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Response snapshot Oct 28, 2026, 17:11 UTC

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VulnerabilityCVE-2026-98117

Linux kernel: cachefiles: Fix potential UAF/KASAN warning

In the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix potential UAF/KASAN warning Currently, trace_cachefiles_coherency() is being passed a pointer to a __be64 lain over the coherency data in struct cachefiles_xattr so that it can display the first 8 bytes.

At a glance

Exploited
Not known
Severity
7.8 High (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-98117 (opens a new tab)

What happened

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

cachefiles: Fix potential UAF/KASAN warning

Currently, trace_cachefiles_coherency() is being passed a pointer to a __be64 lain over the coherency data in struct cachefiles_xattr so that it can display the first 8 bytes. However, the data is of variable length and could even be 0 bytes. This could lead to a UAF or KASAN warning.

Fix this by making sure the buffer has room for at least 8 bytes and that those 8 bytes are pre-cleared.

Continue reading

Further, those bytes are not 8-byte aligned, so fix the tracepoint to extract the data as four 2-byte words (they are 2-byte aligned) and reassemble the __be64. The compiler will convert this into a single 8-byte load where the CPU supports it.

Scores and how they were measured

CVSS base severity

7.8

Version 3.1As of

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    NVD CVE-2026-98117 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). Linux kernel: cachefiles: Fix potential UAF/KASAN warning (CVE-2026-98117). https://kevwire.com/record/CVE-2026-98117

MLA

"Linux kernel: cachefiles: Fix potential UAF/KASAN warning (CVE-2026-98117)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-98117.

Chicago

KEVWire. "Linux kernel: cachefiles: Fix potential UAF/KASAN warning (CVE-2026-98117)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-98117.

Evidence summary (plain text)

Linux kernel: cachefiles: Fix potential UAF/KASAN warning (Sep 25, 2026).
In the Linux kernel, the following vulnerability has been resolved:

cachefiles: Fix potential UAF/KASAN warning

Currently, trace_cachefiles_coherency() is being passed a pointer to a
__be64 lain over the coherency data in struct cachefiles_xattr so that it
can display the first 8 bytes.  However, the data is of variable length and
could even be 0 bytes.  This could lead to a UAF or KASAN warning.

Fix this by making sure the buffer has room for at least 8 bytes and that
those 8 bytes are pre-cleared.
CVSS 7.8 (version 3.1; evidence as of Oct 28, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-98117).
Sources:
NVD CVE-2026-98117: https://nvd.nist.gov/vuln/detail/CVE-2026-98117
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T15:41:02.957Z&lastModEndDate=2026-10-28T17:10:56.768Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T15:10:58.350Z&lastModEndDate=2026-10-28T16:40:56.161Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-28T14:31:18.089Z&lastModEndDate=2026-10-28T16:10:57.523Z&resultsPerPage=500&startIndex=0
Record ID: CVE-2026-98117.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 28, 2026, 17:10 UTC. Ingestion is not an independent editorial investigation.

NVD status: Analyzed. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

Record detail