CVE-2024-56681 (GCVE-0-2024-56681)
Vulnerability from cvelistv5
Published
2024-12-28 09:46
Modified
2026-08-05 11:46
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
Version: 9d12ba86f818aa9cfe9f01b750336aa441f2ffa2
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          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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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        "dateUpdated": "2026-08-05T11:46:02.716Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8f1a9a960b1107bd0e0ec3736055f5ed0e717edf"
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        {
          "url": "https://git.kernel.org/stable/c/75e1e38e5d80d6d9011b7322698ffba3dd3db30a"
        },
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          "url": "https://git.kernel.org/stable/c/28f8ffa945f7d7150463e15097ea73b19529d6f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ea3e3b761e371102bb1486778e2f8dbc9e37413"
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        {
          "url": "https://git.kernel.org/stable/c/05f0a3f5477ecaa1cf46448504afe9e7c2e96fcc"
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        {
          "url": "https://git.kernel.org/stable/c/19630cf57233e845b6ac57c9c969a4888925467b"
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      "title": "crypto: bcm - add error check in the ahash_hmac_init function",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56681",
    "datePublished": "2024-12-28T09:46:09.675Z",
    "dateReserved": "2024-12-27T15:00:39.846Z",
    "dateUpdated": "2026-08-05T11:46:02.716Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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