VulnerabilityPublished 26 Oct 2026

CVE-2026-99097: Linux kernel · tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()

Source GCVE Database

Authoritative record:CVE-2026-99097· High

Not known to be exploited · fixed in e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d : patch Linux kernel soon.

Data as of 26 Oct 2026, 16:31 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d, c2a97703359e25ec7ef8b2b0ef32fb3982add90a, b7f925fd5226deb953c8dcdc9677d3fcc2717c00 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-6fpw-5chx-rgh9

What to do

Upgrade Linux kernel to e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d, c2a97703359e25ec7ef8b2b0ef32fb3982add90a, b7f925fd5226deb953c8dcdc9677d3fcc2717c00 or 65cb86860a80ffc6af897d53f5bd4b1733bca0ec.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ cf4441503e20a0c0a36e0a98dcf57de3d3844c91, < e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d	Fixed in e5dc7af9c3a5373ee7a84959126e7dfa9e4ad50d
LinuxLinux	Affected ≥ cf4441503e20a0c0a36e0a98dcf57de3d3844c91, < c2a97703359e25ec7ef8b2b0ef32fb3982add90a	Fixed in c2a97703359e25ec7ef8b2b0ef32fb3982add90a
LinuxLinux	Affected ≥ cf4441503e20a0c0a36e0a98dcf57de3d3844c91, < b7f925fd5226deb953c8dcdc9677d3fcc2717c00	Fixed in b7f925fd5226deb953c8dcdc9677d3fcc2717c00
LinuxLinux	Affected ≥ cf4441503e20a0c0a36e0a98dcf57de3d3844c91, < 65cb86860a80ffc6af897d53f5bd4b1733bca0ec	Fixed in 65cb86860a80ffc6af897d53f5bd4b1733bca0ec
LinuxLinux	Affected =6.10	Fixed in–

AI-suggested

A fix has been implemented to reject zero-sized allocations in tee_dyn_shm_alloc_helper(). Users should apply the official kernel updates that include this fix. No additional mitigation steps are required if the system is updated. If the system is not yet patched, avoid triggering TEE_IOC_SHM_ALLOC with zero size parameters.

Description

A vulnerability in the Linux kernel's TEE subsystem allows zero-sized shared memory allocations via tee_dyn_shm_alloc_helper(). This leads to an invalid call to the page allocator, causing allocation failure and potentially a kernel panic during boot on systems with panic_on_warn enabled. The flaw is triggered by TEE_IOC_SHM_ALLOC with a zero size parameter. The issue has been resolved by rejecting zero-sized allocations.

References

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