affected products

• Linux kernel: from 4.11 before 4.19.325; from 4.20 before 5.4.287; from 5.5 before 5.10.231; from 5.11 before 5.15.174; from 5.16 before 6.1.120; from 6.2 before 6.6.64 — fixed in 4.19.325, 5.10.231, 5.15.174, 5.4.287, 6.1.120, 6.11.11

How to fix

Upgrade to a fixed version: Linux kernel 4.19.325, 5.10.231, 5.15.174, 5.4.287. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/05f0a3f5477ecaa1cf46448504afe9e7c2e96fcc
• https://git.kernel.org/stable/c/19630cf57233e845b6ac57c9c969a4888925467b
• https://git.kernel.org/stable/c/28f8ffa945f7d7150463e15097ea73b19529d6f5
• https://git.kernel.org/stable/c/4ea3e3b761e371102bb1486778e2f8dbc9e37413
• https://git.kernel.org/stable/c/75e1e38e5d80d6d9011b7322698ffba3dd3db30a
• https://git.kernel.org/stable/c/8f1a9a960b1107bd0e0ec3736055f5ed0e717edf
• https://git.kernel.org/stable/c/ae5253313e0ea5f00c06176074592b7f493c8546
• https://git.kernel.org/stable/c/bba9e38c5ad41d0a88b22a59e5b6dd3e31825118
• https://git.kernel.org/stable/c/ee36db8e8203420e6d5c42eb9428920c2fc36532
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
• https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

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