Vulnerability-Lookup

GHSA-6FPW-5CHX-RGH9

Vulnerability from github – Published: 2026-10-26 15:34 – Updated: 2026-10-26 15:34

Details

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

tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()

tee_dyn_shm_alloc_helper() derives nr_pages from a caller-supplied size and passes it to alloc_pages_exact() without checking it. For size == 0 nr_pages is 0, and alloc_pages_exact(0) calls get_order(0), which is documented as undefined and returns BITS_PER_LONG - PAGE_SHIFT. The page allocator then trips its order > MAX_PAGE_ORDER warning and fails the allocation; on a panic_on_warn kernel that ends the boot.

This can be triggered by TEE_IOC_SHM_ALLOC with struct tee_ioctl_shm_alloc_data where size is 0.

Reject a zero page count, as register_shm_helper() already does for the register path.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99097"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-26T15:16:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()\n\ntee_dyn_shm_alloc_helper() derives nr_pages from a caller-supplied size\nand passes it to alloc_pages_exact() without checking it. For size == 0\nnr_pages is 0, and alloc_pages_exact(0) calls get_order(0), which is\ndocumented as undefined and returns BITS_PER_LONG - PAGE_SHIFT. The page\nallocator then trips its order \u003e MAX_PAGE_ORDER warning and fails the\nallocation; on a panic_on_warn kernel that ends the boot.\n\nThis can be triggered by TEE_IOC_SHM_ALLOC with struct\ntee_ioctl_shm_alloc_data where size is 0.\n\nReject a zero page count, as register_shm_helper() already does for the\nregister path.",
  "id": "GHSA-6fpw-5chx-rgh9",
  "modified": "2026-10-26T15:34:50Z",
  "published": "2026-10-26T15:34:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99097"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65cb86860a80ffc6af897d53f5bd4b1733bca0ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7f925fd5226deb953c8dcdc9677d3fcc2717c00"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2a97703359e25ec7ef8b2b0ef32fb3982add90a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99097 (GCVE-0-2026-99097)

Vulnerability from cvelistv5 – Published: 2026-10-26 14:52 – Updated: 2026-10-26 14:52

Title

tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()

Summary

In the Linux kernel, the following vulnerability has been resolved: tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper() tee_dyn_shm_alloc_helper() derives nr_pages from a caller-supplied size and passes it to alloc_pages_exact() without checking it. For size == 0 nr_pages is 0, and alloc_pages_exact(0) calls get_order(0), which is documented as undefined and returns BITS_PER_LONG - PAGE_SHIFT. The page allocator then trips its order > MAX_PAGE_ORDER warning and fails the allocation; on a panic_on_warn kernel that ends the boot. This can be triggered by TEE_IOC_SHM_ALLOC with struct tee_ioctl_shm_alloc_data where size is 0. Reject a zero page count, as register_shm_helper() already does for the register path.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/e5dc7af9c3a5373ee…
https://git.kernel.org/stable/c/65cb86860a80ffc6a…
https://git.kernel.org/stable/c/c2a97703359e25ec7…
https://git.kernel.org/stable/c/b7f925fd5226deb95…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cf4441503e20a0c0a36e0a98dcf57de3d3844c91 , < e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d (git) Affected: cf4441503e20a0c0a36e0a98dcf57de3d3844c91 , < 65cb86860a80ffc6af897d53f5bd4b1733bca0ec (git) Affected: cf4441503e20a0c0a36e0a98dcf57de3d3844c91 , < c2a97703359e25ec7ef8b2b0ef32fb3982add90a (git) Affected: cf4441503e20a0c0a36e0a98dcf57de3d3844c91 , < b7f925fd5226deb953c8dcdc9677d3fcc2717c00 (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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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.

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