CVE-2025-39917 (GCVE-0-2025-39917)

Vulnerability from cvelistv5 – Published: 2025-10-01 07:44 – Updated: 2026-05-11 21:38
VLAI
Title
bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt Stanislav reported that in bpf_crypto_crypt() the destination dynptr's size is not validated to be at least as large as the source dynptr's size before calling into the crypto backend with 'len = src_len'. This can result in an OOB write when the destination is smaller than the source. Concretely, in mentioned function, psrc and pdst are both linear buffers fetched from each dynptr: psrc = __bpf_dynptr_data(src, src_len); [...] pdst = __bpf_dynptr_data_rw(dst, dst_len); [...] err = decrypt ? ctx->type->decrypt(ctx->tfm, psrc, pdst, src_len, piv) : ctx->type->encrypt(ctx->tfm, psrc, pdst, src_len, piv); The crypto backend expects pdst to be large enough with a src_len length that can be written. Add an additional src_len > dst_len check and bail out if it's the case. Note that these kfuncs are accessible under root privileges only.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 17:43 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6665 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < 0126358df12d6f476f79251d9c398ac5c1b3062d (git)
Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < c4be24ef0510c146dca4671effb127e97631534b (git)
Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < f9bb6ffa7f5ad0f8ee0f53fc4a10655872ee4a14 (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.48 , ≤ 6.12.* (semver)
Unaffected: 6.16.8 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.48",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.16.*",
                  "status": "unaffected",
                  "version": "6.16.8",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.48",
                      "versionStartIncluding": "6.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.16.8",
                      "versionStartIncluding": "6.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.17",
                      "versionStartIncluding": "6.10",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt\n\nStanislav reported that in bpf_crypto_crypt() the destination dynptr\u0027s\nsize is not validated to be at least as large as the source dynptr\u0027s\nsize before calling into the crypto backend with \u0027len = src_len\u0027. This\ncan result in an OOB write when the destination is smaller than the\nsource.\n\nConcretely, in mentioned function, psrc and pdst are both linear\nbuffers fetched from each dynptr:\n\n  psrc = __bpf_dynptr_data(src, src_len);\n  [...]\n  pdst = __bpf_dynptr_data_rw(dst, dst_len);\n  [...]\n  err = decrypt ?\n        ctx-\u003etype-\u003edecrypt(ctx-\u003etfm, psrc, pdst, src_len, piv) :\n        ctx-\u003etype-\u003eencrypt(ctx-\u003etfm, psrc, pdst, src_len, piv);\n\nThe crypto backend expects pdst to be large enough with a src_len length\nthat can be written. Add an additional src_len \u003e dst_len check and bail\nout if it\u0027s the case. Note that these kfuncs are accessible under root\nprivileges only."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-10-01T07:44:39.423Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/0126358df12d6f476f79251d9c398ac5c1b3062d"
            },
            {
              "url": "https://git.kernel.org/stable/c/c4be24ef0510c146dca4671effb127e97631534b"
            },
            {
              "url": "https://git.kernel.org/stable/c/f9bb6ffa7f5ad0f8ee0f53fc4a10655872ee4a14"
            }
          ],
          "title": "bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39917",
        "datePublished": "2025-10-01T07:44:39.423Z",
        "dateReserved": "2025-04-16T07:20:57.147Z",
        "dateUpdated": "2026-01-14T17:52:47.721Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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