netfs: Fix missing locking around retry adding new subreqs (CVE-2026-64068) | HOL Guard CVE

Critical · CVSS 9.8CVE-2026-64068

netfs: Fix missing locking around retry adding new subreqs

Answer in brief

CVE-2026-64068 records a Critical severity (CVSS 9.8) vulnerability in netfs: Fix missing locking around retry adding new subreqs. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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 7, 2026Source checked Sep 20, 2026First seen by HOL Aug 5, 2026Material review Sep 7, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 8 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), 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	>=288ace2f57c9d06dd2e42bd80d03747d879a4068 <393f3f0d7353a94b1e0bc4ca89c683fe983e5fd2 \|\| >=288ace2f57c9d06dd2e42bd80d03747d879a4068 <cce18c263e9623872327ba3c956012f73c1179cc	393f3f0d7353a94b1e0bc4ca89c683fe983e5fd2, cce18c263e9623872327ba3c956012f73c1179cc
Linux/Linuxgeneric	6.10	Not reported
Linux/Linuxgeneric	>=288ace2f57c9d06dd2e42bd80d03747d879a4068 <d5c9d19b0ff2f7153532ac238a5e96fed2df315c \|\| >=288ace2f57c9d06dd2e42bd80d03747d879a4068 <393f3f0d7353a94b1e0bc4ca89c683fe983e5fd2 \|\| >=288ace2f57c9d06dd2e42bd80d03747d879a4068 <cce18c263e9623872327ba3c956012f73c1179cc	d5c9d19b0ff2f7153532ac238a5e96fed2df315c, 393f3f0d7353a94b1e0bc4ca89c683fe983e5fd2, cce18c263e9623872327ba3c956012f73c1179cc

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 393f3f0d7353a94b1e0bc4ca89c683fe983e5fd2; Linux/Linux to d5c9d19b0ff2f7153532ac238a5e96fed2df315c 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 7, 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 missing locking around retry adding new subreqs Fix netfs_retry_read_subrequests() and netfs_retry_write_stream() to take the appropriate lock when adding extra subrequests into stream->subrequests.

Quoted source text, attributed separately from HOL analysis.