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CVE-2024-56681 (GCVE-0-2024-56681)

Vulnerability from cvelistv5 – Published: 2024-12-28 09:46 – Updated: 2026-08-05 11:46
VLAI
Title
crypto: bcm - add error check in the ahash_hmac_init function
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < 8f1a9a960b1107bd0e0ec3736055f5ed0e717edf (git)
Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < 75e1e38e5d80d6d9011b7322698ffba3dd3db30a (git)
Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < 28f8ffa945f7d7150463e15097ea73b19529d6f5 (git)
Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < 4ea3e3b761e371102bb1486778e2f8dbc9e37413 (git)
Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < 05f0a3f5477ecaa1cf46448504afe9e7c2e96fcc (git)
Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < ae5253313e0ea5f00c06176074592b7f493c8546 (git)
Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < ee36db8e8203420e6d5c42eb9428920c2fc36532 (git)
Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < bba9e38c5ad41d0a88b22a59e5b6dd3e31825118 (git)
Affected: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2 , < 19630cf57233e845b6ac57c9c969a4888925467b (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 4.19.325 , ≤ 4.19.* (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.11.11 , ≤ 6.11.* (semver)
Unaffected: 6.12.2 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - The reliable trigger is a local unprivileged process driving the driver\u0027s ahash through AF_ALG (algif_hash) socket syscalls; in-kernel remote consumers of crypto_ahash_init() on hmac algorithms (tcp_ao, gss_krb5) would additionally require an allocation failure the remote peer cannot control.\nAC:L - The attacker sets a zero-length HMAC key via ALG_SET_KEY, which makes ahash_init() skip setkey and hit the deterministic -ENOKEY error path that frees ctx-\u003eshash without clearing it \u2014 no race, no memory pressure, and the freed object can be groomed between syscalls before the update() use.\nPR:L - Any unprivileged local user can open an AF_ALG hash socket and bind to the driver\u0027s algorithm/driver name (hmac-sha1-iproc); no capability check exists on this path.\nUI:N - The attacker performs the entire socket/setkey/sendmsg sequence itself; no victim action is involved.\nS:U - The corruption is confined to kernel heap memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale ctx-\u003eshash is dereferenced as a shash_desc, so an attacker who reclaims the freed slab object controls the tfm pointer and the resulting digest data returned to userspace, giving a use-after-free read primitive over kernel memory.\nI:H - crypto_shash_update()/final() perform an indirect call through a function-pointer table reached from the freed object, and ahash_final() then does crypto_free_shash(ctx-\u003eshash-\u003etfm) plus kfree(ctx-\u003eshash) \u2014 a double free and a free of an attacker-supplied pointer, which is a control-flow-hijack/arbitrary-write primitive.\nA:H - In the -ENOMEM case ctx-\u003eshash is NULL and the subsequent crypto_shash_update()/final() dereference NULL, and in the -ENOKEY case the use-after-free and double free reliably oops or panic the kernel."
