CVE-2026-45870 (GCVE-0-2026-45870)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:15 – Updated: 2026-05-27 12:15
VLAI
Title
SUNRPC: auth_gss: fix memory leaks in XDR decoding error paths
Summary
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: auth_gss: fix memory leaks in XDR decoding error paths The gssx_dec_ctx(), gssx_dec_status(), and gssx_dec_name() functions allocate memory via gssx_dec_buffer(), which calls kmemdup(). When a subsequent decode operation fails, these functions return immediately without freeing previously allocated buffers, causing memory leaks. The leak in gssx_dec_ctx() is particularly relevant because the caller (gssp_accept_sec_context_upcall) initializes several buffer length fields to non-zero values, resulting in memory allocation: struct gssx_ctx rctxh = { .exported_context_token.len = GSSX_max_output_handle_sz, .mech.len = GSS_OID_MAX_LEN, .src_name.display_name.len = GSSX_max_princ_sz, .targ_name.display_name.len = GSSX_max_princ_sz }; If, for example, gssx_dec_name() succeeds for src_name but fails for targ_name, the memory allocated for exported_context_token, mech, and src_name.display_name remains unreferenced and cannot be reclaimed. Add error handling with goto-based cleanup to free any previously allocated buffers before returning an error.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < c81431b1b9fbd21e9a5a9211b5517b7295d18e6a (git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < caf7eff432e91a9eba1c79fa545c2f54be15d62b (git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 64303b92d94c0c7845a273acd8d84b796d6f1db7 (git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < df10f23defff22c8d55fe6db74f6e4ce927145bf (git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < b4af3806846778799cd4ab0766dc18341e777264 (git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < d79b9097a6a2b91471b40755f1225364be5d85ff (git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 3b56eb90feb8a3709417f5624f3871847d42bcb1 (git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 3e6397b056335cc56ef0e9da36c95946a19f5118 (git)
Create a notification for this product.
Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 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": [
            "net/sunrpc/auth_gss/gss_rpc_xdr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c81431b1b9fbd21e9a5a9211b5517b7295d18e6a",
              "status": "affected",
              "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
              "versionType": "git"
            },
            {
              "lessThan": "caf7eff432e91a9eba1c79fa545c2f54be15d62b",
              "status": "affected",
              "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
              "versionType": "git"
            },
            {
              "lessThan": "64303b92d94c0c7845a273acd8d84b796d6f1db7",
              "status": "affected",
              "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
              "versionType": "git"
            },
            {
              "lessThan": "df10f23defff22c8d55fe6db74f6e4ce927145bf",
              "status": "affected",
              "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
              "versionType": "git"
            },
            {
              "lessThan": "b4af3806846778799cd4ab0766dc18341e777264",
              "status": "affected",
              "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
              "versionType": "git"
            },
            {
              "lessThan": "d79b9097a6a2b91471b40755f1225364be5d85ff",
              "status": "affected",
              "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
              "versionType": "git"
            },
            {
              "lessThan": "3b56eb90feb8a3709417f5624f3871847d42bcb1",
              "status": "affected",
              "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
              "versionType": "git"
            },
            {
              "lessThan": "3e6397b056335cc56ef0e9da36c95946a19f5118",
              "status": "affected",
              "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/auth_gss/gss_rpc_xdr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.10"
            },
            {
              "lessThan": "3.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "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": "5.10.252",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: auth_gss: fix memory leaks in XDR decoding error paths\n\nThe gssx_dec_ctx(), gssx_dec_status(), and gssx_dec_name()\nfunctions allocate memory via gssx_dec_buffer(), which calls\nkmemdup(). When a subsequent decode operation fails, these\nfunctions return immediately without freeing previously\nallocated buffers, causing memory leaks.\n\nThe leak in gssx_dec_ctx() is particularly relevant because\nthe caller (gssp_accept_sec_context_upcall) initializes several\nbuffer length fields to non-zero values, resulting in memory\nallocation:\n\n    struct gssx_ctx rctxh = {\n        .exported_context_token.len = GSSX_max_output_handle_sz,\n        .mech.len = GSS_OID_MAX_LEN,\n        .src_name.display_name.len = GSSX_max_princ_sz,\n        .targ_name.display_name.len = GSSX_max_princ_sz\n    };\n\nIf, for example, gssx_dec_name() succeeds for src_name but\nfails for targ_name, the memory allocated for\nexported_context_token, mech, and src_name.display_name\nremains unreferenced and cannot be reclaimed.\n\nAdd error handling with goto-based cleanup to free any\npreviously allocated buffers before returning an error."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:15:50.199Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c81431b1b9fbd21e9a5a9211b5517b7295d18e6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/caf7eff432e91a9eba1c79fa545c2f54be15d62b"
        },
        {
          "url": "https://git.kernel.org/stable/c/64303b92d94c0c7845a273acd8d84b796d6f1db7"
        },
        {
          "url": "https://git.kernel.org/stable/c/df10f23defff22c8d55fe6db74f6e4ce927145bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4af3806846778799cd4ab0766dc18341e777264"
        },
        {
          "url": "https://git.kernel.org/stable/c/d79b9097a6a2b91471b40755f1225364be5d85ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b56eb90feb8a3709417f5624f3871847d42bcb1"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e6397b056335cc56ef0e9da36c95946a19f5118"
        }
      ],
      "title": "SUNRPC: auth_gss: fix memory leaks in XDR decoding error paths",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45870",
    "datePublished": "2026-05-27T12:15:50.199Z",
    "dateReserved": "2026-05-13T15:03:33.081Z",
    "dateUpdated": "2026-05-27T12:15:50.199Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45870",
      "date": "2026-05-29",
      "epss": "0.00024",
      "percentile": "0.07393"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45870\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-27T14:17:00.420\",\"lastModified\":\"2026-05-27T14:48:31.480\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nSUNRPC: auth_gss: fix memory leaks in XDR decoding error paths\\n\\nThe gssx_dec_ctx(), gssx_dec_status(), and gssx_dec_name()\\nfunctions allocate memory via gssx_dec_buffer(), which calls\\nkmemdup(). When a subsequent decode operation fails, these\\nfunctions return immediately without freeing previously\\nallocated buffers, causing memory leaks.\\n\\nThe leak in gssx_dec_ctx() is particularly relevant because\\nthe caller (gssp_accept_sec_context_upcall) initializes several\\nbuffer length fields to non-zero values, resulting in memory\\nallocation:\\n\\n    struct gssx_ctx rctxh = {\\n        .exported_context_token.len = GSSX_max_output_handle_sz,\\n        .mech.len = GSS_OID_MAX_LEN,\\n        .src_name.display_name.len = GSSX_max_princ_sz,\\n        .targ_name.display_name.len = GSSX_max_princ_sz\\n    };\\n\\nIf, for example, gssx_dec_name() succeeds for src_name but\\nfails for targ_name, the memory allocated for\\nexported_context_token, mech, and src_name.display_name\\nremains unreferenced and cannot be reclaimed.\\n\\nAdd error handling with goto-based cleanup to free any\\npreviously allocated buffers before returning an error.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3b56eb90feb8a3709417f5624f3871847d42bcb1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e6397b056335cc56ef0e9da36c95946a19f5118\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64303b92d94c0c7845a273acd8d84b796d6f1db7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b4af3806846778799cd4ab0766dc18341e777264\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c81431b1b9fbd21e9a5a9211b5517b7295d18e6a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/caf7eff432e91a9eba1c79fa545c2f54be15d62b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d79b9097a6a2b91471b40755f1225364be5d85ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df10f23defff22c8d55fe6db74f6e4ce927145bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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.