VulnerabilityPublished 13 Jan 2026Updated 19 Oct 2026

CVE-2025-71077: Linux kernel · tpm: Cap the number of PCR banks

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in faf07e611dfa464b201223a7253e9dc5ee0f3c9e : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS

0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-06-10.

Patch

Available – fixed in faf07e611dfa464b201223a7253e9dc5ee0f3c9e, d88481653d74d622d1d0d2c9bad845fc2cc6fd23, ceb70d31da5671d298bad94ae6c20e4bbb800f96 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 13 Jan 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ bcfff8384f6c4e6627676ef07ccad9cfacd67849, < faf07e611dfa464b201223a7253e9dc5ee0f3c9e	Fixed in faf07e611dfa464b201223a7253e9dc5ee0f3c9e
LinuxLinux	Affected ≥ bcfff8384f6c4e6627676ef07ccad9cfacd67849, < d88481653d74d622d1d0d2c9bad845fc2cc6fd23	Fixed in d88481653d74d622d1d0d2c9bad845fc2cc6fd23
LinuxLinux	Affected ≥ bcfff8384f6c4e6627676ef07ccad9cfacd67849, < ceb70d31da5671d298bad94ae6c20e4bbb800f96	Fixed in ceb70d31da5671d298bad94ae6c20e4bbb800f96
LinuxLinux	Affected ≥ bcfff8384f6c4e6627676ef07ccad9cfacd67849, < b69492161c056d36789aee42a87a33c18c8ed5e1	Fixed in b69492161c056d36789aee42a87a33c18c8ed5e1
LinuxLinux	Affected ≥ bcfff8384f6c4e6627676ef07ccad9cfacd67849, < 858344bc9210bea9ab2bdc7e9e331ba84c164e50	Fixed in 858344bc9210bea9ab2bdc7e9e331ba84c164e50
LinuxLinux	Affected ≥ bcfff8384f6c4e6627676ef07ccad9cfacd67849, < 275c686f1e3cc056ec66c764489ec1fe1e51b950	Fixed in 275c686f1e3cc056ec66c764489ec1fe1e51b950

Description

In the Linux kernel, the following vulnerability has been resolved: tpm: Cap the number of PCR banks tpm2_get_pcr_allocation() does not cap any upper limit for the number of banks. Cap the limit to eight banks so that out of bounds values coming from external I/O cause on only limited harm.

CWE-20Improper Input Validation (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #18OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design · Attack Surface Reduction
Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build "recognizers" for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of…
Architecture and Design · Libraries or Frameworks
Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
Injection Prevention (opens in a new tab)
SQL Injection Prevention (opens in a new tab)
Injection Prevention in Java (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Buffer Overflow via Environment Variables (opens in a new tab)
Server Side Include (SSI) Injection (opens in a new tab)
Cross Zone Scripting (opens in a new tab)
Command Line Execution through SQL Injection (opens in a new tab)
Object Relational Mapping Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

WeaknessesCWE-20

Technical details

References

Community reviews

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