Vulnerability-Lookup

CVE-2026-23403 (GCVE-0-2026-23403)

Vulnerability from cvelistv5 – Published: 2026-04-01 08:36 – Updated: 2026-05-11 22:06

Title

apparmor: fix memory leak in verify_header

Summary

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix memory leak in verify_header The function sets `*ns = NULL` on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. This also breaks namespace consistency checking since *ns is always NULL when the comparison is made. Remove the incorrect assignment. The caller (aa_unpack) initializes *ns to NULL once before the loop, which is sufficient.

Severity

5.5 (Medium)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/9d678eb0fe55c9195…
https://git.kernel.org/stable/c/6b79abcb3c985e153…
https://git.kernel.org/stable/c/bcf82c0c5a8b383fd…
https://git.kernel.org/stable/c/663ce34786e759ebc…
https://git.kernel.org/stable/c/786e2c2a87d9c505f…
https://git.kernel.org/stable/c/4f0889f2df1ab9922…
https://git.kernel.org/stable/c/42fd831abfc15d064…
https://git.kernel.org/stable/c/e38c55d9f834e5b84…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 9d678eb0fe55c9195d9a253e8c5b82a87b930737 (git) Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 6b79abcb3c985e153fcf9d395e1d4336081aabc2 (git) Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < bcf82c0c5a8b383fd2d5d8f3fd880cdcab2ac557 (git) Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 663ce34786e759ebcbeb3060685c20bcc886d51a (git) Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 786e2c2a87d9c505f33321d1fd23a176aa8ddeb1 (git) Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 4f0889f2df1ab99224a5e1ac4e20437eea5fe38e (git) Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < 42fd831abfc15d0643c14688f0522556b347e7e6 (git) Affected: dd51c84857630e77c139afe4d9bba65fc051dc3f , < e38c55d9f834e5b848bfed0f5c586aaf45acb825 (git)	guessed
Linux	Linux	Affected: 3.12 Unaffected: 0 , < 3.12 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.169 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.77 , ≤ 6.12.* (semver) Unaffected: 6.18.18 , ≤ 6.18.* (semver) Unaffected: 6.19.8 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)	guessed

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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:01:42+00:00",
      "cve": "CVE-2026-23403",
      "id": "CVE-2026-23403",
      "initial_release_date": "2026-04-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: apparmor: fix memory leak in verify_header",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23403.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:28:57Z",
      "cve": "CVE-2026-23403",
      "id": "CVE-2026-23403",
      "initial_release_date": "2026-04-02T08:39:13Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "437",
      "product_status:known_not_affected": "44",
      "product_status:recommended": "490",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23403",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23403.json",
      "version": "12"
    }
  }
}

FKIE_CVE-2026-23403

Vulnerability from fkie_nvd - Published: 2026-04-01 09:16 - Updated: 2026-06-17 10:21

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/42fd831abfc15d0643c14688f0522556b347e7e6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4f0889f2df1ab99224a5e1ac4e20437eea5fe38e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/663ce34786e759ebcbeb3060685c20bcc886d51a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6b79abcb3c985e153fcf9d395e1d4336081aabc2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/786e2c2a87d9c505f33321d1fd23a176aa8ddeb1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9d678eb0fe55c9195d9a253e8c5b82a87b930737	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bcf82c0c5a8b383fd2d5d8f3fd880cdcab2ac557	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e38c55d9f834e5b848bfed0f5c586aaf45acb825	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	3.12
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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  "affected": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
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              "version": "3.12"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.169",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
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  "configurations": [
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              "vulnerable": true
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          ],
          "negate": false,
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        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix memory leak in verify_header\n\nThe function sets `*ns = NULL` on every call, leaking the namespace\nstring allocated in previous iterations when multiple profiles are\nunpacked. This also breaks namespace consistency checking since *ns\nis always NULL when the comparison is made.\n\nRemove the incorrect assignment.\nThe caller (aa_unpack) initializes *ns to NULL once before the loop,\nwhich is sufficient."
    }
  ],
  "id": "CVE-2026-23403",
  "lastModified": "2026-06-17T10:21:30.840",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-04-01T09:16:15.803",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/42fd831abfc15d0643c14688f0522556b347e7e6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/4f0889f2df1ab99224a5e1ac4e20437eea5fe38e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      ],
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-RR4H-G2X9-F96P

Vulnerability from github – Published: 2026-04-01 09:31 – Updated: 2026-04-24 21:31

Details

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

apparmor: fix memory leak in verify_header

The function sets *ns = NULL on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. This also breaks namespace consistency checking since *ns is always NULL when the comparison is made.

