VulnerabilityPublished 18 Oct 2026

CVE-2026-98728: Linux kernel · tpm: fix off-by-four bounds check in tpm2_get_random()

Source GCVE Database

Authoritative record:CVE-2026-98728· Low

Not known to be exploited · fixed in e30a2406408d2df6d9cd48c2e59e913cf266a05a : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Low

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e30a2406408d2df6d9cd48c2e59e913cf266a05a, be54101992c2c5218be0e0a87827ccc96e3089af, 42bb6216b861e892512128219ff23010d656ba14 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 18 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-m4p2-cqr5-x7cx

What to do

Upgrade Linux kernel to e30a2406408d2df6d9cd48c2e59e913cf266a05a, be54101992c2c5218be0e0a87827ccc96e3089af, 42bb6216b861e892512128219ff23010d656ba14 or 9b522400bf5c082feb9a0037a053ea822a2c7e4d.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497, < e30a2406408d2df6d9cd48c2e59e913cf266a05a	Fixed in e30a2406408d2df6d9cd48c2e59e913cf266a05a
LinuxLinux	Affected ≥ 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497, < be54101992c2c5218be0e0a87827ccc96e3089af	Fixed in be54101992c2c5218be0e0a87827ccc96e3089af
LinuxLinux	Affected ≥ 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497, < 42bb6216b861e892512128219ff23010d656ba14	Fixed in 42bb6216b861e892512128219ff23010d656ba14
LinuxLinux	Affected ≥ 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497, < 9b522400bf5c082feb9a0037a053ea822a2c7e4d	Fixed in 9b522400bf5c082feb9a0037a053ea822a2c7e4d
LinuxLinux	Affected =6.10	Fixed in–
Linuxlinux/kernel`pkg:rpm/linux/kernel`Other threats	Affected =6.10	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel to correct the bounds check in tpm2_get_random(). Users should apply the official kernel update containing this patch when it becomes available. Patch status is not explicitly confirmed in the provided data; check the vendor advisory for current remediation guidance.

Description

A bounds check off-by-four vulnerability in the Linux kernel's tpm2_get_random() function was fixed. The flaw allowed memcpy() to read up to 4 bytes beyond the end of a truncated TPM response, potentially leaking stale buffer contents as random data. The issue was addressed by correcting the length check to account for the skipped parameter size field in the response.

References

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