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

Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-05-11 22:13
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 4a264b2614c73c96666e196bbabe0cead52bdba7 (git)
Affected: e870456d8e7c8d57c059ea479b5aadbb55ff4c3a , < 8eceab19eba9dcbfd2a0daec72e1bf48aa100170 (git)
Create a notification for this product.
Linux 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)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "crypto/af_alg.c",
            "crypto/algif_skcipher.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9",
              "status": "affected",
              "version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
              "versionType": "git"
            },
            {
              "lessThan": "07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453",
              "status": "affected",
              "version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
              "versionType": "git"
            },
            {
              "lessThan": "4a264b2614c73c96666e196bbabe0cead52bdba7",
              "status": "affected",
              "version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
              "versionType": "git"
            },
            {
              "lessThan": "8eceab19eba9dcbfd2a0daec72e1bf48aa100170",
              "status": "affected",
              "version": "e870456d8e7c8d57c059ea479b5aadbb55ff4c3a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "crypto/af_alg.c",
            "crypto/algif_skcipher.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "lessThan": "4.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:13:30.305Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a264b2614c73c96666e196bbabe0cead52bdba7"
        },
        {
          "url": "https://git.kernel.org/stable/c/8eceab19eba9dcbfd2a0daec72e1bf48aa100170"
        }
      ],
      "title": "crypto: af_alg - limit RX SG extraction by receive buffer budget",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31677",
    "datePublished": "2026-04-25T08:46:53.379Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-05-11T22:13:30.305Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31677",
      "date": "2026-07-26",
      "epss": "0.00114",
      "percentile": "0.01738"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T14:02:12.000Z",
      "cve": "CVE-2026-31677",
      "id": "msrc_CVE-2026-31677",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "product_status:known_affected": "7",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "crypto: af_alg - limit RX SG extraction by receive buffer budget",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31677.json",
      "version": "8"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31677\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-25T09:16:01.330\",\"lastModified\":\"2026-06-17T10:34:13.220\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"crypto/af_alg.c\",\"crypto/algif_skcipher.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"4a264b2614c73c96666e196bbabe0cead52bdba7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e870456d8e7c8d57c059ea479b5aadbb55ff4c3a\",\"lessThan\":\"8eceab19eba9dcbfd2a0daec72e1bf48aa100170\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"crypto/af_alg.c\",\"crypto/algif_skcipher.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.83\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.24\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.14\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14\",\"versionEndExcluding\":\"6.12.83\",\"matchCriteriaId\":\"58CEE9D1-D59E-4E24-A222-20946659E048\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.24\",\"matchCriteriaId\":\"8126B8B8-6D0B-4443-86C1-672AEE893555\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.14\",\"matchCriteriaId\":\"D6A8A074-BBF4-4803-ABED-519A839435BB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D2315C0-D46F-4F85-9754-F9E5E11374A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"512EE3A8-A590-4501-9A94-5D4B268D6138\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4a264b2614c73c96666e196bbabe0cead52bdba7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8eceab19eba9dcbfd2a0daec72e1bf48aa100170\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T07:27:13+00:00",
      "cve": "CVE-2026-31677",
      "id": "CVE-2026-31677",
      "initial_release_date": "2026-04-25T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "70",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: af_alg - limit RX SG extraction by receive buffer budget",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31677.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:20:47Z",
      "cve": "CVE-2026-31677",
      "id": "CVE-2026-31677",
      "initial_release_date": "2026-04-26T01:52:44Z",
      "product_status:known_affected": "197",
      "product_status:known_not_affected": "21",
      "product_status:recommended": "131",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31677",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31677.json",
      "version": "8"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.