Vulnerability-Lookup

GHSA-25G2-2JJ3-XVXX

Vulnerability from github – Published: 2026-04-25 09:30 – Updated: 2026-05-06 21:31

Details

In the Linux kernel, the following vulnerability has been resolved:

crypto: af_alg - limit RX SG extraction by receive buffer budget

Make af_alg_get_rsgl() limit each RX scatterlist extraction to the remaining receive buffer budget.

af_alg_get_rsgl() currently uses af_alg_readable() only as a gate before extracting data into the RX scatterlist. Limit each extraction to the remaining af_alg_rcvbuf(sk) budget so that receive-side accounting matches the amount of data attached to the request.

If skcipher cannot obtain enough RX space for at least one chunk while more data remains to be processed, reject the recvmsg call instead of rounding the request length down to zero.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31677"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-25T09:16:01Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: af_alg - limit RX SG extraction by receive buffer budget\n\nMake af_alg_get_rsgl() limit each RX scatterlist extraction to the\nremaining receive buffer budget.\n\naf_alg_get_rsgl() currently uses af_alg_readable() only as a gate\nbefore extracting data into the RX scatterlist. Limit each extraction\nto the remaining af_alg_rcvbuf(sk) budget so that receive-side\naccounting matches the amount of data attached to the request.\n\nIf skcipher cannot obtain enough RX space for at least one chunk while\nmore data remains to be processed, reject the recvmsg call instead of\nrounding the request length down to zero.",
  "id": "GHSA-25g2-2jj3-xvxx",
  "modified": "2026-05-06T21:31:30Z",
  "published": "2026-04-25T09:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31677"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a264b2614c73c96666e196bbabe0cead52bdba7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8eceab19eba9dcbfd2a0daec72e1bf48aa100170"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31677 (GCVE-0-2026-31677)

Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-04-25 08:46

Title

crypto: af_alg - limit RX SG extraction by receive buffer budget

Summary

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - limit RX SG extraction by receive buffer budget Make af_alg_get_rsgl() limit each RX scatterlist extraction to the remaining receive buffer budget. af_alg_get_rsgl() currently uses af_alg_readable() only as a gate before extracting data into the RX scatterlist. Limit each extraction to the remaining af_alg_rcvbuf(sk) budget so that receive-side accounting matches the amount of data attached to the request. If skcipher cannot obtain enough RX space for at least one chunk while more data remains to be processed, reject the recvmsg call instead of rounding the request length down to zero.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/9bf3e6ccfdcfe56ae…
	https://git.kernel.org/stable/c/07c6f6ffe29009426…
	https://git.kernel.org/stable/c/4a264b2614c73c966…
	https://git.kernel.org/stable/c/8eceab19eba9dcbfd…

Impacted products

Vendor

Product

Version

Linux

Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 4a264b2614c73c96666e196bbabe0cead52bdba7 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 8eceab19eba9dcbfd2a0daec72e1bf48aa100170 (git)

Linux

Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "crypto/af_alg.c",
            "crypto/algif_skcipher.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
              "versionType": "git"
            },
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          "versions": [
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              "version": "4.14"
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              "version": "0",
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
                {
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      "providerMetadata": {
        "dateUpdated": "2026-04-25T08:46:53.379Z",
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      "title": "crypto: af_alg - limit RX SG extraction by receive buffer budget",
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    "datePublished": "2026-04-25T08:46:53.379Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-04-25T08:46:53.379Z",
    "state": "PUBLISHED"
  },
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}

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.

Action not permitted

GHSA-25G2-2JJ3-XVXX

CVE-2026-31677 (GCVE-0-2026-31677)

Tags

Sightings

Nomenclature