Remove the incorrect assignment. The caller (aa_unpack) initializes *ns to NULL once before the loop, which is sufficient.

Severity

5.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-23403"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-01T09:16:15Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix memory leak in verify_header\n\nThe function sets `*ns = NULL` on every call, leaking the namespace\nstring allocated in previous iterations when multiple profiles are\nunpacked. This also breaks namespace consistency checking since *ns\nis always NULL when the comparison is made.\n\nRemove the incorrect assignment.\nThe caller (aa_unpack) initializes *ns to NULL once before the loop,\nwhich is sufficient.",
  "id": "GHSA-rr4h-g2x9-f96p",
  "modified": "2026-04-24T21:31:57Z",
  "published": "2026-04-01T09:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23403"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42fd831abfc15d0643c14688f0522556b347e7e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f0889f2df1ab99224a5e1ac4e20437eea5fe38e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/663ce34786e759ebcbeb3060685c20bcc886d51a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b79abcb3c985e153fcf9d395e1d4336081aabc2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/786e2c2a87d9c505f33321d1fd23a176aa8ddeb1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d678eb0fe55c9195d9a253e8c5b82a87b930737"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e38c55d9f834e5b848bfed0f5c586aaf45acb825"
    }
  ],
  "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"
    }
  ]
}

MSRC_CVE-2026-23403

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-27 14:41

Summary

apparmor: fix memory leak in verify_header

Scope

1 vulnerability in this advisory, including CVE-2026-23403.

CVE-2026-23403

Fixed: 1 product Known affected: 2 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2026:20826-1

Vulnerability from csaf_opensuse - Published: 2026-05-28 12:58 - Updated: 2026-05-28 12:58

Summary

Security update for the Linux Kernel

Severity

Important

Scope

206 vulnerabilities in this advisory, including CVE-2026-23403.

CVE-2026-23403

6.6 (Medium)


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

Recommended: 136 products

Open the full advisory

SUSE-SU-2026:2068-1

Vulnerability from csaf_suse - Published: 2026-05-26 07:29 - Updated: 2026-05-26 07:29

Summary

Security update for the Linux Kernel

Severity

Important

Scope

74 vulnerabilities in this advisory, including CVE-2026-23403.

CVE-2026-23403

6.6 (Medium)


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

Recommended: 56 products

Open the full advisory

SUSE-SU-2026:2111-1

Vulnerability from csaf_suse - Published: 2026-05-29 15:22 - Updated: 2026-05-29 15:22

Summary

Security update for the Linux Kernel

Severity

Important

Scope

62 vulnerabilities in this advisory, including CVE-2026-23403.

CVE-2026-23403

6.6 (Medium)


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

Recommended: 4 products

Open the full advisory

SUSE-SU-2026:21841-1

Vulnerability from csaf_suse - Published: 2026-05-28 11:40 - Updated: 2026-05-28 11:40

Summary

Security update for the Linux Kernel

Severity

Important

Scope

206 vulnerabilities in this advisory, including CVE-2026-23403.

CVE-2026-23403

6.6 (Medium)


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

Recommended: 28 products

Open the full advisory

SUSE-SU-2026:21845-1

Vulnerability from csaf_suse - Published: 2026-05-28 11:49 - Updated: 2026-05-28 11:49

Summary

Security update for the Linux Kernel

Severity

Important

Scope

206 vulnerabilities in this advisory, including CVE-2026-23403.

CVE-2026-23403

6.6 (Medium)


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

Recommended: 9 products

Open the full advisory

SUSE-SU-2026:21860-1

Vulnerability from csaf_suse - Published: 2026-05-28 11:40 - Updated: 2026-05-28 11:40

Summary

Security update for the Linux Kernel

Severity

Important

Scope

206 vulnerabilities in this advisory, including CVE-2026-23403.

CVE-2026-23403

6.6 (Medium)


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

Recommended: 114 products

Open the full advisory

SUSE-SU-2026:21876-1

Vulnerability from csaf_suse - Published: 2026-05-29 15:23 - Updated: 2026-05-29 15:23

Summary

Security update for the Linux Kernel

Severity

Important

Scope

181 vulnerabilities in this advisory, including CVE-2026-23403.

CVE-2026-23403

6.6 (Medium)


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

Recommended: 7 products

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-23403 (GCVE-0-2026-23403)

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Sightings

Nomenclature

Related by attack behaviour