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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
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 CPE status
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)
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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)
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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 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-27T06:15:27+00:00",
      "cve": "CVE-2026-45870",
      "id": "CVE-2026-45870",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: SUNRPC: auth_gss: fix memory leaks in XDR decoding error paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45870.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:14:35Z",
      "cve": "CVE-2026-45870",
      "id": "CVE-2026-45870",
      "initial_release_date": "2026-05-28T03:57:09Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "639",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "316",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45870",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45870.json",
      "version": "18"
    }
  }
}



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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.