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    "dateReserved": "2024-12-27T15:00:39.846Z",
    "dateUpdated": "2026-08-05T11:46:02.716Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2024-56681",
      "date": "2026-09-17",
      "epss": "0.00241",
      "percentile": "0.15481"
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncrypto: bcm - add error check in the ahash_hmac_init function\\n\\nThe ahash_init functions may return fails. The ahash_hmac_init should\\nnot return ok when ahash_init returns error. For an example, ahash_init\\nwill return -ENOMEM when allocation memory is error.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: crypto: bcm - a\\u00f1adir comprobaci\\u00f3n de errores en la funci\\u00f3n ahash_hmac_init Las funciones ahash_init pueden devolver errores. La funci\\u00f3n ahash_hmac_init no deber\\u00eda devolver ok cuando ahash_init devuelve un error. Por ejemplo, ahash_init devolver\\u00e1 -ENOMEM cuando la memoria de asignaci\\u00f3n sea err\\u00f3nea.\"}]",
      "id": "CVE-2024-56681",
      "lastModified": "2024-12-28T10:15:09.967",
      "published": "2024-12-28T10:15:09.967",
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56681\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-28T10:15:09.967\",\"lastModified\":\"2026-08-04T11:22:20.943\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncrypto: bcm - add error check in the ahash_hmac_init function\\n\\nThe ahash_init functions may return fails. The ahash_hmac_init should\\nnot return ok when ahash_init returns error. For an example, ahash_init\\nwill return -ENOMEM when allocation memory is error.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: crypto: bcm - a\u00f1adir comprobaci\u00f3n de errores en la funci\u00f3n ahash_hmac_init Las funciones ahash_init pueden devolver errores. La funci\u00f3n ahash_hmac_init no deber\u00eda devolver ok cuando ahash_init devuelve un error. Por ejemplo, ahash_init devolver\u00e1 -ENOMEM cuando la memoria de asignaci\u00f3n sea err\u00f3nea.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/crypto/bcm/cipher.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"8f1a9a960b1107bd0e0ec3736055f5ed0e717edf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"75e1e38e5d80d6d9011b7322698ffba3dd3db30a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"28f8ffa945f7d7150463e15097ea73b19529d6f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"4ea3e3b761e371102bb1486778e2f8dbc9e37413\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"05f0a3f5477ecaa1cf46448504afe9e7c2e96fcc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"ae5253313e0ea5f00c06176074592b7f493c8546\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"ee36db8e8203420e6d5c42eb9428920c2fc36532\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"bba9e38c5ad41d0a88b22a59e5b6dd3e31825118\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d12ba86f818aa9cfe9f01b750336aa441f2ffa2\",\"lessThan\":\"19630cf57233e845b6ac57c9c969a4888925467b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/crypto/bcm/cipher.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.325\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.287\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.231\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.174\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.120\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.64\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.11.11\",\"lessThanOrEqual\":\"6.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.2\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.11\",\"versionEndExcluding\":\"4.19.325\",\"matchCriteriaId\":\"2E896CE0-6F5D-4FEF-B4C4-47311F4B507D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.287\",\"matchCriteriaId\":\"E4B15788-D35E-4E5B-A9C0-070AE3729B34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.231\",\"matchCriteriaId\":\"B5C644CC-2BD7-4E32-BC54-8DCC7ABE9935\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.174\",\"matchCriteriaId\":\"419FD073-1517-4FD5-8158-F94BC68A1E89\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.120\",\"matchCriteriaId\":\"09AC6122-E2A4-40FE-9D33-268A1B2EC265\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.64\",\"matchCriteriaId\":\"CA16DEE3-ABEC-4449-9F4A-7A3DC4FC36C7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.11\",\"matchCriteriaId\":\"21434379-192D-472F-9B54-D45E3650E893\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12\",\"versionEndExcluding\":\"6.12.2\",\"matchCriteriaId\":\"D8882B1B-2ABC-4838-AC1D-DBDBB5764776\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05f0a3f5477ecaa1cf46448504afe9e7c2e96fcc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/19630cf57233e845b6ac57c9c969a4888925467b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/28f8ffa945f7d7150463e15097ea73b19529d6f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4ea3e3b761e371102bb1486778e2f8dbc9e37413\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/75e1e38e5d80d6d9011b7322698ffba3dd3db30a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8f1a9a960b1107bd0e0ec3736055f5ed0e717edf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ae5253313e0ea5f00c06176074592b7f493c8546\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bba9e38c5ad41d0a88b22a59e5b6dd3e31825118\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ee36db8e8203420e6d5c42eb9428920c2fc36532\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:40:29+00:00",
      "cve": "CVE-2024-56681",
      "id": "CVE-2024-56681",
      "initial_release_date": "2024-12-28T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: bcm - add error check in the ahash_hmac_init function",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56681.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-12T16:55:50Z",
      "cve": "CVE-2024-56681",
      "id": "CVE-2024-56681",
      "initial_release_date": "2024-12-29T03:48:23Z",
      "product_status:known_affected": "671",
      "product_status:known_not_affected": "58",
      "product_status:recommended": "485",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-56681",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-56681.json",
      "version": "70"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.