Vulnerability-Lookup

GHSA-C8FP-FF95-66MV

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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

arm64/gcs: Fix error handling in arch_set_shadow_stack_status()

alloc_gcs() returns an error-encoded pointer on failure, which comes from do_mmap(), not NULL.

The current NULL check fails to detect errors, which could lead to using an invalid GCS address.

Use IS_ERR_VALUE() to properly detect errors, consistent with the check in gcs_alloc_thread_stack().

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-45876"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/gcs: Fix error handling in arch_set_shadow_stack_status()\n\nalloc_gcs() returns an error-encoded pointer on failure, which comes\nfrom do_mmap(), not NULL.\n\nThe current NULL check fails to detect errors, which could lead to using\nan invalid GCS address.\n\nUse IS_ERR_VALUE() to properly detect errors, consistent with the\ncheck in gcs_alloc_thread_stack().",
  "id": "GHSA-c8fp-ff95-66mv",
  "modified": "2026-05-27T15:33:14Z",
  "published": "2026-05-27T15:33:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45876"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53c998527ffa60f9deda8974a11ad39790684159"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4741114c9622346c4bbb8cc2bbd88153616ffaf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c787a235deb33be6eda40beee8f561da5fd8cb8c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-45876 (GCVE-0-2026-45876)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:16 – Updated: 2026-05-27 12:16

Title

arm64/gcs: Fix error handling in arch_set_shadow_stack_status()

Summary

In the Linux kernel, the following vulnerability has been resolved: arm64/gcs: Fix error handling in arch_set_shadow_stack_status() alloc_gcs() returns an error-encoded pointer on failure, which comes from do_mmap(), not NULL. The current NULL check fails to detect errors, which could lead to using an invalid GCS address. Use IS_ERR_VALUE() to properly detect errors, consistent with the check in gcs_alloc_thread_stack().

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/c787a235deb33be6e…
https://git.kernel.org/stable/c/a4741114c9622346c…
https://git.kernel.org/stable/c/53c998527ffa60f9d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b57180c75c7ebff6613886cb69ef6e283a10358b , < c787a235deb33be6eda40beee8f561da5fd8cb8c (git) Affected: b57180c75c7ebff6613886cb69ef6e283a10358b , < a4741114c9622346c4bbb8cc2bbd88153616ffaf (git) Affected: b57180c75c7ebff6613886cb69ef6e283a10358b , < 53c998527ffa60f9deda8974a11ad39790684159 (git)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/mm/gcs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c787a235deb33be6eda40beee8f561da5fd8cb8c",
              "status": "affected",
              "version": "b57180c75c7ebff6613886cb69ef6e283a10358b",
              "versionType": "git"
            },
            {
              "lessThan": "a4741114c9622346c4bbb8cc2bbd88153616ffaf",
              "status": "affected",
              "version": "b57180c75c7ebff6613886cb69ef6e283a10358b",
              "versionType": "git"
            },
            {
              "lessThan": "53c998527ffa60f9deda8974a11ad39790684159",
              "status": "affected",
              "version": "b57180c75c7ebff6613886cb69ef6e283a10358b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/mm/gcs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "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": "6.18.14",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/gcs: Fix error handling in arch_set_shadow_stack_status()\n\nalloc_gcs() returns an error-encoded pointer on failure, which comes\nfrom do_mmap(), not NULL.\n\nThe current NULL check fails to detect errors, which could lead to using\nan invalid GCS address.\n\nUse IS_ERR_VALUE() to properly detect errors, consistent with the\ncheck in gcs_alloc_thread_stack()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:16:43.350Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c787a235deb33be6eda40beee8f561da5fd8cb8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4741114c9622346c4bbb8cc2bbd88153616ffaf"
        },
        {
          "url": "https://git.kernel.org/stable/c/53c998527ffa60f9deda8974a11ad39790684159"
        }
      ],
      "title": "arm64/gcs: Fix error handling in arch_set_shadow_stack_status()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45876",
    "datePublished": "2026-05-27T12:16:43.350Z",
    "dateReserved": "2026-05-13T15:03:33.081Z",
    "dateUpdated": "2026-05-27T12:16:43.350Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-C8FP-FF95-66MV

CVE-2026-45876 (GCVE-0-2026-45876)

Tags

Sightings

Nomenclature