CVE-2026-98221

Kernel out-of-bounds read via wrong blob length

Published Oct 6, 2026 · Updated Oct 6, 2026

Out-of-bounds read in Linux 5.13 and later allows local users to trigger a kernel buffer overread via a crafted TPM2 trusted-key blob. The tpm2_load_cmd() function checks lengths within the decoded key against the larger ASN.1 payload length instead of the decoded buffer length. The path requires TPM-backed trusted keys and a local key-loading request; the published patch does not establish data disclosure or a host crash.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux 5.13 and later allows local users to trigger a kernel buffer overread via a crafted TPM2 trusted-key blob. The tpm2_load_cmd() function checks lengths within the decoded key against the larger ASN.1 payload length instead of the decoded buffer length. The path requires TPM-backed trusted keys and a local key-loading request; the published patch does not establish data disclosure or a host crash.

The record

CVE
CVE-2026-98221
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.13
  2. Affected versionversion=f2219745250f388edacabe6cca73654131c67d0a <114f00d738f15dd8c7318369edcdc53dd6d08763
  3. Affected versionversion=f2219745250f388edacabe6cca73654131c67d0a <134825dfc971fbf2b1d0f58f0b3bce8332ad0afb
  4. Affected versionversion=f2219745250f388edacabe6cca73654131c67d0a <3fd487c69ad3161e358c33c170bab0cf02a071b7
  5. Affected versionversion=f2219745250f388edacabe6cca73654131c67d0a <5afa57ea91481c6c49f194b0f5a5c4d96a4d7348
  6. Affected versionversion=f2219745250f388edacabe6cca73654131c67d0a <9ddbc5f4bb498aff8096a5231574858a4bffee4f
  7. Affected versionversion=f2219745250f388edacabe6cca73654131c67d0a <b020b447338872440142fe8a57350a483da86b7a
  8. Affected versionversion=f2219745250f388edacabe6cca73654131c67d0a <cc86227fea28aed86c1fb52a884560b4440da198

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=f2219745250f388edacabe6cca73654131c67d0a <114f00d738f15dd8c7318369edcdc53dd6d08763; version=f2219745250f388edacabe6cca73654131c67d0a <134825dfc971fbf2b1d0f58f0b3bce8332ad0afb; version=f2219745250f388edacabe6cca73654131c67d0a <3fd487c69ad3161e358c33c170bab0cf02a071b7; version=f2219745250f388edacabe6cca73654131c67d0a <5afa57ea91481c6c49f194b0f5a5c4d96a4d7348; version=f2219745250f388edacabe6cca73654131c67d0a <9ddbc5f4bb498aff8096a5231574858a4bffee4f; version=f2219745250f388edacabe6cca73654131c67d0a <b020b447338872440142fe8a57350a483da86b7a; version=f2219745250f388edacabe6cca73654131c67d0a <cc86227fea28aed86c1fb52a884560b4440da198

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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