tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()
CVSS score
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EPSS probability
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Risk score
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Published
4 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%55
Short explanation
CVE-2026-99097 in the Linux kernel is an issue stemming from the lack of validation for zero-sized memory allocations within tee_dyn_shm_alloc_helper(). Triggering a zero-sized allocation via TEE_IOC_SHM_ALLOC causes the page allocator to trip a warning, which can end the boot process on panic_on_warn kernels.
This vulnerability is significant because handling zero-sized memory allocation requests can trigger kernel warnings and lead to boot termination on systems configured with panic_on_warn.
What should be done?
- Rejecting zero page counts to ensure proper validation
- Following vendor advisories for updates
Chain of evidence and sources
tee_dyn_shm_alloc_helper fonksiyonu, çağırandan gelen boyuttan sayfa sayısını türetir ve bunu kontrol etmeden alloc_pages_exact fonksiyonuna aktarır.
Sıfır boyutlu tahsisler, TEE_IOC_SHM_ALLOC ve tee_ioctl_shm_alloc_data yapısı üzerinden tetiklenebilir.
Show the technical text from the sources
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.
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-99097 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-99097 weaknesses.
Official Sources and Advisories
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