CVE-2026-99097

Kernel panic via unchecked zero-size allocation

Published Oct 26, 2026 · Updated Oct 26, 2026

An allocation validation flaw in Linux TEE allows local users to crash the kernel via a zero-size shared-memory request. The tee_dyn_shm_alloc_helper() function passes the unchecked size to alloc_pages_exact(), reaching undefined get_order(0) behavior and an allocator warning. Access to the affected TEE_IOC_SHM_ALLOC path is required; panic_on_warn turns the warning into a kernel panic, while otherwise the allocation fails.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An allocation validation flaw in Linux TEE allows local users to crash the kernel via a zero-size shared-memory request. The tee_dyn_shm_alloc_helper() function passes the unchecked size to alloc_pages_exact(), reaching undefined get_order(0) behavior and an allocator warning. Access to the affected TEE_IOC_SHM_ALLOC path is required; panic_on_warn turns the warning into a kernel panic, while otherwise the allocation fails.

The record

CVE
CVE-2026-99097
Published
Oct 26, 2026
Updated
Oct 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.10
  2. Affected versionversion=cf4441503e20a0c0a36e0a98dcf57de3d3844c91 <65cb86860a80ffc6af897d53f5bd4b1733bca0ec
  3. Affected versionversion=cf4441503e20a0c0a36e0a98dcf57de3d3844c91 <b7f925fd5226deb953c8dcdc9677d3fcc2717c00
  4. Affected versionversion=cf4441503e20a0c0a36e0a98dcf57de3d3844c91 <c2a97703359e25ec7ef8b2b0ef32fb3982add90a
  5. Affected versionversion=cf4441503e20a0c0a36e0a98dcf57de3d3844c91 <e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=cf4441503e20a0c0a36e0a98dcf57de3d3844c91 <65cb86860a80ffc6af897d53f5bd4b1733bca0ec; version=cf4441503e20a0c0a36e0a98dcf57de3d3844c91 <b7f925fd5226deb953c8dcdc9677d3fcc2717c00; version=cf4441503e20a0c0a36e0a98dcf57de3d3844c91 <c2a97703359e25ec7ef8b2b0ef32fb3982add90a; version=cf4441503e20a0c0a36e0a98dcf57de3d3844c91 <e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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