netfs: Fix netfs_read_to_pagecache() to pause on subreq failure (CVE-2026-64066) | HOL Guard CVE

Critical · CVSS 9.8CVE-2026-64066

netfs: Fix netfs_read_to_pagecache() to pause on subreq failure

Answer in brief

CVE-2026-64066 records a Critical severity (CVSS 9.8) vulnerability in netfs: Fix netfs_read_to_pagecache() to pause on subreq failure. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 19, 2026Updated Sep 3, 2026Source checked Sep 21, 2026First seen by HOL Aug 5, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 7 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc1::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc2::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc3::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc4::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8 \|\| >=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <0256e79ce42101ad036edd4205bccca621ea0927 \|\| >=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4	884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8, 0256e79ce42101ad036edd4205bccca621ea0927, 8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4
Linux/Linuxgeneric	6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix netfs_read_to_pagecache() to pause on subreq failure Fix netfs_read_to_pagecache() so that it pauses the generation of new subrequests if an already-issued subrequest fails.

Quoted source text, attributed separately from HOL analysis.