CVE-2026-31694: In the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page ca

Q: How do I fix CVE-2026-31694?

linux kernel: upgrade to 6.18.25, 7.0.2; simatic s7-1500 tm mfp firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-31694 being exploited?

CVE-2026-31694 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-31694 affect?

CVE-2026-31694 affects linux kernel, simatic s7-1500 tm mfp firmware. Severity is high (CVSS 7.8). In the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page cache fuse_add_dirent_to_cache() computes a serialized dirent size from the server-controlled namelen field and copies the dirent i

Q: How urgent is CVE-2026-31694?

Priority 34/100. High severity; On your watchlist

Routine

HIGH 7.8WATCHLISTUPGRADEMITIGATE

CVE-2026-31694 is a high-severity flaw (CVSS 7.8) affecting linux kernel, simatic s7-1500 tm mfp firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page cache fuse_add_dirent_to_cache() computes a serialized dirent size from the server-controlled namelen field and copies the dirent into a single page-cache page. The existing logic only checks whether the dirent fits in the remaining space of the current page and advances to a fresh page if not. It never checks whether the dirent itself exc

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Published	2026-05-01
Last modified	2026-10-23

Publisher (CNA): kernel.org · Vendor: linux · siemens

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-01 14:16 UTCPublished CVE record published
2026-10-23 14:06 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 6.15 and < 6.18.25 · >= 6.19 and < 7.0.2 · 7.1 rc1 · 7.1 rc2

Fixed in: 6.18.25, 7.0.2

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

siemens simatic s7-1500 tm mfp firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Debian 12 · linux · NOT AFFECTED

Debian 13 · linux · NOT AFFECTED

RHEL 10 · kernel · NOT AFFECTED

RHEL 6 · kernel · NOT AFFECTED

RHEL 7 · kernel · NOT AFFECTED

RHEL 7 · kernel-rt · NOT AFFECTED

RHEL 8 · kernel · NOT AFFECTED

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1817 · source

sudo dnf update --advisory=ALAS2023-2026-1817

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-31694?

linux kernel: upgrade to 6.18.25, 7.0.2; simatic s7-1500 tm mfp firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-31694 being exploited?

CVE-2026-31694 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-31694 affect?

CVE-2026-31694 affects linux kernel, simatic s7-1500 tm mfp firmware. Severity is high (CVSS 7.8). In the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page cache fuse_add_dirent_to_cache() computes a serialized dirent size from the server-controlled namelen field and copies the dirent i

How urgent is CVE-2026-31694?

Priority 34/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities · Siemens vulnerabilities

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References

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