{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2024-56558",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-56558",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-12-27T14:23:03.902Z",
    "updatedAt": "2026-08-05T11:45:06.425Z",
    "importedAt": "2026-10-24T01:57:20.494Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "nfsd: make sure exp active before svc_export_show",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: make sure exp active before svc_export_show\n\nThe function `e_show` was called with protection from RCU. This only\nensures that `exp` will not be freed. Therefore, the reference count for\n`exp` can drop to zero, which will trigger a refcount use-after-free\nwarning when `exp_get` is called. To resolve this issue, use\n`cache_get_rcu` to ensure that `exp` remains active.\n\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 3 PID: 819 at lib/refcount.c:25\nrefcount_warn_saturate+0xb1/0x120\nCPU: 3 UID: 0 PID: 819 Comm: cat Not tainted 6.12.0-rc3+ #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nRIP: 0010:refcount_warn_saturate+0xb1/0x120\n...\nCall Trace:\n <TASK>\n e_show+0x20b/0x230 [nfsd]\n seq_read_iter+0x589/0x770\n seq_read+0x1e5/0x270\n vfs_read+0x125/0x530\n ksys_read+0xc1/0x160\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "bf18f163e89c52e09c96534db45c4274273a0b34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e2fa0d0e327279a8defb87b263cd0bf288fd9261"
            },
            {
              "version": "bf18f163e89c52e09c96534db45c4274273a0b34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7fd29d284b55c2274f7a748e6c5f25b4758b8da5"
            },
            {
              "version": "bf18f163e89c52e09c96534db45c4274273a0b34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6cefcadd34e3c71c81ea64b899a0daa86314a51a"
            },
            {
              "version": "bf18f163e89c52e09c96534db45c4274273a0b34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec"
            },
            {
              "version": "bf18f163e89c52e09c96534db45c4274273a0b34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1cecfdbc6bfc89c516d286884c7f29267b95de2b"
            },
            {
              "version": "bf18f163e89c52e09c96534db45c4274273a0b34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7365d1f8de63cffdbbaa2287ce0205438e1a922f"
            },
            {
              "version": "bf18f163e89c52e09c96534db45c4274273a0b34",
              "status": "affected",
              "versionType": "git",
              "lessThan": "be8f982c369c965faffa198b46060f8853e0f1f0"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.17",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.17"
            },
            {
              "version": "5.4.287",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.231",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.174",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.120",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.64",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.13",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}