CVE-2026-64298: NFSv4: include MAY_WRITE in open permission mask for O_TRUNC

Q: What is the severity of CVE-2026-64298?

CVE-2026-64298 has a severity rating of 7.8, classified as high.

Q: How do I fix CVE-2026-64298?

To fix CVE-2026-64298, apply the available patches as recommended in the Linux kernel update.

Q: What does CVE-2026-64298 affect?

CVE-2026-64298 affects the NFSv4 implementation in the Linux kernel and Microsoft azl3 kernel.

Q: What is the risk associated with CVE-2026-64298?

The risk associated with CVE-2026-64298 is categorized as high, with a risk score of 69.

Q: What kind of permission does CVE-2026-64298 involve?

CVE-2026-64298 involves truncating files and the associated write permissions required by POSIX.

Published Jul 25, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved:

NFSv4: include MAYWRITE in open permission mask for OTRUNC

POSIX requires write permission to truncate a file, so an open() that specifies OTRUNC must be authorized for write access regardless of the OACCMODE access mode.

nfsopenpermissionmask() builds the access mask passed to nfsmayopen(), which is the local authorization gate for OPENs the client serves itself from a cached write delegation via the canopendelegated() path in nfs4tryopencached(). The mask is derived from OACCMODE alone, so an open(ORDONLY | OTRUNC) against a file the caller cannot write requests only MAYREAD and passes the local check. The OPEN is then satisfied locally and the truncation is issued to the server as a SETATTR(size=0) over the delegation stateid, which the server accepts under standard write-delegation semantics. POSIX requires that this open fail with EACCES.

Include MAYWRITE in the mask whenever OTRUNC is set so the local check matches the access the server would have enforced.

Affected Software

265 affected componentsFixes available

Linux Linux kernel

Microsoft azl3 kernel 6.6.144.1-1<6.6.145.2-1

6.6.145.2-1

Linux Linux kernel>=2.6.24<5.10.261

Linux Linux kernel>=5.11<5.15.212

Linux Linux kernel>=5.16<6.1.178

Linux Linux kernel>=6.2<6.6.145

Linux Linux kernel>=6.7<6.12.96

Linux Linux kernel>=6.13<6.18.39

Linux Linux kernel>=6.19<7.1.4

Linux Linux kernel=7.2-rc1

Linux Linux kernel=7.2-rc2

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ubuntu/linux-gcp*

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ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

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ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4*

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ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

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ubuntu/linux-lowlatency<5.15.0-195.205

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ubuntu/linux-riscv-5.19*

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ubuntu/linux-starfive-5.19*

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ubuntu/linux-xilinx-zynqmp<5.15.0-1080.84

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5.15.0-1109.111

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ubuntu/linux-nvidia-bos<7.0.0-2018.18

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7.0.0-1013.13

ubuntu/linux-oracle<7.0.0-1011.11

7.0.0-1011.11

ubuntu/linux-raspi<7.0.0-1019.19

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7.0.0-31.31.1

ubuntu/linux-riscv<7.0.0-31.31.1

7.0.0-31.31.1

Remediation

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Fixed in 7.0.0-31.31.1
Upgrade
Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.
Fixed in 7.0.0-31.31.1

Event History

Jul 25, 2026

CVE Published

via MITRE·08:49 AM

Data Sourced

via MITRE·08:49 AM

DescriptionSeverity

Data Sourced

via Red Hat·10:10 AM

DescriptionSeverityAffected Software

Data Sourced

via OSV·10:17 AM

DescriptionSeverityAffected Software

Data Sourced

via NVD·10:17 AM

RemedyDescriptionSeverityWeaknessAffected Software

Jul 26, 2026

Data Sourced

via Microsoft·08:02 AM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-64298?

CVE-2026-64298 has a severity rating of 7.8, classified as high.

How do I fix CVE-2026-64298?

To fix CVE-2026-64298, apply the available patches as recommended in the Linux kernel update.

What does CVE-2026-64298 affect?

CVE-2026-64298 affects the NFSv4 implementation in the Linux kernel and Microsoft azl3 kernel.

What is the risk associated with CVE-2026-64298?

The risk associated with CVE-2026-64298 is categorized as high, with a risk score of 69.

What kind of permission does CVE-2026-64298 involve?

CVE-2026-64298 involves truncating files and the associated write permissions required by POSIX.

CVE-2026-64298: NFSv4: include MAY_WRITE in open permission mask for O_TRUNC

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2026-64298?

How do I fix CVE-2026-64298?

What does CVE-2026-64298 affect?

What is the risk associated with CVE-2026-64298?

What kind of permission does CVE-2026-64298 involve?

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