CVE-2026-64296

Kernel memory disclosure and corruption via exFAT fragments

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds memory access in the Linux Kernel exFAT driver allows local users to read and corrupt kernel memory via a crafted image. In exfat_find_dir_entry(), each short TYPE_EXTEND fragment advances uniname by 15 characters while the guard counts only the shorter extracted length, moving reads and writes beyond p_uniname->name. The image must be mounted and traversed through pathname operations; low-privileged local access is sufficient where a storage broker permits loop-backed image mounts.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds memory access in the Linux Kernel exFAT driver allows local users to read and corrupt kernel memory via a crafted image. In exfat_find_dir_entry(), each short TYPE_EXTEND fragment advances uniname by 15 characters while the guard counts only the shorter extracted length, moving reads and writes beyond p_uniname->name. The image must be mounted and traversed through pathname operations; low-privileged local access is sufficient where a storage broker permits loop-backed image mounts.

The record

CVE
CVE-2026-64296
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.7
  2. Affected versionversion=ca06197382bde0a3bc20215595d1c9ce20c6e341 <33c0b96d7e1672be1de0053786637ea46fb81507
  3. Affected versionversion=ca06197382bde0a3bc20215595d1c9ce20c6e341 <3a1230e7b043c62737b05a3e9275ca83a43ad20a
  4. Affected versionversion=ca06197382bde0a3bc20215595d1c9ce20c6e341 <727bf7783a2936ffd55c628dddfd69343e511dcf
  5. Affected versionversion=ca06197382bde0a3bc20215595d1c9ce20c6e341 <72a2589d82eb001c94b74bcfe6f9a599bd9bef60
  6. Affected versionversion=ca06197382bde0a3bc20215595d1c9ce20c6e341 <c8e041c68c0bbb73aa62371ee63947bb6949d8b2
  7. Affected versionversion=ca06197382bde0a3bc20215595d1c9ce20c6e341 <ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0
  8. Affected versionversion=ca06197382bde0a3bc20215595d1c9ce20c6e341 <cf85180b8a015029ee147694eaf4e0b3537e9432
  9. Affected versionversion=ca06197382bde0a3bc20215595d1c9ce20c6e341 <fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.7; version=ca06197382bde0a3bc20215595d1c9ce20c6e341 <33c0b96d7e1672be1de0053786637ea46fb81507; version=ca06197382bde0a3bc20215595d1c9ce20c6e341 <3a1230e7b043c62737b05a3e9275ca83a43ad20a; version=ca06197382bde0a3bc20215595d1c9ce20c6e341 <727bf7783a2936ffd55c628dddfd69343e511dcf; version=ca06197382bde0a3bc20215595d1c9ce20c6e341 <72a2589d82eb001c94b74bcfe6f9a599bd9bef60; version=ca06197382bde0a3bc20215595d1c9ce20c6e341 <c8e041c68c0bbb73aa62371ee63947bb6949d8b2; version=ca06197382bde0a3bc20215595d1c9ce20c6e341 <ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0; version=ca06197382bde0a3bc20215595d1c9ce20c6e341 <cf85180b8a015029ee147694eaf4e0b3537e9432; version=ca06197382bde0a3bc20215595d1c9ce20c6e341 <fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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