Vulnerability-Lookup

GHSA-787X-F6PF-8WG4

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

apparmor: aa_label_alloc use aa_label_free on alloc failure

aa_label_alloc() allocates a secid before allocating or taking the label proxy. If the later proxy step fails, the error path only freed the label memory, leaking any resources initialized by aa_label_init().

Use aa_label_free() on the failure path so partially initialized labels release their secid and other label resources before the backing memory is freed.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72459"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:19Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: aa_label_alloc use aa_label_free on alloc failure\n\naa_label_alloc() allocates a secid before allocating or taking the label\nproxy. If the later proxy step fails, the error path only freed the label\nmemory, leaking any resources initialized by aa_label_init().\n\nUse aa_label_free() on the failure path so partially initialized labels\nrelease their secid and other label resources before the backing memory is\nfreed.",
  "id": "GHSA-787x-f6pf-8wg4",
  "modified": "2026-08-17T06:33:31Z",
  "published": "2026-08-15T06:32:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72459"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/654fe7505dc6889724d4094fa64f89991afabfc3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d91479174240f39e9edea250d95fa08c678a207"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7cb69e109610bba500e1ecb870f7988a4717208a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae02e603c0b39b29f3ce6fe3efe01b286af1a2a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b14fbacad77d64594228983ec20d61a224f3f491"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5a9da5d36162d34db0f36abb15420e295176793"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf310b044e85d4de670c94295c5d8e4c5bc5e7bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc2192899d502e3321e60cf1e91421e7309d089c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72459 (GCVE-0-2026-72459)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44

Title

apparmor: aa_label_alloc use aa_label_free on alloc failure

Summary

In the Linux kernel, the following vulnerability has been resolved: apparmor: aa_label_alloc use aa_label_free on alloc failure aa_label_alloc() allocates a secid before allocating or taking the label proxy. If the later proxy step fails, the error path only freed the label memory, leaking any resources initialized by aa_label_init(). Use aa_label_free() on the failure path so partially initialized labels release their secid and other label resources before the backing memory is freed.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/b14fbacad77d64594…
https://git.kernel.org/stable/c/b5a9da5d36162d34d…
https://git.kernel.org/stable/c/7cb69e109610bba50…
https://git.kernel.org/stable/c/cc2192899d502e332…
https://git.kernel.org/stable/c/bf310b044e85d4de6…
https://git.kernel.org/stable/c/ae02e603c0b39b29f…
https://git.kernel.org/stable/c/6d91479174240f39e…
https://git.kernel.org/stable/c/654fe7505dc688972…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f1bd904175e8190ce14aedee37e207ab51fe3b30 , < b14fbacad77d64594228983ec20d61a224f3f491 (git) Affected: f1bd904175e8190ce14aedee37e207ab51fe3b30 , < b5a9da5d36162d34db0f36abb15420e295176793 (git) Affected: f1bd904175e8190ce14aedee37e207ab51fe3b30 , < 7cb69e109610bba500e1ecb870f7988a4717208a (git) Affected: f1bd904175e8190ce14aedee37e207ab51fe3b30 , < cc2192899d502e3321e60cf1e91421e7309d089c (git) Affected: f1bd904175e8190ce14aedee37e207ab51fe3b30 , < bf310b044e85d4de670c94295c5d8e4c5bc5e7bc (git) Affected: f1bd904175e8190ce14aedee37e207ab51fe3b30 , < ae02e603c0b39b29f3ce6fe3efe01b286af1a2a4 (git) Affected: f1bd904175e8190ce14aedee37e207ab51fe3b30 , < 6d91479174240f39e9edea250d95fa08c678a207 (git) Affected: f1bd904175e8190ce14aedee37e207ab51fe3b30 , < 654fe7505dc6889724d4094fa64f89991afabfc3 (git)
Linux	Linux	Affected: 4.13 Unaffected: 0 , < 4.13 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/apparmor/label.c"
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              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: aa_label_alloc use aa_label_free on alloc failure\n\naa_label_alloc() allocates a secid before allocating or taking the label\nproxy. If the later proxy step fails, the error path only freed the label\nmemory, leaking any resources initialized by aa_label_init().\n\nUse aa_label_free() on the failure path so partially initialized labels\nrelease their secid and other label resources before the backing memory is\nfreed."
        }
      ],
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in AppArmor LSM label allocation reached only through local kernel entry points (open/read/exec, unix socket mediation, change_hat/change_profile procattr) on AppArmor-enabled systems, not via remote network packet handling.\nAC:L - Triggering proxy allocation failure after secid allocation requires memory pressure, but an attacker can reliably induce kmalloc/GFP_ATOMIC exhaustion locally (memfd, large mappings, stress) while driving aa_label_merge through routine file or socket operations.\nPR:L - Any unprivileged local process running under AppArmor (default on Ubuntu, Debian, SUSE, Android) can reach aa_label_merge/aa_label_alloc through normal permitted file access, exec domain transitions, or unix-socket mediation without real-root or CAP_MAC_ADMIN.\nUI:N - Exploitation requires no victim or administrator interaction; the attacker uses only their own credentials and syscalls to create memory pressure and invoke AppArmor label-merge paths.\nS:U - Impact is kernel memory corruption, information disclosure, and denial of service within the host kernel security domain; it does not cross a VM, container, or IOMMU security boundary by itself.\nC:H - The error path called kfree() without aa_free_secid(), leaving the global secid xarray pointing at freed aa_label memory; aa_secid_to_label()/apparmor_secid_to_secctx() then dereference attacker-influenced freed slab for arbitrary kernel memory reads.\nI:H - Orphaned secid entries retain dangling aa_label pointers whose vec/profile fields can be reclaimed and sprayed; UAF traversal of those structures is a standard path to heap control and arbitrary kernel writes or code execution.\nA:H - Dereferencing stale label/profile pointers can cause kernel oops/panic, and each successful trigger permanently leaks a secid slot until reboot, eventually exhausting the global secid table and denying all future AppArmor label creation system-wide."
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        "dateUpdated": "2026-08-17T05:44:25.217Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/654fe7505dc6889724d4094fa64f89991afabfc3"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72459",
    "datePublished": "2026-08-15T05:57:04.794Z",
    "dateReserved": "2026-08-09T03:40:39.932Z",
    "dateUpdated": "2026-08-17T05:44:25.217Z",
    "state": "PUBLISHED"
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  "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.

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.

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GHSA-787X-F6PF-8WG4

CVE-2026-72459 (GCVE-0-2026-72459)

Tags

Sightings

Nomenclature