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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
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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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-39917\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T17:43:01.533146Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T17:42:57.409Z\"}}], \"cna\": {\"title\": \"bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3e1c6f35409f9e447bf37f64840f5b65576bfb78\", \"lessThan\": \"0126358df12d6f476f79251d9c398ac5c1b3062d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3e1c6f35409f9e447bf37f64840f5b65576bfb78\", \"lessThan\": \"c4be24ef0510c146dca4671effb127e97631534b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3e1c6f35409f9e447bf37f64840f5b65576bfb78\", \"lessThan\": \"f9bb6ffa7f5ad0f8ee0f53fc4a10655872ee4a14\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/bpf/crypto.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.12.48\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.16.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/crypto.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.48\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16.8\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17\", \"versionStartIncluding\": \"6.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-10-01T07:44:39.423Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-39917\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-14T17:52:47.721Z\", \"dateReserved\": \"2025-04-16T07:20:57.147Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-10-01T07:44:39.423Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.